Tweel Airless Tires

Tweel Airless Tires

Can you imagine a driving experience where getting a flat tire was never a concern? It may sound too good to be true, but the engineers at Michelin have been working on that very dream since 2005. Tweel Airless Tires are a combination tire-wheel (hence the name) that relies on a whole new construction, eliminating air pressure altogether. So, how does it work exactly? And why the heck can’t we buy it right now!?

Michelin Tweel Airless Tire In Action Photo credit :

Michelin Tweel Airless Tire In Action
Photo credit :

The construction of the Tweel airless tire is relatively simple. At the center is a deformable hub that connects to the vehicle itself. The hub is surrounded by a series of flexible polyurethane spokes, which support an outer shear band, covered by conventional rubber tire tread. The tread itself can be designed just like it is today in pneumatic tires, and is replaceable when worn. The flexible spokes absorb shock in the same way that air absorbs shock within a typical tire, and the hub is able to flex under various loads and spring back to its original shape. The spokes can be made with a wide range of stiffness, offering many different handling and load capabilities.

Michelin Tweel Airless Tire Cutaway Photo credit:

Michelin Tweel Airless Tire Cutaway
Photo credit:

The benefits of this construction are numerous! There is the obvious elimination of tire punctures and/or blowouts; this makes tires safer, less expensive, and much longer lasting. Michelin has also claimed the tread itself will last 2-3 times longer than normal tire rubber, and falls within 5% of rolling resistance of its pneumatic tires (this means it’s within a 1% range of fuel efficiency of regular tires). In terms of handling, Tweel Airless Tires offer a unique advantage – in normal tires, a more cushiony ride leads to a decrease in handling (and vice versa), since both ride quality and handling are related to the air pressure and sidewall stiffness within the tire. With a Tweel Airless Tire, these aspects can be controlled independently of one another. This means the flexible spokes offer a cushiony, flexible ride, while the lateral stiffness (and overall handling abilities) can be tuned separately. The combination of producing less waste and eliminating the driver’s need to help fuel efficiency through air pressure monitoring make the Tweel airless tire much more environmentally friendly, too.

There are some downsides, unfortunately. The most notable issue preventing its mass marketing is heavy vibration above 50 mph. This leads to unpleasant noise levels and excessive heat production. While these are issues that will surely be fixed over time by Michelin engineers, there exists another problem largely out of their control – the tire and auto industries as a whole. There are literally thousands of tire factories, auto shops, dealers, auto makers, etc. that would have to change their business models entirely to accommodate such a radical shift. In terms of marketing, equipment, technical training, and development, it almost seems impossible. Of course it is not impossible, but experts agree that it will be quite some time before the Tweel airless tire is available to passenger vehicles and consumers in the common marketplace.

There are some current applications for this cool technology, though. Various construction and military vehicles are already taking advantage of the Tweel airless tire. Since they’re not high-speed vehicles, they don’t run into the excessive noise and heat problems that standard passenger vehicles do. Tweel airless tires have also been showcased on the Segway Centaur (an ATV 4-wheeler) and the iBot (a mobility vehicle for the physically impaired).

Tweel Airless Tire In A Commercial Application photo credit:

Tweel Airless Tire In A Commercial Application
photo credit:

This is an exciting technology to watch develop, and will surely revolutionize the tire industry as a whole. While we’re just as excited as the next person to see these tire alternatives hit the stores, just remember – patience is a virtue, and good things come to those who wait.

In the meantime, check out AutoSquad for all your regular tire needs! Contact us at 855-484-3778, or visit to see our tire selection and make an appointment online. Please note that AutoSquad’s service is currently available in the Washington, DC metro area only. 

Low Rolling Resistance Tires-Are They Worth It?

Low Rolling Resistance Tires – Worth it, or just hype?

