215/65R16 vs 255/35R20
255/35R20 is 0.1% taller (+0.02 in) and 1.57 in wider than 215/65R16.
255/35R20 is 0.1% taller than 215/65R16. That is inside the ±3% most shops treat as a straight swap.
Real speed on 255/35R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 255/35R20 tires
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215/65R16 or 255/35R20?
Can I use 255/35R20 instead of 215/65R16?
255/35R20 is 0.1% taller than 215/65R16. 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 255/35R20 you are really doing 60.1 mph if the speedometer was set up for 215/65R16. Going the other way, 215/65R16 would make it read 59.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.01 in (+0 mm) under the axle.