nates91xj
Member
Not sure why you quoted me on this, I am aware of how metric tire sizing, and tire sizes in general, work... Good info for people who need it though I guess315 is the width of the tire. The 40/50/60/70 number after the 315 is the percentage of the width of the tire expressed as sidewall. A 315x75r17 is 315mm wide and the sidewall is 75% of 315 (236mm = ~9"). The overall heighth of the tire is the sidewall calculated x2 + wheel diameter (9×2 +17 = 35). 315mm is ~= 12.5" width.
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