SidewallerTire & wheel calculators

265/35R20 vs 235/45R20

235/45R20 is 3.7% taller (+1.02 in) and 1.18 in narrower than 265/35R20.

Caution
Check before you buy

235/45R20 is 3.7% taller than 265/35R20. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.

265/35R20235/45R20Change
Diameter27.30″28.33″+1.02″+3.7%
Width10.43″9.25″−1.18″−11.3%
Sidewall3.65″4.16″+0.51″+14.0%
Circumference85.8″89.0″+3.2″+3.7%
Wheel20″20″Same
Revs per mile739712−27
SideTread
265/35R20235/45R20
Speedometer shows 60 mph62.2mph

Real speed on 235/45R20.

Ground clearance+0.51in

Change in height under the axle.

Width per side−0.59in

On the same wheel, split inboard and outboard.

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265/35R20 or 235/45R20?

Can I use 235/45R20 instead of 265/35R20?

235/45R20 is 3.7% taller than 265/35R20. 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 235/45R20 you are really doing 62.2 mph if the speedometer was set up for 265/35R20. Going the other way, 265/35R20 would make it read 57.8 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.51 in (+13 mm) under the axle.

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