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How to understand metric tire sizes

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Old 08-20-2009, 09:30 AM   #21
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was just wondering what those numbers meant.. great post man
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Old 11-12-2009, 08:24 PM   #22
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http://www.dakota-truck.net/TIRECALC/tirecalc.html
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Old 11-12-2009, 08:45 PM   #23
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Quote:
Originally Posted by StaticFilter View Post
Actually, theres a size converter on our site... Its in the bottom of the "Mods & Tutorials" pull down at the top of the page
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Old 11-12-2009, 09:23 PM   #24
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Quote:
Originally Posted by RelentlessTaco View Post
Actually, theres a size converter on our site... Its in the bottom of the "Mods & Tutorials" pull down at the top of the page
Yeah but that calc i posted tells me my 35x12.50R17 is a 318/72 R17 no calculations needed
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Old 11-17-2009, 05:28 PM   #25
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Good Post Relentless!
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Old 11-17-2009, 05:37 PM   #26
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Originally Posted by Motive View Post
Good Post Relentless!
Thanks man!
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Old 01-27-2010, 10:39 AM   #28
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Nice job!

I like de-coding the mysteries, too!

That's why I did this LONG signature explaining the '09+ drive system we Off Road 4WD Tacos have now!...
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Old 03-11-2010, 07:03 AM   #30
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WOW, what an awesome place. Thanks for this info.
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Old 03-22-2010, 07:37 AM   #31
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I have always used this link to figure out tire sizes. Some of you might find it helpful.

http://www.truckaddons.com/Catalog/s...form_test.html
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Old 03-22-2010, 10:17 AM   #32
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awesome, thanks for clearing this up
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Old 05-15-2010, 05:24 AM   #34
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A nice, simple explanation! Much better than the one on Tire Rack, if I may say!

One other thing I found out though...'tire width' doesn't mean tread width. I was comparing new tires side by side: 'bone stock' 245/75/16 vs. 265/75/16 and 265/70/16 (the popular plus sizes for Tacoma's). Exact same tire...mfr. and brand.

I was surprised to find the 265/75 tread was quite a bit narrower than the 265/70 even though taller as expected. Checking Tire Rack again: the 265 refers to 'section width', an important distinction!

I suspect the shorter profile of the 70 series gives more sidewall support allowing the tread width (and contact patch area) to be wider for a given section width?

Just something to keep in mind when tire shopping!
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Old 05-15-2010, 05:46 AM   #35
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Great thread Eric!

If I might make a suggestion, can you expand your original post to include an explanation of the other info on the sidewall? Load range, treadwear rating, speed rating, date of manufacture. I think that would help folks out as well.
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Old 05-15-2010, 12:19 PM   #36
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Thanks for the recommendation, john. I'll probably add that stuff when I have enough time to do so.
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Old 05-15-2010, 01:37 PM   #37
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Quote:
Originally Posted by RelentlessTaco View Post
Thanks for the recommendation, john. I'll probably add that stuff when I have enough time to do so.
Cool, I think that you have cleared up a lot of confusion for some folks here.
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Old 09-01-2010, 11:22 AM   #38
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Old 11-30-2010, 10:35 AM   #39
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THANK YOU!!!

Good Job In Explaining Tire Code. Just What I Needed.



Dan
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Old 12-06-2010, 09:51 AM   #40
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perfect write up! i am one of those guys that wasn't sure how to work this out. i always just typed it into a tire calculator. very simple now that i see it on paper. if anything, u helped one TW mbr.
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