How to Read a Tire Size & Understanding a Tire Sidewall - ABTL Auto Extras

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www.autobytel.c... Understanding the letters and numbers on your tire sidewall can be a bit confusing. Tak from Toyo Tires gives us some insight on how to read a tire size. His simple explanation addresses all the different specifications that are written on your vehicles tire. The sidewall of a tire contains a couple of key features:
Let's Take a Look for Instance at this Tire Size 255/35/R18 109V
The "255" in the first part of the tire size represents the section width of the tire. The "35" represents the tires aspect ratio or height. The "R" stand for Radial in tire construction and the "18" stands for the wheel diameter in inches. The "109" is the load index and represents the tires maximum load capacity at maximum inflation pressure. The "V" represents the speed rating which is the max allotted speed of a tire.
For those looking to get some advance knowledge about all the information a tire can present there is the DOT tire identification number (TIN).
An example of a TIN would be DOT CX91 XX31309
The "CX" represents the factory code or where the tire was manufactured. The "91" represents the size code. The "XX3" represents the options code. The last four digits on the TIN represent the week and year when the tire was made. So for instance "1309" means the 13th week in the year 2009.
Another bit of information contained on a tire sidewall is the maximum load capacity. The max load displays a weight at a certain PSI. But this is not the recommended tire pressure that you should inflate your tires to. Instead follow the manufacturer recommended tire pressure setting as seen on the inside of a car's door jam.
Hopefully this video can give you some insight on how to read a car tire.
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Опубликовано:

1 окт 2024

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Комментарии : 178

@kidproduction6720 6 месяцев назад

You lost me in 10 seconds after you started explaining.

@Cdmxforever 4 месяца назад

I'm sorry for you...... But you need to understand that not everyone has the same intelligence as you, but don't worry there's a lot of schools for slow learners challenged, special people like you. 😉

@chrisd6287 Месяц назад

How?

@kidproduction6720 Месяц назад

@@chrisd6287mind your own business smart boy

@E_Rogerz Месяц назад

Idiot

@mtlicq 3 года назад

Excellent, straight to the point and still thorough, Video done in 2 minutes. Saved 3 minutes of time and bandwidth. Well done and Thank you!

@nathanielfinzi2201 3 года назад

I clicked on it just to see the rest of the rim

@ikGREENY 6 месяцев назад

Pretty underwhelming if you ask me lol

@doddgarger6806 4 года назад

What about the red and yellow dots and why almost all tire shops ignore them yet most manufacturers pay very close attention to them!?

@ethanolfree28 2 года назад

Best vid on subject, no b.s. very good.

@FreedomToYourMind 4 года назад

This is a really good video. Im so happy i found it

@robocopvn 11 лет назад

No, ratio mean it's 55% of 255. 255/55 R18 means the tire has 255 wide, height is 55% of 255 is 140.25 and the diameter is 18

@Frijo1 5 лет назад

what does the numbers mean? inches or what still confused

@fordnut4914 5 лет назад

@@Frijo1 mill meters

@wce05308 4 года назад

@@Frijo1 millimetres (metric measurement)

@gofigure84 3 года назад

Another key is the 255 is width at the widest point. It is not your tread with

@warrenmcelroy4718 3 года назад

@@gofigure84 also he is wrong about the 55%. The height is not 55% of 255, the “55” represents only the height of the sidewall in relation to the width of the tire, not the entire height of the tire in relation to its width. Now I’m sure the dude knows this but he didn’t present it in that way

@macbomb 11 лет назад

M+S is a Snow tire with a "Mud shedding" pattern, it stops mud from packing into the tread in theory. M+T is the same thing only a all season all terrain tire. AKA "on road/off road" tire. If you drive a M+S in the summer it will be ruined in no time. They have a softer compound that works in snow really good. In PA a lot of my family have 2 sets of tires/rims, 1 just for winter and one for the rest of the year. The M+T would be a good all season tire, that again in theory would shed mud.

