235/55R20 vs 265/40R22
265/40R22 is 0.6% taller (+0.17 in) and 1.18 in wider than 235/55R20.
265/40R22 is 0.6% taller than 235/55R20. That is inside the ±3% most shops treat as a straight swap.
Real speed on 265/40R22.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 265/40R22 tires
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235/55R20 or 265/40R22?
Can I use 265/40R22 instead of 235/55R20?
265/40R22 is 0.6% taller than 235/55R20. 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 265/40R22 you are really doing 60.3 mph if the speedometer was set up for 235/55R20. Going the other way, 235/55R20 would make it read 59.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.08 in (+2 mm) under the axle.