SidewallerTire & wheel calculators

205/70R14 vs 265/35R18

265/35R18 is 0.0% taller (+0.00 in) and 2.36 in wider than 205/70R14.

OK
Same height

265/35R18 and 205/70R14 are the same overall diameter, so the speedometer stays accurate.

205/70R14265/35R18Change
Diameter25.30″25.30″+0.00″+0.0%
Width8.07″10.43″+2.36″+29.3%
Sidewall5.65″3.65″−2.00″−35.4%
Circumference79.5″79.5″+0.0″+0.0%
Wheel14″18″+4″
Revs per mile797797−0
SideTread
205/70R14265/35R18
Speedometer shows 60 mph60.0mph

Real speed on 265/35R18.

Ground clearance+0.00in

Change in height under the axle.

Width per side+1.18in

On the same wheel, split inboard and outboard.

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205/70R14 or 265/35R18?

Can I use 265/35R18 instead of 205/70R14?

265/35R18 and 205/70R14 are the same overall diameter, so the speedometer stays accurate. 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 265/35R18 you are really doing 60.0 mph if the speedometer was set up for 205/70R14. Going the other way, 205/70R14 would make it read 60.0 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.00 in (+0 mm) under the axle.

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