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Tire size

255/70R18 tire size: dimensions explained

Factory size on the Jeep Wrangler (JL). Below are the dimensions calculated from the size marking itself. Your vehicle's correct size, load index and speed rating are on the placard in the driver's door jamb; check it before buying.

MeasurementMetricImperial
Section width255 mm10.04 in
Sidewall height178.5 mm7.03 in
Overall diameter814.2 mm32.06 in
Wheel diameter457.2 mm18 in
Circumference2558 mm100.7 in
Revolutions per mile629

Calculated values: diameter = wheel + 2 × (width × aspect ratio). Real tires vary slightly by brand and model.

Reading the marking

255 is the section width in millimetres, 70 is the sidewall height as a percentage of that width, R means radial construction, and 18 is the wheel diameter in inches. A passenger (P or Euro-metric) tire and an LT tire in the same size are not interchangeable without checking load requirements.

Compare 255/70R18 with another size →

255/70R18 tires at Tire Rack

Highway / touring

TireLoad/speedPrice per tire
Laufenn X FIT HT
Highway All-Season		113H$157.99View at Tire Rack
Advanta SVT Plus
Crossover/SUV Touring All-Season		113T$164.46View at Tire Rack

All-terrain

TireLoad/speedPrice per tire
Radar Renegade A/T Pro
On-Road All-Terrain		XL 116T$175.00View at Tire Rack
Advanta ATX-850
Off-Road All-Terrain Truck		113T$175.18View at Tire Rack

Winter

TireLoad/speedPrice per tire
Goodyear WinterCommand (SUV)
Light Truck/SUV Studdable Snow Truck		113S$144.10View at Tire Rack
Bridgestone Blizzak IcePeak
Studless Ice & Snow		113S$241.99View at Tire Rack

Rugged / mud-terrain

TireLoad/speedPrice per tire
Kumho Road Venture RT
Rugged All-Terrain		XL 116T$244.00View at Tire Rack
Cooper Discoverer Rugged Trek
Rugged All-Terrain		XL 116T$270.99View at Tire Rack

Showing the lowest-priced in-stock options in each category from 61 255/70R18 tires in Tire Rack's feed, sorted by price only. We don't rank by commission. Match or exceed the load index and speed rating on your placard.

Affiliate links: if you buy through a Tire Rack link, RightTread may earn a commission through CJ. It doesn't change your price. Prices are Tire Rack's per-tire prices from Tire Rack's product feed as of Nov 7, 2026, 9:19 PM PT. Prices change, so confirm on Tire Rack before you buy. Disclosure

Other sizes