295/55R20 vs 275/60R20
275/60R20 is 0.7% taller (+0.22 in) and 0.79 in narrower than 295/55R20.
275/60R20 is 0.7% taller than 295/55R20. That is inside the ±3% most shops treat as a straight swap.
Real speed on 275/60R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 275/60R20 tires
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295/55R20 or 275/60R20?
Can I use 275/60R20 instead of 295/55R20?
275/60R20 is 0.7% taller than 295/55R20. 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 275/60R20 you are really doing 60.4 mph if the speedometer was set up for 295/55R20. Going the other way, 295/55R20 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.