@TheJeff509 Год назад

P⁰

@RageHammeri Год назад

häöhlwkögsyyrty😂yueyrhheehh😂😂😂th😂reehhyy😂rer😂eh😂😂h😂e😂😂he😂hy😂😂😂yeeyy😂😂😂yh😂😂😂hyy😂😂😂😂yyyuuuuuyyyyyyyyyyyyyyyyyyyyyyyyyyyrhtgeenwe

@briancougar2044 3 года назад

Concise and easy to understand with visuals to reinforce the presentation! Well done! Now, I'm going out to look at my tires.

@dennismelton2261 2 года назад

Absolutely

@garrysingh9753 2 года назад

Hi mate, I have changed my vehicle Isuzu d max 2013 tyre and rims (215 55 r15 to 255 60 r18) since then rear brake stated making noise whenever stop the car. Brake pads are checked and are in condition, unable to understand what cause the issue? This vehicle has shoe drum brake on the rear? Any advice

@mohsenal-baidhany4388 2 года назад

The best video so far this needs to be up there, short and straight to the point

@shellyjones2130 2 года назад

@leol2110 2 года назад

So if i want a taller tire i could go up in the aspect ratio?? But still have the same width?

@MaSTAChO87 11 лет назад

why do you have to follow the vehicle manufacture recommend setting for tire pressure? instead of what it says on tire?

@peterrudy9207 2 года назад

After you thoroughly wash your tires with a pressure washer . Apply 303 Protectant to resist them from drying out and cracking .

@cockeyedoptimista 6 месяцев назад

Thank you! I had no idea I could protect my tires from drying out somewhat.

@peterrudy9207 6 месяцев назад

@@cockeyedoptimista You're welcome , the other day I power washed my engine and let it dry of course . Then liberally sprayed 303 on it and let it soak in overnight . It will collect dirt and after a month . I will clean that off and go another six months ? to do it again . Keeps all the rubber and plastic parts , looking new .

@cockeyedoptimista 6 месяцев назад

@@peterrudy9207 Thanks for taking the time for that detailed answer. Hafta tell ya: I'm a chick, if you couldn't tell by my username. I have a little car and I do the minimum for it, mostly from lack of time, tools and money. I park outside at our apartment building near DC. But I just had to replace the two front tires and I was told dryrot can happen even faster if you don't drive much. But I'm not going to be washing my engine anytime ever. I want to just sell it and get a good bicycle. I'm trying to understand what you said about the 303, though. So it protects the engine and collects all this dust, etc, on its surface, gunk just sticks to it bc it's viscous or smthg but the stuff doesn't get into the parts? And then you rinse it all off and leave it for 6 months and the engine is shiny and nice? So you rinse it and then it still stays sort of protected? I see why you you'd let it dry first before spraying smthg oily on it, as that would seal in the water and cause rust. Well, sorry that was solong and unimportant

@peterrudy9207 6 месяцев назад

@@cockeyedoptimista It's water based as no doubt why it gets absorbed so well . Surface dirt wouldn't be an issue , just that I like the engine to be " clean " . And applying it two times per year to soak in has no bad effect . I don't expect it has much of an effect on metal . Though there are sprays for the engine to kepp it shiny and " protected " after cleaning . And since I have an open air intake , I stuff it with a small microfiber towel to keep water out as I power wash it . RU-vid channel " Sweet Project Cars " talks about using 303 Protectant , more extensively .

@ucheucheuche 6 лет назад

Got more than I bargained for here 😵💫. Replacing electric scooter

@Cdmxforever 4 месяца назад

Thank you very much! No flucking unnecessary blah blah blah..... 👊🏻💥🇲🇽

@LubaLuba1 3 года назад

So what number tells me about the thickness of the wall of the tire?? And if my car calls for 245/60 can 245/55 work too?

@gofigure84 3 года назад

There is a listing for the thickness of the side wall. It is the ply listing. Ply or sections determines thickness. The only time it matters is on trucks. Regular tires are 8 ply. When thicker is needed for towing and payload weight you go up as needed. 10, 12, 14 and so forth. Yes you can use a 55 instead of a 60 but it will be a little shorter.

