305/70R16 vs 315/75R16
315/75R16 is 5.5% taller (+1.79 in) and 0.39 in wider than 305/70R16.
315/75R16 is 5.5% taller than 305/70R16. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 315/75R16.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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305/70R16 or 315/75R16?
Can I use 315/75R16 instead of 305/70R16?
315/75R16 is 5.5% taller than 305/70R16. 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 315/75R16 you are really doing 63.3 mph if the speedometer was set up for 305/70R16. Going the other way, 305/70R16 would make it read 56.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.90 in (+23 mm) under the axle.