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Sidewall

265/40R18

265 mm across the tread, a sidewall 40% of that — 106 mm — on a 18-inch rim. That puts the whole wheel at 26.3 inches tall.

106 mm sidewall669 mm · 26.3"
Sidewall
4.17"
106 mm
Overall
26.3"
669.2 mm
Circumference
82.8"
2.102 m
Revs per mile
765
per minute at 60 mph

What it needs to sit on

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It mounts on a rim between 7.5" and 9.5" wide, and the tread follows the rim: roughly 5 mm of section width for every half-inch, so about 255 mm across at the narrow end and 275 mm at the wide one. Written the way lift kits and wheel wells are, it is a 26.3×10.4R18 — 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 blowout. Yokohama is named more than any other brand.

What let goComplaints
blowout1

Where the wheel is named, 1 of 1 were on the rear, and 0 on the front.

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
255/40R1826.0" -1.2 %-4.0 mm59.3 mphside by side
275/40R1826.7" +1.2 %+4.0 mm60.7 mphside by side
245/45R1826.7" +1.3 %+4.3 mm60.8 mphside by side
285/35R1825.9" -1.9 %-6.3 mm58.9 mphside by side
245/40R1825.7" -2.4 %-8.0 mm58.6 mphside by side
285/40R1827.0" +2.4 %+8.0 mm61.4 mphside by side
255/45R1827.0" +2.6 %+8.8 mm61.6 mphside by side
275/35R1825.6" -2.9 %-9.8 mm58.3 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.


265/45R17119 mm sidewall — 13% more
265/35R1993 mm sidewall — 13% less
235/40R1994 mm sidewall — 11% less
295/40R17118 mm sidewall — 11% more
235/50R17118 mm sidewall — 11% more
275/35R1996 mm sidewall — 9% less

Tires graded in this size

Longest-lasting tread first. The grade is set by the maker and checked by regulators.


TireTreadwearWet grip
Vredestein ADVAN S.4.400AA
Yokohama ADVAN Sport280AA

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
255/40R1829.6 mph49.4 mph69.2 mph9,880
275/40R1830.4 mph50.6 mph70.8 mph10,120
245/45R1830.4 mph50.6 mph70.9 mph10,127
285/35R1829.4 mph49.1 mph68.7 mph9,813
245/40R1829.3 mph48.8 mph68.3 mph9,761