Today I will discuss low rolling resistance tires. The U.S Department of Energy says that anywhere from 5%-15% of fuel economy is used to overcome rolling resistance (defined as the force resisting the motion when a tire rolls on a surface).  That’s a considerable amount of fuel to spend on your tires, and with the cost of fuel today, that adds up!  I’ll discuss low rolling resistance tires, as well as some information about how to increase your fuel economy with your tires.

low rolling resistance tires, michelin energy saver as, fuel economy, LRR, low rolling, resistance

Michelin Energy Saver AS

Corporate Average Fuel Economy (CAFE):

Congress introduced CAFE standards in 1975 with the intent of reducing energy consumption by increasing the fuel economy of light trucks and passenger cars.  The National Highway Traffic Safety Administration, or NHTSA, set standards to increase CAFE levels in the upcoming years.  Their reasoning behind this is that it will improve our nation’s energy security, and at the same time it will save the average consumer money at the pump.  In 2012, NHTSA and the U.S. Environmental Protection Agency (EPA) issued a final ruling extending the CAFE standards for vehicles for model years 2017-2025.  NHTSA estimates that that those standards will save around 4 billion barrels of oil and 1.8 billion metric tons of CO2 emissions over the lifetimes of 2017-2025 model year vehicles.  NHTSA estimates that the increased cost of purchasing a vehicle will be offset by the savings in fuel economy.  The new standards put forth will almost double the current fuel efficiency of vehicles, with a MPG of 54.5.  This is huge! NHTSA compares the savings gained through fuel efficiency to be as comparable to lowering the price of gasoline by $1 per gallon in 2025.

What This Means for Us:

Rolling resistance is defined as the force resisting the motion when a tire rolls on a surface.  While future vehicles will be held to this high standard, current vehicles have already been upgraded with better fuel efficiency.  With the recent trend of hybrid vehicles becoming popular, most vehicle manufacturers are looking for ways to increase fuel efficiency even more.  One way to increase fuel efficiency is to install Low Rolling Resistance (LRR) tires.  Low rolling resistance tires are said to increase your fuel economy over the life of the tire, resulting in less money being spent at the pump.  For example, Goodyear claims that their Assurance Fuel Max tire reduces rolling resistance by up to 27%, resulting in saving up to 2,600 miles worth of gas over the life of 4 tires.  This would be about a 4% improvement in fuel economy.  Michelin claims that their Energy Saver A/S tire can save up to $400 in gas over the life of 4 tires, and that your tires will last up to 16,000 miles longer than a leading competitor’s tires.  As more fuel efficient vehicles are produced, and as auto manufacturers continue to meet higher fuel economy standards, it is becoming more and more likely that your vehicle will come standard with a low rolling resistance tire.

Are Low Rolling Resistance Tires Worth It?

As more vehicles come standard with low rolling resistance tires, and as low rolling resistance tires become more prevalent with tire makers, the question becomes “Are they really worth it?” For the most part, LRR tires are slightly more expensive than non-LRR tires.  This is a result of more technology being put into the tires.  The problem with LRR tires is that there is no federal standard or minimum requirement to carry that title.  So, when a tire manufacturer claims that it will increase your fuel economy by 4%, they are comparing that figure to their own tires.  In fact, a tire manufacturer could claim their tire is LRR, when in reality it could just be an upgraded model of their previous tire.  The goal of LRR tires is to help vehicles meet CAFÉ standards; as long as vehicles do that on their own without the help of their tires, there won’t be additional requirements for tires themselves. Without a standard benchmark for these tires, it’s up to the consumer to do their homework when searching for this type of tire.

The other downfall to low rolling resistance tires is they don’t have as good traction, so they may require a greater stopping distance.  Like I mentioned earlier, since rolling resistance is defined as the force resisting the motion when a tire rolls on a surface, low rolling resistance tires are designed to have less resistance.  The obvious tradeoff is that, while you will get better fuel economy, the tires will have a lower traction rating.  This problem is somewhat justified, as the whole reason behind low rolling resistance tires is to decrease the traction with the road.  Thankfully, with the future geared towards better fuel economy, most tire manufacturers are trying to offset the lower traction ratings on low rolling resistance tires.  While the current state of low rolling resistance tires may not give you the best in traction, I’m confident that this will improve over time.  Vehicle manufacturers will have to have the best fuel economy possible, and will count on low rolling resistance tires to help them meet the very high CAFE standards put forth by The Obama Administration.

