305/55R20 vs 295/60R20
295/60R20 is 2.2% taller (+0.73 in) and 0.39 in narrower than 305/55R20.
295/60R20 is 2.2% taller than 305/55R20. That is inside the ±3% most shops treat as a straight swap.
Real speed on 295/60R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 295/60R20 tires
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305/55R20 or 295/60R20?
Can I use 295/60R20 instead of 305/55R20?
295/60R20 is 2.2% taller than 305/55R20. 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 295/60R20 you are really doing 61.3 mph if the speedometer was set up for 305/55R20. Going the other way, 305/55R20 would make it read 58.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.36 in (+9 mm) under the axle.