245/75R16 vs 305/70R16
305/70R16 is 7.7% taller (+2.34 in) and 2.36 in wider than 245/75R16.
305/70R16 is 7.7% taller than 245/75R16. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 305/70R16.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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245/75R16 or 305/70R16?
Can I use 305/70R16 instead of 245/75R16?
305/70R16 is 7.7% taller than 245/75R16. 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 305/70R16 you are really doing 64.6 mph if the speedometer was set up for 245/75R16. Going the other way, 245/75R16 would make it read 55.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +1.17 in (+30 mm) under the axle.