Tips to Increase Fuel Economy:

Outside of purchasing low rolling resistance tires, there are a few ways you can increase your fuel economy with your current tires.  The easiest way to do this is by keeping your tires inflated to the correct air pressure.  If your tires’ air pressure is too low, your tires won’t perform as they are designed to.  This will result in a big decrease in fuel economy.  Another somewhat obvious tip is to not drive so fast! The slower you go the better fuel economy you have, so try to stick to the speed limit and your fuel economy will improve. This tip goes hand in hand with driving at a constant speed.  Accelerating rapidly will use up more gas than if you were to slowly accelerate up to speed.  Using cruise control will help you maintain a constant speed. And perhaps the most obvious tip is to search for the lowest priced gas station! There are tons of mobile phone apps that are updated in real time and will give you the lowest price of fuel around.

Contact AutoSquad at 855-484-3778, or visit to see our tire selection and make an appointment online, or ask any questions about low rolling resistance tires. Please note that AutoSquad’s service is currently available in the Washington, DC metro area only. 

Bridgestone 2013 Tire Rebate Offer

Bridgestone 2013 TIRE REBATE OFFER

Bridgestone Tires, Bridgestone Rebate, Bridgestone PromotionBuy a set of 4 Bridgestone Tires between April 1 – April 30, 2013 and receive a $70 pre-paid AmEx card  through this mail-in rebate offer. Visit AutoSquad’s website for more information or to download the rebate form.

Eligible Tires for a $70 Mail-In Rebate:

Bridgestone Dueler H/L 422 Ecopia
Bridgestone Ecopia EP422
Bridgestone Turanza Serenity Plus
Bridgestone Dueler A/T Revo 2
Bridgestone Dueler H/P Sport AS
Bridgestone Potenza RE97AS

Hankook 2013 Tire Rebate Offer


Hankook Tires, Hankook Rebate, Hankook PromotionBuy a set of 4 Hankook Tires from AutoSquad between April 1 – June 30, 2013 and receive up to $80 back in the form of a pre-paid AmEx card through this mail-in rebate offer. Visit AutoSquad’s website for more details or to download the rebate form.  

Eligible for a $50 Mail-In Rebate:
Hankook Optimo H727
Hankook Dynapro HT

Eligible for a $60 Mail-In Rebate:
Hankook Ventus S1 noble2

Eligible for an $80 Mail-In Rebate:
Hankook Ventus V12 evo

Ford F150 Tires | F250 Tires | F350 Tires

Ford F150 tires, F250 tires, & F350 tires (2010) – best replacement tire options and recommendations, by driving preferences.

Ford F150 tires

2010 Ford F150 XL Regular Cab

If you own a 2010 Ford F150, F250, or F350 truck, you’re certainly not alone! Just like in 2009, this iconic vehicle made its way to the #1 best-selling spot in America, with over 500,000 models sold (according to For over six decades, the F-Series truck has been a staple both on and off the road, but we all know a vehicle is only good as its tires. With over 22 sub-models, endless customization options, and too many tire + wheel packages to comprehend, we’ll recommend some common, highly rated Ford F150 tires (and F250 + F350 tires) that will likely fit most, if not all, models of this truck.

If you stick to main roads, highways, make local trips or commute, a standard highway all-season tire will be your best option. Among the most popular Ford F150 tires in this category are the Michelin LTX M/S2 (70,000 miles), Michelin Latitude Tour (65,000 miles), and Continental CrossContactLX20 EcoPlus (70,000 miles). A popular consumer magazine rated these highest for overall handling, ride comfort, tread wear, and fuel economy.  Coming in just below those, we love the General Grabber HTS (60,000 miles) and Nokian WR G2 SUV (50,000 miles). While still highly rated for handling, low noise, and good fuel economy, they are ever-so-slightly lower on tread life. While these tires are quiet on the road, don’t let that fool you – they are silently working hard to keep you safe and handle all sorts of weather conditions, unexpected stoppages, and all of life’s twists and turns.  On top of that, they all have low rolling resistance, which is a fuel efficient technology built into the tire. This cuts down on overall fuel consumption and carbon emissions. Let’s face it – there’s nothing better these days than saving money on gas when you’re buying Ford F150 tires!

If you’re more of an adventure-seeker and spend a decent amount of time off-road in your truck, you should probably go with an all-terrain tire. Not only do they allow you to tackle a rougher terrain, but they have a much more aggressive tread design, which many enthusiasts like for aesthetic reasons. While they aren’t known for their ride comfort, they do let you wander off the beaten path without having to leave your vehicle behind. A popular consumer magazine rated the Cooper Discoverer A/T 3 (55,000 miles) as the #1 off-road tire, with terrific snow traction. The Michelin LTX A/T2 (60,000 miles) is another great option, known for exceptional tread life and handling. The Kumho Road Venture SAT KL61 (60,000 miles) receives some of the best marks for wet traction and reduced noise.

