255/75R17 vs 275/65R18
275/65R18 is 0.0% taller (+0.02 in) and 0.79 in wider than 255/75R17.
275/65R18 and 255/75R17 are the same overall diameter, so the speedometer stays accurate.
Real speed on 275/65R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 275/65R18 tires
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255/75R17 or 275/65R18?
Can I use 275/65R18 instead of 255/75R17?
275/65R18 and 255/75R17 are the same overall diameter, so the speedometer stays accurate. 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 275/65R18 you are really doing 60.0 mph if the speedometer was set up for 255/75R17. Going the other way, 255/75R17 would make it read 60.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.01 in (+0 mm) under the axle.