265/70R16 vs 275/45R21
275/45R21 is 0.5% taller (+0.14 in) and 0.39 in wider than 265/70R16.
275/45R21 is 0.5% taller than 265/70R16. That is inside the ±3% most shops treat as a straight swap.
Real speed on 275/45R21.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 275/45R21 tires
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265/70R16 or 275/45R21?
Can I use 275/45R21 instead of 265/70R16?
275/45R21 is 0.5% taller than 265/70R16. 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 275/45R21 you are really doing 60.3 mph if the speedometer was set up for 265/70R16. Going the other way, 265/70R16 would make it read 59.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.07 in (+2 mm) under the axle.