If you do the majority of your driving on pavement but are looking for Ford F150 tires that gives a little extra oomph, the BFGoodrich Rugged Terrain (50,000 miles) is one of the best options. It offers you the best of both worlds – a little off-road traction, while maintaining a quieter, smoother ride. While its tread pattern is a little more edgy than a typical highway tire, it’s not nearly as meaty or blocky as a full-blown all-terrain tire. Highway-friendly but not afraid of some gravel, we think this is a great option for many of our 2010 Ford F150, F250, & F350 owners.

Before shopping for new Ford F150 tires, F250 tires, or F350 tires, it is of utmost importance to check your tire size and load requirement set by Ford. Some sub-models require a P-metric tire, while others require an LT tire, and there is a very big difference in how much weight those tires can support (even if the tire sizes are the same). Examine both the sidewall of your current tires, and the vehicle placard, to ensure you get the correct dimensions and weight capacity for your truck. Click here if you’re unsure of how to check your tire size.

Regardless of your tire size, driving preferences, and budget, be sure to check out AutoSquad for your 2010 Ford F150 tires, F250 tires, & F350 tires! We offer all the tires mentioned in this article, plus many others, at competitive prices and with the highest quality installation. On top of that, we bring them to you, and change them while you work or relax at home, saving you valuable time and money.

Contact AutoSquad at 855-484-3778, or visit to see our tire selection and make an appointment online. Please note that AutoSquad’s service is currently available only in the Washington, DC metro area.

2010 Toyota Corolla – The Best Tire Options

2010 Toyota Corolla

This article will give insight into the best tire options for the 2010 Toyota Corolla

As a 2010 Toyota Corolla owner, you should feel proud owning the 5th most popular selling vehicle in 2010.  I’m sure you bought this car for its reliability, quiet, comfortable ride, and excellent fuel economy.  Given its terrific reputation, chances are that your beloved Corolla has been running like a champ, but it’s probably due for a new set of tires.  If you are looking for recommendations on the best replacement tires, then you have come to the right place.  As an AutoSquad tire expert with several years of experience, I’d like to recommend your best tire options for your 2010 Toyota Corolla, while keeping value, performance, and tread life in mind.

2010 Toyota Corolla

The 2010 Toyota Corolla offered multiple trim levels and the O.E. (original equipment) tire size varied from trim level to trim level.  So, to make it easy for you, I’ve divided my recommendations based on the vehicle’s trim level (sub model).

2010 Toyota Corolla Base and LE Models – Tire Size 195/65R15 89S

The O.E. tires on the base and LE model were Continental ContiProContact.  This popular tire rates well with AutoSquad customers with an overall rating of 4.5 out of 5 stars, and comes standard with an 80,000 mile tread life warranty.  There several fantastic options outside of the O.E tire, including the BFGoodrich Advantage T/A and the Michelin Defender.

The BFGoodrich has an excellent UTQG rating of 680 and a traction rating of A.   In non-tire mumbo jumbo, it basically means you can expect between 65,000 and 70,000 miles in tread life, and superior traction (the “A” traction ratings is one of the best ratings that be assigned by the Department Of Transportation).  With its low price point and long tread life, it’s an excellent option.  AutoSquad customers agree with us and have rated this tire a 4.4 out of 5.

The Michelin Defenderis another great option for your 2010 Toyota Corolla.  This tire features a tread life warranty of 90,000 miles (whoa!), far surpassing any other tire in the market.  If long tread life is what you are after, this is the tire for you.  As with most all-season tires, the Michelin Defender is designed for year round all-weather use in dry, wet, and light snow conditions at above or below freezing temperatures.  By the way, did you know that you can get $70 back when purchasing 4 Michelin tires from now until April 15th, 2013?  Combine that with our sequester savings and you can save up to $130 on a set of 4 tires. 

