265/40R21 vs 275/45R21
275/45R21 is 4.8% taller (+1.40 in) and 0.39 in wider than 265/40R21.
275/45R21 is 4.8% taller than 265/40R21. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 275/45R21.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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265/40R21 or 275/45R21?
Can I use 275/45R21 instead of 265/40R21?
275/45R21 is 4.8% taller than 265/40R21. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 275/45R21 you are really doing 62.9 mph if the speedometer was set up for 265/40R21. Going the other way, 265/40R21 would make it read 57.3 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.70 in (+18 mm) under the axle.