@vrvignesh7 8 лет назад

hi i want to upsize my tyres default company size is 80/100 r17 rear can i go with 120/80 r 17 ????

@winstonharris5274 2 года назад

Why can't they explain the tyer size like you Simple and easy to understand The rest bullxxxxx around the place to make money

@dulangaperera7977 3 года назад

Thanks

@hernes0071 8 лет назад

My question is WHY IS IT A RATIO NOT AN ACTUAL SIZE NUMBER UGH...

@autobytel 8 лет назад

These are actual size numbers not ratios: 255 = section width in mm 55 = sidewall height in mm 18 = wheel diameter in inches

@hernes0071 8 лет назад

Autobytel that 55 is a ratio of Withh and cross section I6t says it in the video and every website talking about tires and those numbers and i think it is stupid

@hernes0071 8 лет назад

and so does this calculator i.imgur.com/W4M07j6.png witch means i found a place to use for what i need and it can be found here www.miata.net/garage/tirecalc.html

@osibosi99 6 лет назад

If that is correct why are 205/60R16 tyres smaller in diameter then 215/60R16 ?

@fatnfurious9171 6 лет назад

Sum tires are 33x12.5 16. Ur just not used to it being a metric measurement.

@goldwolf0606 4 года назад

Great video, but missing the quality grades. You should have told us what grades makes a certain brand of tire be considered better or worse than another brand of tire of equal size.

@mahamettsedali9014 2 года назад

195/R16C how to calculate

@gabrielM1111 4 года назад

Million years from now some beings will find a human tire and spend years trying to decode it.

@geoffgeoff143 2 года назад

255 what?

@bmwmsport11 11 лет назад

Is the aspect ratio basically the height of the wall? So the wall would be 55mm high? I'm so confused I heard that the middle number is the height but you have to divide something to get the height...

@uol1051 3 года назад

JesusHCrist, bmw, the key word here was RATIO.

@Pinoyphilly 4 года назад

My sister gave me her 16 inch rim 205/55 R16 from her BMW. Can I put a 215/60 R16 tire on it? Let me know, Thanks!

@khongcolong Год назад

Now I can read it but I don’t know what it means. V is the speed. What is v equivalent to MPH?

@faarhaannkhan-kb3vh 6 лет назад

Bull shit explanation If it’s says 109v how I would I know what’s the load capacity and speed

@JayDee-kw8oz 2 года назад

Well half the people here are saying this video sucks while the other half says its the best thing ever. If it was really so great then probably no one would say it sucks.

@puertoriqueno24 Год назад

I came here for the manufacturing date ❤

@INJURYCOMP 7 лет назад

OK!! I have been checking the date codes on tires for years (since 60 minutes did d story on it over 20 years ago). I can clearly see the date code on two of my tires. It is just like it is stated here. Those tires also say "MADE IN INDONESIA". The tire code is a 4 digit number (within a box) next to the other numbers on the DOT code. The other two tires say, "MADE IN CHINA". The DOT code starts out like the other tires but there is no box or other numbers that LQQK like this date code. I have LQQKED over and over and can't find any code that resembles any of the ones found here. Anyone know about the date code on tires made in China?

@INJURYCOMP 7 лет назад

I called the Dealer I bought the tires from (national, reputable company that starts with an "F" ends with an "E") and I got my answer. He told me that the DOT date code was on the other side of the tire. Nevertheless, he said they always put the DOT code, complete with the date code, on the receipt. I checked and, yes, the DOT code for all 4 tires were actually on the receipt. The two tires manufactured in Indonesia's DOT was a little longer than the other two tires but they all ended with the date code. All 4 tires were manufactured in 2016 so I am good with that.

@gofigure84 3 года назад

The DOT code is on both sides the date code is only on one. If you don't see the date on the outside look on the inside.

@jamesseely1163 2 года назад

But what do those number mean? I get that the 55 is the tire aspect ratio, but 55 what? Cm?

@Mrkatt763 6 лет назад

FYI, you need to speak in plain English and explain throughly about “109”, unless you have a chart to corespondent. What is Max capacity of 109? Example; “Color”, you need the right color so it’ll work! Ok, what is the correct color? But if there is a color chart to reference by then yes it’s a no brainer.

