SidewallerTire & wheel calculators

265/45R20 vs 265/50R20

265/50R20 is 3.5% taller (+1.04 in) and the same width than 265/45R20.

Caution
Check before you buy

265/50R20 is 3.5% taller than 265/45R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.

265/45R20265/50R20Change
Diameter29.39″30.43″+1.04″+3.5%
Width10.43″10.43″0.00″0.0%
Sidewall4.69″5.22″+0.52″+11.1%
Circumference92.3″95.6″+3.3″+3.5%
Wheel20″20″Same
Revs per mile686663−24
SideTread
265/45R20265/50R20
Speedometer shows 60 mph62.1mph

Real speed on 265/50R20.

Ground clearance+0.52in

Change in height under the axle.

Width per side0.00in

On the same wheel, split inboard and outboard.

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265/45R20 or 265/50R20?

Can I use 265/50R20 instead of 265/45R20?

265/50R20 is 3.5% taller than 265/45R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 62.1 mph if the speedometer was set up for 265/45R20. Going the other way, 265/45R20 would make it read 57.9 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.52 in (+13 mm) under the axle.

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