265/40R21 vs 275/25R24
275/25R24 is 0.2% taller (+0.07 in) and 0.39 in wider than 265/40R21.
275/25R24 is 0.2% taller than 265/40R21. That is inside the ±3% most shops treat as a straight swap.
Real speed on 275/25R24.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 275/25R24 tires
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265/40R21 or 275/25R24?
Can I use 275/25R24 instead of 265/40R21?
275/25R24 is 0.2% taller than 265/40R21. 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 275/25R24 you are really doing 60.1 mph if the speedometer was set up for 265/40R21. Going the other way, 265/40R21 would make it read 59.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.03 in (+1 mm) under the axle.