265/40R22 vs 265/50R20
265/50R20 is 0.3% taller (+0.09 in) and the same width than 265/40R22.
265/50R20 is 0.3% taller than 265/40R22. That is inside the ±3% most shops treat as a straight swap.
Real speed on 265/50R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 265/50R20 tires
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265/40R22 or 265/50R20?
Can I use 265/50R20 instead of 265/40R22?
265/50R20 is 0.3% taller than 265/40R22. 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 265/50R20 you are really doing 60.2 mph if the speedometer was set up for 265/40R22. Going the other way, 265/40R22 would make it read 59.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.04 in (+1 mm) under the axle.