SidewallerTire & wheel calculators

225/35R20 vs 245/35R20

245/35R20 is 2.1% taller (+0.55 in) and 0.79 in wider than 225/35R20.

OK
Close match

245/35R20 is 2.1% taller than 225/35R20. That is inside the ±3% most shops treat as a straight swap.

225/35R20245/35R20Change
Diameter26.20″26.75″+0.55″+2.1%
Width8.86″9.65″+0.79″+8.9%
Sidewall3.10″3.38″+0.28″+8.9%
Circumference82.3″84.0″+1.7″+2.1%
Wheel20″20″Same
Revs per mile770754−16
SideTread
225/35R20245/35R20
Speedometer shows 60 mph61.3mph

Real speed on 245/35R20.

Ground clearance+0.28in

Change in height under the axle.

Width per side+0.39in

On the same wheel, split inboard and outboard.

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225/35R20 or 245/35R20?

Can I use 245/35R20 instead of 225/35R20?

245/35R20 is 2.1% taller than 225/35R20. 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 245/35R20 you are really doing 61.3 mph if the speedometer was set up for 225/35R20. Going the other way, 225/35R20 would make it read 58.8 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.28 in (+7 mm) under the axle.

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