2010 Toyota Corolla LE, S, and XLE Models – Size 205/55R16 89H

The original tire for these models was the Goodyear Eagle RS-A.  This tire is performance oriented, but only offers a UTQG rating of 260, which is relatively low based on industry standards.  It comes with an “A” traction rating, so it will perform well, but it may not be the best option for value-oriented buyers.  Luckily, there are a few different options that offer the same (or better) performance level with much a much higher estimated tread life warranty-including the Bridgestone Potenza RE970 AS Pole Position, Cooper Zeon RS3-A, and the Michelin Pilot Sport A/S Plus.

The Bridgestone Potenza RE970 AS Pole Position offers superior traction  with a “AA” traction, the best that can be assigned by the Department of Transportation.  With an estimated 40,000 miles worth of tread life, this tire combines a quiet ride with superior traction.  This would be a great fit for any of the 2010 Toyota Corolla models.

The Cooper Zeon RS3-A is an AutoSquad “Staff Pick”, and for good reasons.  This tire was also rated “Best in Class 2011″ by a popular consumer magazine, and combines excellent tread life miles with exceptional traction and handling.  Another “AA” traction rated tire, this one has a UTQG tread life rating of “500”, meaning you can expect around 50,000 miles in tread life.  It’s relatively rare for a tire focused so much on performance to have that many expected miles.  AutoSquad Customers rate this tire 4.5 out of 5.  If you are looking to combine high mileage with best in class traction and handling, then the Cooper Zeon RS3-A is the tire for you.

Now if you want the best in class with the best overall offering then the Michelin Pilot Sport A/S Plus is the best Ultra High Performance option for your 2010 Toyota Corolla.  This tire comes standard with a 45,000 mile tread life warranty and excellent traction and handling.  The Michelin Promise Plan means you can have the utmost confidence in your tire quality.  With its 30 day Satisfaction Guarantee, 3-year flat tire changing assistance, and its mileage warranty, Michelin offers one of the most comprehensive warranty programs in the industry.  Buying 4 of these Michelin tires will also get you $70 Back in mail in rebates (runs until April 15th), and if you combine that with AutoSquad’s Sequester Savings(runs until end of March, 2013) you can get $130 off a set of 4 tires! Now that’s savings everyone in Washington can agree on!

2010 Toyota Corolla XRS Model – Size 215/45R17 87W

The 2010 Toyota Corolla XRS came standard with the Goodyear Eagle RS-A.  As I mentioned earlier, this tire has great traction but lacks in overall tread life mileage.  The “A” traction rating is good, but otherwise this tire rates poorly for noise comfort and tread life. 

The Bridgestone Potenza RE970 AS Pole Position is a winner in this size.  With its “AA” traction rating and 40,000 mile tread life warranty, this tire is ideal for consumers who want superior traction and a quiet ride. 

The Continental ExtremeContactDWS is another excellent option for your 2010 Toyota Corolla XRS.  With an “A” traction rating and a 50,000 mile tread life warranty, this tire will provide some of the longest life you can expect from an Ultra High performance tire.  AutoSquad customers give this tire one of the highest ratings on our website with a 4.8 out of 5 overall rating.  Intended for use in dry, wet, and snowy conditions, this is a tire that has been rated well by a popular consumer magazine for the past few years.

However, if you are an environmentalist or a value shopper, then the Bridgestone Ecopia EP422 is the tire for you!  Another AutoSquad “Staff Pick”, Bridgestone designed the tire an eco-friendly tire for consumers seeking fuel efficiency and low rolling resistance.  With a high tread life mileage warranty, 65,000 miles, this tire is optimal for consumers who prefer high mileage and fuel efficiency over extreme traction.  This tire still has an “A” traction rating so it still offers good traction.

AutoSquad offers all of the above tires, and many more, at highly competitive prices.  So, here’s a bit of shameless self-promotion in case you are unfamiliar with AutoSquad.  We are a tire retailer but also a mobile tire and brake installation service.  We conveniently install tires and brakes at your home or workplace, and you will notice that our customers love us! We also find that our customers save 10-15% overall when compared to our competitors!  We save you time and money; all the while your tires and your 2010 Toyota Corolla are getting the best possible TLC!


Contact AutoSquad at 855-484-3778, or visit to see our tire selection and make an appointment online. Please note that AutoSquad’s service is currently available in the Washington, DC metro area only. 

Sequester Discounts: Save up to $130 on Tires & Brakes

Sequester Discounts: Ease Your Sequester Pain and Save Up to $130 On Tires & Brakes

Sequestration: Appropriation, impounding, seizure, repossession. Yikes, that sounds scary. And that’s just the dictionary definition.  Our government’s definition? – Across-the-board spending cut to the tune of $85 billion.

