tireheight.com

275/55R20 in inches

A 275/55R20 tire is 31.9″ tall and 10.8″ wide, and fits a 20″ wheel. In inches it is written 31.9×10.8R20.

Diameter31.91″
Width10.83″
Sidewall5.95″
275/55R20 drawn to scale: 31.91 inch diameter, 5.95 inch sidewall, 20 inch wheel, 10.83 inch tread width20″ wheel5.95″31.91″ overall10.83″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 275/55R20 tires really are

Heights published by BFGoodrich, General, Michelin, Mickey Thompson and Toyo for all 38 tires in this size. Their published revolutions per mile work out to 30.9–31.2″ under load (below).

Real 275/55R20 tires measure 31.89–32.30″, against 31.91″ from the size code. They run both taller and shorter than the size code.

  1. Mickey Thompson Baja Legend EXP32.30″ +0.39″
  2. Mickey Thompson Baja Boss A/T · 232.20″ +0.29″
  3. Toyo Open Country M/T32.13″ +0.22″
  4. Toyo Open Country C/T32.13″ +0.22″
  5. BFGoodrich All-Terrain T/A KO331.90″ −0.01″
  6. BFGoodrich Trail-Terrain T/A31.90″ −0.01″
  7. BFGoodrich Trail-Terrain T/A+31.90″ −0.01″
  8. General G-MAX AS0731.90″ −0.01″
  9. General G-MAX Justice31.90″ −0.01″
  10. General G-MAX Justice AW31.90″ −0.01″
  11. General Grabber A/TSport-W31.90″ −0.01″
  12. General Grabber A/TX · 231.90″ −0.01″
  13. General Grabber APT31.90″ −0.01″
  14. General Grabber Arctic X31.90″ −0.01″
  15. General Grabber H/T · 231.90″ −0.01″
  16. General Grabber HTS6031.90″ −0.01″
  17. Michelin Defender LTX M/S 231.90″ −0.01″
  18. Michelin LTX A/T231.90″ −0.01″
  19. Michelin LTX M/S231.90″ −0.01″
  20. Michelin Primacy All Season31.90″ −0.01″
  21. Toyo Open Country A/T III EV · 231.90″ −0.01″
  22. BFGoodrich Advantage Control HT31.89″ −0.02″
  23. BFGoodrich Elite-Force T/A31.89″ −0.02″
  24. Michelin X-Ice Snow31.89″ −0.02″
  25. Toyo Celsius II31.89″ −0.02″
  26. Toyo Open Country A/T III · 231.89″ −0.02″
  27. Toyo Open Country R/T Trail31.89″ −0.02″
  28. Toyo Proxes G-Tour31.89″ −0.02″
  29. Toyo Celsius CUV31.89″ −0.02″
  30. Toyo Observe G3-Ice31.89″ −0.02″
  31. Toyo Open Country H/T II31.89″ −0.02″
  32. Toyo OPEN COUNTRY Q/T31.89″ −0.02″
  33. Toyo Proxes ST III31.89″ −0.02″
Each bar runs from the size code's 31.91″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.
Height under load30.9–31.2″

Published revs per mile (647–652) mean the tire rolls like a 30.9–31.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread34.6–64.3 lb

The lightest (Michelin Primacy All Season, XL) is 29.7 lb lighter per corner than the heaviest (Toyo Open Country M/T, LT D).

38 tires in 275/55R20

Sort by the spec you care about.

