275/35R21 vs 295/35R21
295/35R21 is 1.9% taller (+0.55 in) and 0.79 in wider than 275/35R21.
295/35R21 is 1.9% taller than 275/35R21. That is inside the ±3% most shops treat as a straight swap.
Real speed on 295/35R21.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 295/35R21 tires
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275/35R21 or 295/35R21?
Can I use 295/35R21 instead of 275/35R21?
295/35R21 is 1.9% taller than 275/35R21. 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 295/35R21 you are really doing 61.2 mph if the speedometer was set up for 275/35R21. Going the other way, 275/35R21 would make it read 58.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.28 in (+7 mm) under the axle.