@davidstephens4639 5 лет назад

That's the easy part. The hard part is getting people to care. Especially females.

@donmojo632 2 года назад

Thank you

@EvolutionT4R 7 лет назад

So how do u compare the other form for example 33x12.5 what would that be?

@warrenmcelroy4718 3 года назад

It’s depends on the size of the wheel, unlike Standard measurements a 305/75/16 is Not the same size as a 305/75/20. The size of the wheel changes everything

@Vakok7 3 года назад

V it means how can go???

@wilsonmanlapaz1470 7 лет назад

hi i have question i have 215/60/17 tire its ok i put 215/55/17 tire thanks

@WeightyLemur 7 лет назад

As long as you have enough space so the tire won't hit the tire walls in your car, you're fine

@CLH126 3 года назад

Charming chap. Thx. :)

@george1984ts 5 лет назад

Let’s crank the music so we don’t get copyrighted and no one can understand

@deagondosson6650 4 года назад

What if you get after market tires and different sizes I always go by the max cold pressure because how are we supposed to know what a manufacturer would like it to be at if it is different size

@gofigure84 3 года назад

Aftermarket tires? You mean wheels? If you go with a skinny low profile tire on a street set up you want to run 40+ for the pressure. This is to give the tire less give on bumps to keep from damaging the wheel. Otherwise follow the manufacturer spec in the driver door jam for tire pressure

@mikiram9764 10 лет назад

Awesome explanations :)

@ParsaSorbi Год назад

THANKS :) Very informative . . . . . . . .

@codysmith9128 3 года назад

What tires will not hold the weight of a 2007 Dodge Magnum because I have tires 245/30zr20 but everybody says it won't hold weight of my car

@gofigure84 3 года назад

Load index has to do with weight not size. Now whether those fit is another issue

@gofigure84 3 года назад

Stock 20 size was 245/45R20 so I would stick to that vs the thinner 30 ratio.

@macbomb 11 лет назад

Wonder why someone would not like this? Nothing here was new to me, but a lot of people do not know this basic information.

@Mrkatt763 6 лет назад

What max capacity of 109? Where the chart to reference to? Remember, dumb and dumber are watching these video to educate themselves so you have to make sure you explain it throughly

@tylerbrade6731 6 лет назад

I can't find the marking on my michelin pilot power 2ctadial 150/60

@haroldestrada2078 3 года назад

Very good despcription Thank you

@jorishines1645 2 года назад

I've always filled tires to either the noted max. tire pressure or just under. How is your vehicle manufacturer going to be able to tell you if you mount a different tire than it came with, if the new tire has a different load rating?

@shellyjones2130 2 года назад

@cockeyedoptimista 6 месяцев назад

Maybe they're referring to the recommended tire size

@TRIBAL-x7y 3 года назад

Thanks for ur video

@norisboren5402 3 года назад

This 255mm/55% R18 in. , the .55 is MULTIPLIED times the 255 = 133.25 mm is side wall height. ok.

@uol1051 3 года назад

Thought process okay, but math wrong. Answer is 140.25mm

@norisboren5402 3 года назад

My apologies to all. 255mm 55mm 18 inch is sidewall height 255×55 =140.25 mm Thanks for checking my multiplication .

@daydreamer77w46 2 года назад

2 tech the 255 is what?

@Efrain891 4 года назад

"V is the speed rating" and V indicates what speed?? My speedometer has numbers not letters.

@uol1051 3 года назад

The speed code charts can be found on line at almost any new tire sales website.

@tictac9367 2 года назад

Lmao i was thinkin the same what speed is v lol

@vishnunair1845 3 года назад

This video was made in 2013. So useful

@dm3694 6 лет назад

Thanks brother I started a Tyre business this is so helpful to me.

@JarmalK Год назад

How’s it going?

@abraamchavarria6029 9 лет назад

thanks...super simple.

@EddieUltimateChampion 6 лет назад

This video came out in 2013, that tire you used as an example was 4 yrs old 💁

@virendradr 3 года назад

Excellent information

@onlyoneromeo 3 года назад

You need to explain to ppl what aspect ratio means.

