My Tire Guide

275/55R18 tire size

A 275/55R18 tire stands 29.9 inches tall and 10.8 inches wide, with a 6.0-inch sidewall on an 18-inch rim.

29.9″OVERALL 29.9 IN · RIM 18 IN10.8″6.0″WIDTH · SIDEWALL
Overall height
29.9 in760 mm
Section width
10.8 in275 mm
Sidewall height
6.0 in151 mm
Rim diameter
18 in457 mm
Circumference
94.0 in2387 mm
Revolutions per mile
674419 per km
Inch size
29.9x10.8R18

Compare it with any other size in the tire size calculator.

Sizes you can swap to

These 18-inch sizes are within two width steps and 3% of a 275/55R18's overall height, the usual limit before the speedometer, ABS and transmission notice. The closest is 255/60R18, 0.5% taller (0.14 in). Wider sizes also need room in the wheel well and a rim width that suits them.

SizeHeightWidthAt 60 mph
255/60R18+0.5%+0.14 in−20 mm60.3 mph
295/50R18−1.0%−0.30 in+20 mm59.4 mph
265/55R18−1.4%−0.43 in−10 mm59.1 mph
285/55R18+1.4%+0.43 in+10 mm60.9 mph
265/60R18+2.0%+0.61 in−10 mm61.2 mph
285/50R18−2.3%−0.69 in+10 mm58.6 mph
295/55R18+2.9%+0.87 in+20 mm61.7 mph
255/55R18−2.9%−0.87 in−20 mm58.3 mph

Plus and minus sizes

Changing rim size means changing the sidewall to keep the same overall height. On 16-inch or 17-inch or 19-inch or 20-inch rims, these are the closest matches to a 275/55R18.

SizeHeightWidthAt 60 mph
295/60R16+0.1%+0.03 in+20 mm60.1 mph
275/60R17+0.3%+0.08 in±0 mm60.2 mph
275/50R19−0.3%−0.08 in±0 mm59.8 mph
255/50R20+0.4%+0.13 in−20 mm60.3 mph

Other 18-inch sizes near 275/55R18

275 mm wide, other sidewalls

55 series, other widths

See the other sizes for this rim on 18-inch tire sizes.

Shop 275/55R18 tires

These open each store's own list of 275/55R18 tires, where you can filter by type, load and speed rating.

275/55R18 questions

How tall is a 275/55R18 tire?

About 29.9 inches (760 mm) from the ground to the top of the tread, unloaded. On the vehicle, carrying weight, it sits a little lower.

What does 275/55R18 mean?

275 is the section width in millimetres (10.8 in). 55 means the sidewall is 55% of that width: 151 mm, or 6.0 in. R means radial construction, and 18 is the rim diameter in inches.

Can I use 255/60R18 instead of 275/55R18?

255/60R18 is 0.5% taller (0.14 in) and 20 mm narrower, which is inside the usual 3% rule. With it fitted, the speedometer shows 60 mph when you are doing 60.3 mph.

What is 275/55R18 in inches?

In inch terms it is 29.9x10.8R18: 29.9 inches tall, 10.8 inches wide, for an 18-inch rim.

How many revolutions per mile does a 275/55R18 make?

About 674 turns per mile, worked out from its unloaded circumference of 94.0 inches. Makers list slightly higher numbers for their own tires, because a loaded tire rolls on a smaller radius.