tireheight.com

235/50R21 in inches

A 235/50R21 tire is 30.3″ tall and 9.3″ wide, and fits a 21″ wheel. In inches it is written 30.3×9.3R21.

Diameter30.25″
Width9.25″
Sidewall4.63″
235/50R21 drawn to scale: 30.25 inch diameter, 4.63 inch sidewall, 21 inch wheel, 9.25 inch tread width21″ wheel4.63″30.25″ overall9.25″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 235/50R21 tires really are

Heights published by Michelin for all 3 tires in this size. Their published revolutions per mile work out to 29.4″ under load (below).

Real 235/50R21 tires measure 30.28″, against 30.25″ from the size code. Every one runs taller than the size code.

Height under load29.4″

Published revs per mile (687) mean the tire rolls like a 29.4″ tire on the vehicle. Use this for speedometer calibration.

Weight spread29.7–34.1 lb

The lightest (Michelin CrossClimate2, SL) is 4.4 lb lighter per corner than the heaviest (Michelin X-Ice Snow, SL).

3 tires in 235/50R21

Sort by the spec you care about.

LoadRevs/miSource
Michelin CrossClimate2All-seasonSL · 101V30.2829.710.01,819687Spec page
Michelin X-Ice Snow+WinterXL · 104H30.2832.610.51,984687Spec page
Michelin X-Ice SnowWinterSL · 101H30.2834.110.51,819687Spec page

Is 235/50R21 a 30-inch tire?

≈30″

Yes. The size code works out to 30.25″, and the 3 tires here publish 30.28″, so people call it a 30.

All 30-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 235/50R21Difference
275/40R2129.66-0.59″-2.0%
245/45R2129.68-0.57″-1.9%
315/35R2129.68-0.57″-1.9%
285/40R2129.98-0.28″-0.9%
255/45R2130.04-0.22″-0.7%
295/40R2130.29+0.04″+0.1%
265/45R2130.39+0.14″+0.5%
305/40R2130.61+0.35″+1.2%
275/45R2130.74+0.49″+1.6%
315/40R2130.92+0.67″+2.2%

How to read 235/50R21

How to read any tire size

235/50R21 101V as printed on the tire sidewall, with each part numbered235/50R21 101V123456
How 235/50R21 101V is printed on the sidewall. It's the most common code among the 3 tires here (1 of them); tires in this size come in other load and speed ratings too.
1235Section width

235 mm across the widest point, or 9.25 inches. Every 235 size

250Aspect ratio

A percentage, not a measurement: the sidewall is 50% as tall as the tire is wide, which is 117.5 mm or 4.63 inches.

3RConstruction

Radial construction.

421Wheel diameter

Mounts on a 21-inch wheel. Approved wheel widths run 6.5″ to 8.5″.

5101Load index

Each tire carries up to 1,819 lb (825 kg) at its maximum pressure.

6VSpeed rating

Rated for up to 149 mph sustained.

SpecificationInchesMetric
Overall diameter30.25768 mm
Section width9.25235 mm
Sidewall height4.63117.5 mm
Circumference95.02,414 mm
Revolutions per mile (calculated, unloaded)666.7414 per km
Revolutions per mile (published by manufacturers)687427 per km
Approved wheel width6.5–8.5165–216 mm

Speedometer error after switching to 235/50R21

Your actual speed– mph

Questions about 235/50R21

What is 235/50R21 in inches?

30.25 inches tall, 9.25 inches wide, on a 21-inch wheel. Written in inches, that is roughly 30.3×9.3R21.

How much does a 235/50R21 tire weigh?

Between 29.7 lb and 34.1 lb for the 3 tires listed here. The lightest is the Michelin CrossClimate2 (SL); the heaviest is the Michelin X-Ice Snow (SL).

What wheel width do I need for 235/50R21?

Manufacturers approve 6.5–8.5″ wide wheels for this size.

How many revolutions per mile does a 235/50R21 make?

Published figures run 687 revolutions per mile. The calculated figure is 666.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 235/50R21 than 255/45R21?

0.22 inches taller on paper (30.25″ vs 30.04″), which raises the axle about 0.11″. Your speedometer will read about 0.7% slow.