@gofigure84 3 года назад

How thick the sidewall is. Lower number skinnier tire.

@onlyoneromeo 3 года назад

@@gofigure84 Aspect ratio is more than that. It represents the height by calculating a percentage of the width. So two 60 series tires will be different heights if the first number is different in both tires. For example 255/60 vs 285/60. The 285 will be taller even though they are both 60 series tires.

@gofigure84 3 года назад

@@onlyoneromeo specifically yes but 98% of the people watching this are involved in the repair industry to get too specific. The basic answer that I gave is the easiest

@Alfredorubio630 5 лет назад

How about explaining this . if my car original tires are 14" 185 60 14 . and if I upgrade to 16" rims. What tire size should I use?????????

@Redtooth75 5 лет назад

The easiest way to find out is to find a tire size chart online. tiresize.com is a good one

@Alfredorubio630 5 лет назад

Ok.thanks

@gricegodis5737 5 лет назад

@@Redtooth75 cocelit

@Redtooth75 5 лет назад

@@gricegodis5737 what?

@winstonharris5274 2 года назад

Thank you Well done my brethren

@simonyu2843 3 года назад

needs some detailed explanation

@alex1diy179 3 года назад

cool

@norisboren5402 3 года назад

Thank You for multiplication correction .

@Hopbest 6 лет назад

What is the meaning of DOT 9L 03 MLX

@gofigure84 3 года назад

That is the DOT number. On the other side of the tire is the same number with four numbers added for the date code

@waggingtailluna 4 года назад

Thanks

@funny9309 4 года назад

Nice video very short

@portcityfishing1919 8 лет назад

Can I put 255/70/r18 tires on a p255/70/r18? And what does the P stand for?

@808breaksbad. 7 лет назад

P stands for "passenger" as opposed to LT which is "light truck"

@gofigure84 3 года назад

If there is no letter it is a passenger tire tire and is the same as a P255/70R18

@javediqbal-tc7ro 6 лет назад

Hi.Q to tire experts,,my vehicle current tire size is 205 x 65 R 15 what will happen if I upgrade to 215 x 65 R 15 would there be any affect due to this change..

@JohnSmith-dg9sy 6 лет назад

Your speedo will read slightly slower than your actual speed - not a big deal, just something to be aware of You'll be adding slightly more unsprung weight - again, not a big deal as it wont be much but it could effect handling and braking as the tyre circumference will be slightly larger you'll essentially be gearing up slightly so you'll use more fuel in stop-go traffic and your acceleration (if your care about that) will be slower but as the tyre will have to spin fewer times to cover the same distance you'll use less fuel on motorways and have a higher top speed - again, it's a small change so wont effect things too much be aware of your scrub radius as changing that too much can effect handling too have a look on this site to get a rough idea of how it'll effect things www.wheel-size.com/calc/

@danlivni2097 3 года назад

@@JohnSmith-dg9sy Question, My tire size is 215 60 R60. 95H I have a chance to get discounted Bridgestone EL400-02 tires new. The only thing is, the Bridgestone tires are 215 60 R16 94V. Does that matter if the tires are 94V instead of 95H

@JohnSmith-dg9sy 3 года назад

@@danlivni2097 so the H/V is speed rating H is rated to a max speed of 130mph/210kmh V is rated to a max speed of 149mph/240kmh as it's a higher rating it'll be absolutely fine to use The 94/95 is the load rating 94 is rated to 670kg per tyre 95 is rated to 690kg per tyre there's not a massive difference between them, the tyres should be fine just make sure you're not overloading them

