265/50R20 vs 265/60R18
265/60R18 is 0.3% taller (+0.09 in) and the same width than 265/50R20.
265/60R18 is 0.3% taller than 265/50R20. That is inside the ±3% most shops treat as a straight swap.
Real speed on 265/60R18.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 265/60R18 tires
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265/50R20 or 265/60R18?
Can I use 265/60R18 instead of 265/50R20?
265/60R18 is 0.3% taller than 265/50R20. 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 265/60R18 you are really doing 60.2 mph if the speedometer was set up for 265/50R20. Going the other way, 265/50R20 would make it read 59.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.04 in (+1 mm) under the axle.