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I was just in the beginning of my off road research and was wondering what the differences were between tire sizes? For example, I have seen Mickey Thompson Baha MTX Tires-LT315/75R16 and was told that they are this size is the same is (35x12.5's). Can someone explain this sizing to me? do tires start being numbered 33's, 35's when they get significantly bigger? or is this number measuring something else. I am asking this because my stock tires are normal 245/75/16's but wanted to know the range of larger tires I can look up. Thanks
 

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the tires like 265/70/16 is a metric tire size and say a 33x12.5x15 is a standard size. People that say a 315/75/16 is like a 35x12.5 are just saying that the conversion from metric to standard makes that tire about a 35x12.5. Similar to converting like mm wrenches to inch wrenches. I bought standard 33x12.5's because they were a few bucks cheaper than messing w/metric sizes.
 

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ictigoibitties said:
I was just in the beginning of my off road research and was wondering what the differences were between tire sizes? For example, I have seen Mickey Thompson Baha MTX Tires-LT315/75R16 and was told that they are this size is the same is (35x12.5's). Can someone explain this sizing to me? do tires start being numbered 33's, 35's when they get significantly bigger? or is this number measuring something else. I am asking this because my stock tires are normal 245/75/16's but wanted to know the range of larger tires I can look up. Thanks
245/75/16 is metric sizing.

245 = width in mm's
75 = aspect ratio (side wall height is 0.75 that of the width)
16 = your wheel diameter

So your tire is 245 mm wide (9.6") and 30.4" tall. Without lifting you can't go a helluva lot bigger than that, but you can squeeze 265/75/16's (~32x10.5) in there with no lift and not experience much rubbing off road.
 

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Metric versus standard. On most 16" wheels you will see metric sizing. 315 = width in millimeters, 75 = sidewall height as a percentage of tire width, 16 = rim size. To calculate your equivalent tire size divide the width by 25.4, multiply that answer by 0.75 then by 2 and add rim size. 315mm/25.4 = 12.40in, 12.4*0.75*2 + 16 = 34.60in
315/75/16 equates to 34.6 x 12.4
 

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Hey thanks everyone, I didn't know it was that simple.. Thanks again, I'll probably be back for more questions.. lookin at either fabtech or tuffcountry 5-6" Drop down lift along with 33's. Think i could fit 35's with either of the lifts?
 

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ictigoibitties said:
Hey thanks everyone, I didn't know it was that simple.. Thanks again, I'll probably be back for more questions.. lookin at either fabtech or tuffcountry 5-6" Drop down lift along with 33's. Think i could fit 35's with either of the lifts?
should be able to fit 35's with the fabtech 6"
 

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ictigoibitties said:
Hey thanks everyone, I didn't know it was that simple.. Thanks again, I'll probably be back for more questions.. lookin at either fabtech or tuffcountry 5-6" Drop down lift along with 33's. Think i could fit 35's with either of the lifts?
Get the fabtech 6, add a 2" bodylift from Roger Brown and i'd say no prob fittin 35's. Just be sure you gear it.
 

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i've heard people saying that they rubbed some times with lifts like that on 33" tires..but i didn't know that there backspacing was..but it was only during full flex..
 
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