255/70R18 vs 295/70R18
295/70R18 is 6.9% taller (+2.20 in) and 1.57 in wider than 255/70R18.
295/70R18 is 6.9% taller than 255/70R18. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 295/70R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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255/70R18 or 295/70R18?
Can I use 295/70R18 instead of 255/70R18?
295/70R18 is 6.9% taller than 255/70R18. 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 295/70R18 you are really doing 64.1 mph if the speedometer was set up for 255/70R18. Going the other way, 255/70R18 would make it read 56.1 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +1.10 in (+28 mm) under the axle.