Sequester-bluesUnfortunately, we’re not just talking about government jobs. We’re talking major trickle down effects as workers lose wages and citizens lose much-needed services and support

Regardless of whether or not you agree politically with the cuts, it’s hard to deny the vast effect it will have on people of all demographics.

Here in the DC metro, the largest industry sector is the government and government-related businesses. states that Virginia will be hit hardest.  Our friends and neighbors are already receiving furlough notices and many are starting to curtail their spending to cushion the income cuts.

While we think preparing for income changes is a good idea, risking safety is not. Along those lines, cutting out extra vacations and shopping sprees may make sense., but postponing vehicle maintenance (like replacing old tires and brakes) may not.. Low tire tread and worn brakes can risk your safety, and the safety of your loved ones. In an effort to share the pain and ensure the safety of our neighbors, AutoSquad is launching Special Sequester Discounts for the month of March! We are making historic cuts to our prices. Here’s what you can expect to save when you buy tires and brakes from us this month:Sequester-discounts-save-130

-SAVE $25 when you buy 2 (or 3) tires

-SAVE $50 when you guy any 4 tires

-SAVE 10% on parts and labor for brakes!

You can pile-on these Sequester Discounts and save up to $130 on a set of tires with these manufacturer rebates

 -Up to $60 in rebates on 4 Pirelli tires.

-Up to $70 in rebates on 4 Michelin tires.

-Up to $80 in rebates on 4 Dunlop tires.

-Up to $80 in rebates on 4 Goodyear tires.

This is an unprecedented discount in the tire world, and we hope you take advantage of it a.s.a.p. Give us a call to speak with our knowledgeable brake and tire experts at 855-484-3778, or visit us online at to get more info and to place an order. Don’t let this offer pass you by! Doesn’t it feel good to be financially responsible without compromising safety? We thought so, too.

Pirelli 2013 Tire Rebate Offer


Pirelli 2013 Tire Rebate OfferBuy a set of 4 Pirelli Tires from AutoSquad between Mar 1 and April 14, 2013 and receive $60 back in the form of a pre-paid card through this mail-in rebate offer. You’ll also get entered for an opportunity to win a free trip to Rome! Visit AutoSquad’s website for more details or to download the rebate form.


Eligible Tires for $40 Mail-In Rebate
Cinturato P7
Cinturato P7
Cinturato P7 RFT
PZero Corsa System
PZero Nero
PZero Nero All-Season
PZero Nero M+S
PZero Rosso
PZero System
P6 Four Seasons
P6 Four Seasons Plus
Scorpion ATR
Scorpion STR
Scorpion Verde All-Season
Scorpion Zero
Scorpion Zero Asimmetrico

Dunlop 2013 Tire Rebate Offer


Dunlop-2013-Tire-RebateBuy a set of 4 Dunlop Tires from AutoSquad between Mar 1 and May 31, 2013 and receive up to $80 back in the form of a pre-paid card through this mail-in rebate offer. Visit AutoSquad’s website for more details or to download the rebate form.

Eligible Tires for $40 Mail-In Rebate
Rover H/T
SP Sport 01
SP Sport 01A
SP Sport 01 A/S
SP Sport 01 DSST
SP Sport 01A DSST RunOnFlat
SP Sport 600
SP Sport 2030
SP Sport 2050
SP Sport 2050
SP Sport 5000 Asymmetrical
SP Sport 7000 A/S
SP Sport 7010 A/S DSST
SP Sport 8000
SP Sport 5000 M
SP Sport 5000 Symmetrical
SP Sport 5000M DSST CTT
SP Sport 5100
SP Sport 4000T DSST

Eligible Tires for $80 Mail-In Rebate
SP Sport Maxx
SP Sport Maxx A1 A/S
SP Sport Maxx A1-A A/S
SP Sport Maxx GT 600 DSST CTT
SP Sport Maxx TT
SP Sport Maxx A
SP Sport Maxx A1
SP Sport Maxx Race
SP Sport Maxx DSST RunOnFlat
SP Sport Maxx GT
SP Sport Maxx GT DSST
SP Sport Maxx 050
SP Sport Maxx 101