215/75R15 vs 245/40R20
245/40R20 is 0.1% taller (+0.02 in) and 1.18 in wider than 215/75R15.
245/40R20 is 0.1% taller than 215/75R15. That is inside the ±3% most shops treat as a straight swap.
Real speed on 245/40R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 245/40R20 tires
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215/75R15 or 245/40R20?
Can I use 245/40R20 instead of 215/75R15?
245/40R20 is 0.1% taller than 215/75R15. That is inside the ±3% most shops treat as a straight swap. 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 245/40R20 you are really doing 60.0 mph if the speedometer was set up for 215/75R15. Going the other way, 215/75R15 would make it read 60.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.01 in (+0 mm) under the axle.