275/70R17 vs 315/70R17
315/70R17 is 6.9% taller (+2.20 in) and 1.57 in wider than 275/70R17.
315/70R17 is 6.9% taller than 275/70R17. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 315/70R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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275/70R17 or 315/70R17?
Can I use 315/70R17 instead of 275/70R17?
315/70R17 is 6.9% taller than 275/70R17. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. Also match or beat the original load index and speed rating, and check that the wheel width suits the new tire.
Will my speedometer be off?
At an indicated 60 mph on 315/70R17 you are really doing 64.1 mph if the speedometer was set up for 275/70R17. Going the other way, 275/70R17 would make it read 56.2 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +1.10 in (+28 mm) under the axle.