@danlivni2097 3 года назад

@@JohnSmith-dg9sy Question for you, cause I'm having problems with these new tires I got. I'm getting the shaking in the front of the car, which I never got with the previous tires I had on the car. So Saturday I had the mechanic put on the Bridgestone El400-2 tires in the front. They're 215 60 R16 94v on the front. For the rear he put on these Pirelli P7 216 60 R16-95h. The car recommends 95h. I also got a car inspection that day. When I'm driving on the highway with the new tires, I noticed there's a shaking in the front, especially when I'm going over 60 miles an hour, like 65 and 70 miles an hour. There's even a shaking on the steering wheel. I didn't get this with the previous tires I had. With my previous tires I had different brands on the front and back. I'd had Sumitimo on the front and BF Goodrich on the back. Both tires were 95h which is what the car recommends. What do you think this shaking is from. Do you think the Bridgestone 94v is doing that, or maybe the Bridgestones are defective tires. I'm thinking maybe I should rotate the tires and put the Pirellis on the front and put the Bridgestones in the back. Would that help with stop the shaking in the front. Or should I just get two new tires to replace the Bridgestone and have tires rated at the 95h, which is what the car wants. I bought the Bridgestones and Pirelli tires on eBay. I bought them from two different people. I bought the Bridgestone from one person and I bought the Pirelli from another person. Both have great ratings on eBay.

@JohnSmith-dg9sy 3 года назад

@@danlivni2097 sounds like a wheel balance issue, take it back to the place you had the tyre's fitted and tell them you're getting vibration through the steering wheel at speed and they should fix it for you

@aeronYTco Год назад

🤘

@winstonharris5274 2 года назад

Best one so far

@themiddlekingdom9121 3 года назад

Tak, can I replace 185 70 14 tire size with rim with 185 65 14 tire size with rim ? My original tire size is 185 65 14.

@Jeanyuhzz 3 года назад

Wouldn’t recommend

@themiddlekingdom9121 3 года назад

@@Jeanyuhzz Thanks for recommendation, fortunately, I was able to find the right size tires with aluminum rims as well on Facebook's market place, I paid only $100, very good deal indeed.

@gofigure84 3 года назад

They were all for the same size rim so they would all mount. You would just be slightly taller. Not by any amount you would likely notice.

@themiddlekingdom9121 3 года назад

@@gofigure84 Thanks for information !

@Jeanyuhzz 3 года назад

@@gofigure84 it can still cause damage in the long run

@johnedmunds1380 5 лет назад

Wtf

@LuisMelo1982 8 лет назад

I have a question. I have a Rav4 2012 Sports Utl., I am looking to purchase tires. The original tire is Bridgestone Dueler H/T (D687) Tire P235/55R18. Now I would like to know if I can use this one instead without having any issues Bridgestone Dueler H/T (D687) Tire P235/65R18. Thank you

@danlivni2097 3 года назад

No, i wouldn't do that

@gofigure84 3 года назад

You can use any brand as long as size and specs are compatible

@warrenmcelroy4718 3 года назад

@@gofigure84 they’re asking about using a taller tire

@gofigure84 3 года назад

I thought they were trying to stay with the same brand but couldn't find the right size. I miss read.

@warrenmcelroy4718 3 года назад

@@gofigure84 I figured that’s what happened. Many of these questions and comments are very frustrating aren’t they? It blows my mind how many grown men don’t understand tire sizes and so many common sense issues. I’ve seen you answering many questions, God Bless You Sir

@7150285 11 лет назад

really confusing :( I bought all season tires yesterday and it didn't label "all season" on the sidewall but it does say M+S.

@808breaksbad. 7 лет назад

M+S = mud and snow.

@naimalizada8080 6 лет назад

Can we replace 245 55 19 with 255 60 19

@jimjambananaslam3596 6 лет назад

Yeah, I think that would be just fine.

@7150285 11 лет назад

I'm guessing they still don't understand it after seeing this video. I'm still learning and this video was very helpful and I learned what aspect ratio is from this vid. Btw do u know if M+S (Mud and Snow) means all season tires and M+T (Mud and Terrain) means all terrain tires?

@gofigure84 3 года назад

No. M+S is mud snow. M/T is mud terrain. All season is a street tire for dry and wet with light snow. All terrain is for wet light snow dirt and basic offroad. Can be used in mud but light mud is recommended.

@gofigure84 3 года назад

They have specific names for specific reasons. That's how the english language works. Words have specific meanings for a purpose.