LoadRevs/miSource
Michelin Primacy All SeasonTouringXL · 117W31.9034.68.52,833652Spec page
Michelin LTX M/S2All-seasonSL · 113H31.9037.410.52,304652Spec page
General Grabber H/THighwayXL · 117T31.9037.712.02,833651Spec page
General Grabber H/THighwayXL · 117H31.9037.712.02,833651Spec page
General Grabber HTS60TouringXL · 117T31.9037.712.02,833651Spec page
General G-MAX AS07PerformanceXL · 117V31.9038.111.02,833651Spec page
General Grabber Arctic XWinterXL · 117T31.9038.212.02,833651Spec page
General G-MAX JusticePerformanceSL · 113V31.9039.011.02,535651Spec page
Michelin X-Ice SnowWinterSL · 113T31.8939.010.52,535652Spec page
Michelin Defender LTX M/S 2All-seasonXL · 117T31.9039.112.52,833652Spec page
General G-MAX Justice AWAll-weatherSL · 113V31.9039.311.02,535651Spec page
Michelin LTX A/T2All-terrainSL · 113T31.9040.514.02,304652Spec page
Toyo Proxes ST IIIPerformanceXL · 117V31.8941.110.12,833651Spec page
Toyo Open Country A/T IIIAll-terrainXL · 117T31.8941.613.52,833651Spec page
Toyo Celsius CUVAll-weatherXL · 117V31.8941.911.32,833651Spec page
Toyo Observe G3-IceWinterXL · 117T31.8941.912.02,833651Spec page
Toyo Proxes G-TourXL · 117V31.8942.312.22,833651Spec page
Toyo Celsius IITouringXL · 117V31.8942.511.72,833651Spec page
Toyo Open Country H/T IIHighwayXL · 117H31.8942.711.22,833651Spec page
Toyo Open Country R/T TrailRugged-terrainXL · 117T31.8942.813.52,833651Spec page
BFGoodrich Elite-Force T/AAll-seasonXL · 117V31.8943.310.52,833652Spec page
General Grabber A/TSport-WAll-terrainSL · 113T31.9043.712.02,535651Spec page
General Grabber A/TXAll-terrainSL · 113T31.9043.714.02,535651Spec page
Toyo Open Country A/T III EVAll-terrainXL · 117H31.9043.713.52,833651Spec page
Toyo OPEN COUNTRY Q/TAll-seasonXL · 117H31.8944.113.02,833651Spec page
General Grabber APTAll-terrainXL · 117T31.9044.314.02,833651Spec page
BFGoodrich Advantage Control HTHighwaySL · 113T31.8945.612.02,535652Spec page
BFGoodrich Trail-Terrain T/AAll-terrainSL · 113T31.9045.812.52,535652Spec page
BFGoodrich Trail-Terrain T/A+XL · 117T31.9047.012.52,833652Spec page
Mickey Thompson Baja Boss A/TAll-terrainXL · 117T32.2048.016.02,833–Spec page
Toyo Open Country A/T IIIAll-terrainLT E · 120/117T31.8950.216.43,085651Spec page
General Grabber A/TXAll-terrainLT D · 115T31.9052.015.02,680651Spec page
Toyo Open Country A/T III EVAll-terrainLT E · 120/117S31.9053.116.43,085651Spec page
BFGoodrich All-Terrain T/A KO3All-terrainLT D · 115S31.9056.115.02,680652Spec page
Mickey Thompson Baja Legend EXPAll-terrainLT E · 120Q32.3057.018.53,085–Spec page
Toyo Open Country C/TCommercialLT D · 115/112Q32.1361.618.42,680647Spec page
Mickey Thompson Baja Boss A/TAll-terrainLT E · 120Q32.2063.018.53,085–Spec page
Toyo Open Country M/TMud-terrainLT D · 115/112P32.1364.319.12,680647Spec page

Is 275/55R20 a 32-inch tire?

≈32″

Yes. The size code works out to 31.91″, and the 38 tires here publish 31.89–32.30″, 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.

SizeDiameter ″vs 275/55R20Difference
255/55R2031.04-0.87″-2.7%
235/60R2031.10-0.81″-2.5%
285/50R2031.22-0.69″-2.2%
265/55R2031.48-0.43″-1.4%
245/60R2031.57-0.33″-1.0%
275/50R2131.83-0.08″-0.3%
305/50R2032.01+0.10″+0.3%
255/60R2032.05+0.14″+0.4%
285/55R2032.34+0.43″+1.4%
265/60R2032.52+0.61″+1.9%

How to read 275/55R20

How to read any tire size

275/55R20 117T as printed on the tire sidewall, with each part numbered275/55R20 117T123456
How 275/55R20 117T is printed on the sidewall. It's the most common code among the 38 tires here (10 of them); tires in this size come in other load and speed ratings too.
1275Section width

275 mm across the widest point, or 10.83 inches. Every 275 size

255Aspect ratio

A percentage, not a measurement: the sidewall is 55% as tall as the tire is wide, which is 151.3 mm or 5.95 inches.

3RConstruction

Radial construction.

420Wheel diameter

Mounts on a 20-inch wheel. Approved wheel widths run 7.5″ to 9.5″.

5117Load index

Each tire carries up to 2,833 lb (1,285 kg) at its maximum pressure.

6TSpeed rating

Rated for up to 118 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 2,833 lb each and the standard-load tires up to 2,535 lb, as published.

SpecificationInchesMetric
Overall diameter31.91810 mm
Section width10.83275 mm
Sidewall height5.95151.3 mm
Circumference100.22,546 mm
Revolutions per mile (calculated, unloaded)632.0393 per km
Revolutions per mile (published by manufacturers)647–652402–405 per km
Approved wheel width7.5–9.5191–241 mm

Speedometer error after switching to 275/55R20

Your actual speed– mph

Questions about 275/55R20

What is 275/55R20 in inches?

31.91 inches tall, 10.83 inches wide, on a 20-inch wheel. Written in inches, that is roughly 31.9×10.8R20.

How much does a 275/55R20 tire weigh?

Between 34.6 lb and 64.3 lb for the 38 tires listed here. The lightest is the Michelin Primacy All Season (XL); the heaviest is the Toyo Open Country M/T (LT D).

What wheel width do I need for 275/55R20?

Manufacturers approve 7.5–9.5″ wide wheels for this size.

How many revolutions per mile does a 275/55R20 make?

Published figures run 647–652 revolutions per mile. The calculated figure is 632.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.

What is the difference between P275/55R20 and LT275/55R20?

Passenger tires (30 here) are built for passenger loads, with max loads of 2304–2833 lb. Light-truck tires (8 here) come in heavier load ranges with max loads of 2680–3085 lb, and are usually heavier with deeper tread.

How much taller is 275/55R20 than 245/60R20?

0.33 inches taller on paper (31.91″ vs 31.57″), which raises the axle about 0.17″. Your speedometer will read about 1.1% slow.