295/35R21 vs 265/40R21
265/40R21 is 0.7% taller (+0.22 in) and 1.18 in narrower than 295/35R21.
265/40R21 is 0.7% taller than 295/35R21. That is inside the ±3% most shops treat as a straight swap.
Real speed on 265/40R21.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 265/40R21 tires
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295/35R21 or 265/40R21?
Can I use 265/40R21 instead of 295/35R21?
265/40R21 is 0.7% taller than 295/35R21. 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 265/40R21 you are really doing 60.4 mph if the speedometer was set up for 295/35R21. Going the other way, 295/35R21 would make it read 59.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.11 in (+3 mm) under the axle.