245/35R20 vs 255/40R20
255/40R20 is 4.8% taller (+1.28 in) and 0.39 in wider than 245/35R20.
255/40R20 is 4.8% taller than 245/35R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 255/40R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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245/35R20 or 255/40R20?
Can I use 255/40R20 instead of 245/35R20?
255/40R20 is 4.8% taller than 245/35R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 255/40R20 you are really doing 62.9 mph if the speedometer was set up for 245/35R20. Going the other way, 245/35R20 would make it read 57.3 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.64 in (+16 mm) under the axle.