265/35R20 vs 255/40R20
255/40R20 is 2.7% taller (+0.73 in) and 0.39 in narrower than 265/35R20.
255/40R20 is 2.7% taller than 265/35R20. That is inside the ±3% most shops treat as a straight swap.
Real speed on 255/40R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 255/40R20 tires
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265/35R20 or 255/40R20?
Can I use 255/40R20 instead of 265/35R20?
255/40R20 is 2.7% taller than 265/35R20. 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 255/40R20 you are really doing 61.6 mph if the speedometer was set up for 265/35R20. Going the other way, 265/35R20 would make it read 58.4 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.36 in (+9 mm) under the axle.