SidewallerTire & wheel calculators

245/50R20 vs 265/50R20

265/50R20 is 2.7% taller (+0.79 in) and 0.79 in wider than 245/50R20.

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Close match

265/50R20 is 2.7% taller than 245/50R20. That is inside the ±3% most shops treat as a straight swap.

245/50R20265/50R20Change
Diameter29.65″30.43″+0.79″+2.7%
Width9.65″10.43″+0.79″+8.2%
Sidewall4.82″5.22″+0.39″+8.2%
Circumference93.1″95.6″+2.5″+2.7%
Wheel20″20″Same
Revs per mile680663−18
SideTread
245/50R20265/50R20
Speedometer shows 60 mph61.6mph

Real speed on 265/50R20.

Ground clearance+0.39in

Change in height under the axle.

Width per side+0.39in

On the same wheel, split inboard and outboard.

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245/50R20 or 265/50R20?

Can I use 265/50R20 instead of 245/50R20?

265/50R20 is 2.7% taller than 245/50R20. 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 265/50R20 you are really doing 61.6 mph if the speedometer was set up for 245/50R20. Going the other way, 245/50R20 would make it read 58.4 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.39 in (+10 mm) under the axle.

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