tireheight.com275/50R21 in inches
A 275/50R21 tire is 31.8″ tall and 10.8″ wide, and fits a 21″ wheel. In inches it is written 31.8×10.8R21.
How tall 275/50R21 tires really are
Heights published by Michelin and Toyo for all 7 tires in this size. Their published revolutions per mile work out to 30.9″ under load (below).
Real 275/50R21 tires measure 31.80–31.90″, against 31.83″ from the size code. Most run taller than the size code (6 of 7).
Published revs per mile (652–653) mean the tire rolls like a 30.9″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin Primacy All Season, XL) is 18.6 lb lighter per corner than the heaviest (Michelin Defender LTX M/S 2, XL).
7 tires in 275/50R21
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin Primacy All SeasonTouring | XL · 113Y | 31.90 | 35.6 | 8.5 | 2,535 | 653 | Spec page |
| Michelin Pilot Sport 4 SUVPerformance | XL · 113V | 31.90 | 37.9 | 9.5 | 2,535 | 653 | Spec page |
| Michelin X-Ice SnowWinter | XL · 113H | 31.85 | 38.0 | 10.5 | 2,535 | 653 | Spec page |
| Michelin Pilot Alpin 5Winter | XL · 113V | 31.85 | 38.5 | 10.5 | 2,535 | 653 | Spec page |
| Toyo Open Country H/T IIHighway | XL · 113V | 31.85 | 40.3 | 11.1 | 2,535 | 652 | Spec page |
| Toyo Proxes ST IIIPerformance | XL · 113V | 31.85 | 41.1 | 10.1 | 2,535 | 652 | Spec page |
| Michelin Defender LTX M/S 2All-season | XL · 113H | 31.80 | 54.2 | 11.0 | 2,535 | 653 | Spec page |
Is 275/50R21 a 32-inch tire?
Yes. The size code works out to 31.83″, and the 7 tires here publish 31.80–31.90″, so people call it a 32.
All 32-inch tire sizes, on every wheel size.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 275/50R21
A percentage, not a measurement: the sidewall is 50% as tall as the tire is wide, which is 137.5 mm or 5.41 inches.
Radial construction.
Mounts on a 21-inch wheel. Approved wheel widths run 7.5″ to 9.5″.
Each tire carries up to 2,535 lb (1,150 kg) at its maximum pressure.
Rated for up to 149 mph sustained.
Printed after the size.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 31.83 | 808 mm |
| Section width | 10.83 | 275 mm |
| Sidewall height | 5.41 | 137.5 mm |
| Circumference | 100.0 | 2,540 mm |
| Revolutions per mile (calculated, unloaded) | 633.7 | 394 per km |
| Revolutions per mile (published by manufacturers) | 652–653 | 405–406 per km |
| Approved wheel width | 7.5–9.5 | 191–241 mm |
Speedometer error after switching to 275/50R21
Questions about 275/50R21
What is 275/50R21 in inches?
31.83 inches tall, 10.83 inches wide, on a 21-inch wheel. Written in inches, that is roughly 31.8×10.8R21.
How much does a 275/50R21 tire weigh?
Between 35.6 lb and 54.2 lb for the 7 tires listed here. The lightest is the Michelin Primacy All Season (XL); the heaviest is the Michelin Defender LTX M/S 2 (XL).
What wheel width do I need for 275/50R21?
Manufacturers approve 7.5–9.5″ wide wheels for this size.
How many revolutions per mile does a 275/50R21 make?
Published figures run 652–653 revolutions per mile. The calculated figure is 633.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 275/50R21 than 285/45R21?
0.73 inches taller on paper (31.83″ vs 31.10″), which raises the axle about 0.36″. Your speedometer will read about 2.3% slow.