285/65R18 vs 295/55R20
295/55R20 is 0.6% taller (+0.19 in) and 0.39 in wider than 285/65R18.
295/55R20 is 0.6% taller than 285/65R18. That is inside the ±3% most shops treat as a straight swap.
Real speed on 295/55R20.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 295/55R20 tires
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285/65R18 or 295/55R20?
Can I use 295/55R20 instead of 285/65R18?
295/55R20 is 0.6% taller than 285/65R18. 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 295/55R20 you are really doing 60.3 mph if the speedometer was set up for 285/65R18. Going the other way, 285/65R18 would make it read 59.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.09 in (+2 mm) under the axle.