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Sidewall

285/40R23

285 mm across the tread, a sidewall 40% of that — 114 mm — on a 23-inch rim. That puts the whole wheel at 32.0 inches tall.

114 mm sidewall812 mm · 32.0"
Sidewall
4.49"
114 mm
Overall
32.0"
812.2 mm
Circumference
100.5"
2.552 m
Revs per mile
631
per minute at 60 mph

What it needs to sit on

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It mounts on a rim between 8" and 10.5" wide, and the tread follows the rim: roughly 5 mm of section width for every half-inch, so about 273 mm across at the narrow end and 298 mm at the wide one. Written the way lift kits and wheel wells are, it is a 32.0×11.2R23 — 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 tread separation. Nitto is named more than any other brand.

What let goComplaints
tread separation1

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


SizeHeightRide heightSpeedo reads 60, you doCompare
275/40R2331.7" -1.0 %-4.0 mm59.4 mphside by side
295/40R2332.3" +1.0 %+4.0 mm60.6 mphside by side
265/45R2332.4" +1.3 %+5.3 mm60.8 mphside by side
305/35R2331.4" -1.8 %-7.3 mm58.9 mphside by side
265/40R2331.3" -2.0 %-8.0 mm58.8 mphside by side
305/40R2332.6" +2.0 %+8.0 mm61.2 mphside by side
275/45R2332.7" +2.4 %+9.8 mm61.4 mphside by side
295/35R2331.1" -2.6 %-10.8 mm58.4 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.


315/40R22126 mm sidewall — 11% more
255/40R24102 mm sidewall — 11% less
255/50R22128 mm sidewall — 12% more
285/35R24100 mm sidewall — 13% less
285/45R22128 mm sidewall — 13% more
295/35R24103 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
MICHELIN Pilot Sport All Season 4540A
Yokohama Parada Spec-X420A

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
275/40R2329.7 mph49.5 mph69.3 mph9,902
295/40R2330.3 mph50.5 mph70.7 mph10,098
265/45R2330.4 mph50.6 mph70.9 mph10,129
305/35R2329.5 mph49.1 mph68.8 mph9,821
265/40R2329.4 mph49.0 mph68.6 mph9,803