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Metric Tire Sizes Confuse Me

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Old Oct 29, 2009 | 09:01 AM
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Default Metric Tire Sizes Confuse Me

Why does it have to be so complicated? What happened to "how tall" and "how wide" like the Inches system?

Anyway, my coworker has a Chebby with 285X75R16 tires on it and I like that size. I think it would work well on my Dodge. The rub is, I have 17" stock rims. So how does that convert? Maybe: 285X60R17?
 
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Old Oct 29, 2009 | 09:36 AM
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285 70 17 won't rub. my old bfg a/t in that size didn't with my off road rims.
 
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Old Oct 29, 2009 | 10:02 AM
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Sorry, when I said "rub," I meant "problem."

My Ram is a 4x4 RCSB with a 4" lift. I'm running 33X12.50R15's now on a set of centerline rims that are spaced outside the body about 2 inches. I don't like them. Hence the aquisition of the 17" steel stockers.

So, 285X70R17's eh? Are those tires about the same size as my coworker's 285X75R16's?

Thanks, Sherrif!
 
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Old Oct 29, 2009 | 10:32 AM
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http://www.dakota-truck.net/TIRECALC/tirecalc.html
on the left side you'll see tire a and tire b boxes, fill those out and check off the compare a to b and it'll compare them for you.

this one is another good one.
http://www.miata.net/garage/tirecalc.html

285 75 16 is 32.8" and 285 70 17 is 32.7"
285 75 17 is 33.8"

so i'm glad i didn't get 285 75 17 because i would be rubbing pretty good.
 
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Old Oct 29, 2009 | 10:44 AM
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those are some pretty good links.

this one is still my favorite.
http://www.1010tires.com/tiresizecalculator.asp
 
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Old Oct 29, 2009 | 10:55 AM
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yeah, i looked at that one too but closed it before i got the link and said "screw it, i already have 2"

the top link shows detailed info like the one you posted also.
 
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Old Oct 29, 2009 | 11:06 AM
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Originally Posted by Sheriff420
so i'm glad i didn't get 285 75 17 because i would be rubbing pretty good.
I check www.tirerack.com for that size and pulled up nothin. I don't think that's a popular size. Right now, I've got about 3 inches or more from the rear of the tire to the control arms at full lock. That'll be closer with the stock wheel because they'll be inside the body of the truck more (which I want). I guess a 285X70R17 wouldn't be bad.

Thanks!
 
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Old Oct 29, 2009 | 11:16 AM
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285 70 17 is a common size and is the perfect size as far as looks and not rubbing for a stock 4x4
 
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Old Oct 29, 2009 | 11:30 AM
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Gotcha. Unfortunately, I just looked up the tire I want to run (same as I have now: Maxxis Buckshot Mudder) and they don't come in a 285X70R17. They come in a 265 and 305 but no 285 for the 17" rim size. Would a 305 fit without rubbing? My truck's got a 4" lift but I know that has little to do with whether a tire will rub on the control arms. These tires are not the widest mudders out there and the tread patter is actually narrower than other mudders.
 
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Old Oct 29, 2009 | 11:37 AM
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have you checked out www.discounttires.com

i know there prices are a little higher than most...but shipping is next to nothing.
 
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