BFG KO2 35X12.5R17 vs 315/70R17 - Jeep Wrangler Forum
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Old 11-29-2015, 10:35 PM
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BFG KO2 35X12.5R17 vs 315/70R17

What is the difference between the BFG KO2 35X12.5R17 and 315/70R17?

Both spec at 34.5" diameter and have the same load rating (3195 lbs @ 65 psi). The 315/70R17 has a slightly higher speed rating. Is the 315/70R17 a passenger car spec and the 35X12.5R17 a truck spec?
The 35X12.5R17 is listed at 66.5 lbs and the 315/70R17 62.4 lbs, so the 35X12.5R17 has more of something in it (rubber or plies I guess).
The 35X12.5R17 is slightly cheaper (around $20) than the 315. Also I see the 35 has the raised sidewall lettering and the 315 does not.

Any ideas?

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Old 11-30-2015, 11:49 AM   #2
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I looked them up on Tirerack.com and both are E rated. The 35 looked like the tread was a little wider.

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Old 11-30-2015, 12:03 PM
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I just called Northridge4x4 and the metric tire is smaller, despite being rated at the same diameter. There could be a difference in measurement method (loaded vs unloaded). I'm getting the 35s.
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