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Sidewall

135/70R18

135 mm across the tread, a sidewall 70% of that — 95 mm — on a 18-inch rim. That puts the whole wheel at 25.4 inches tall.

94.5 mm sidewall646 mm · 25.4"
Sidewall
3.72"
95 mm
Overall
25.4"
646.2 mm
Circumference
79.9"
2.030 m
Revs per mile
793
per minute at 60 mph

What it needs to sit on

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It mounts on a rim between 3.5" and 5" wide, and the tread follows the rim: roughly 5 mm of section width for every half-inch, so about 128 mm across at the narrow end and 143 mm at the wide one. Written the way lift kits and wheel wells are, it is a 25.4×5.3R18 — tall by wide, in inches.

What goes wrong on this size

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1 drivers have filed a complaint. 0 of them ended in a crash, and nobody was hurt. Nobody died.

1 of them name what let go, and it is most often crack. Dunlop is named more than any other brand.

What let goComplaints
crack1

Where the wheel is named, 1 of 1 were on the front — the end that steers.

What fits instead

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Same 18-inch rim, height within 3%. Past that the speedometer starts lying and things begin to rub.


SizeHeightRide heightSpeedo reads 60, you doCompare
145/65R1825.4" -0.1 %-0.3 mm60.0 mphside by side
125/75R1825.4" -0.2 %-0.8 mm59.9 mphside by side
125/80R1825.9" +1.7 %+5.5 mm61.0 mphside by side
155/65R1825.9" +1.9 %+6.3 mm61.2 mphside by side
135/65R1824.9" -2.1 %-6.8 mm58.7 mphside by side
135/75R1826.0" +2.1 %+6.8 mm61.3 mphside by side
125/70R1824.9" -2.2 %-7.0 mm58.7 mphside by side
145/70R1826.0" +2.2 %+7.0 mm61.3 mphside by side

Same height, different rim

Bigger rim, same overall height. Sharper steering, harsher ride, and far less rubber between your wheel and the next pothole.


135/80R17108 mm sidewall — 14% more
155/70R17109 mm sidewall — 15% more
145/75R17109 mm sidewall — 15% more
155/75R16116 mm sidewall — 23% more
165/75R16124 mm sidewall — 31% more
145/80R16116 mm sidewall — 23% more

If you fit something taller

A taller tire covers more ground per turn, so the needle reads low and the odometer counts short. Over ten thousand miles on the dial, the last column is what you really drove.


Fitted insteadReads 30Reads 50Reads 70Real miles per 10,000 shown
145/65R1830.0 mph50.0 mph69.9 mph9,992
125/75R1829.9 mph49.9 mph69.8 mph9,977
125/80R1830.5 mph50.9 mph71.2 mph10,170
155/65R1830.6 mph51.0 mph71.4 mph10,193
135/65R1829.4 mph49.0 mph68.5 mph9,791