tireheight.com

255/35R20 in inches

A 255/35R20 tire is 27.0″ tall and 10.0″ wide, and fits a 20″ wheel. In inches it is written 27.0×10.0R20.

Diameter27.03″
Width10.04″
Sidewall3.51″
255/35R20 drawn to scale: 27.03 inch diameter, 3.51 inch sidewall, 20 inch wheel, 10.04 inch tread width20″ wheel3.51″27.03″ overall10.04″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 255/35R20 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 20 tires in this size. Their published revolutions per mile work out to 26.2″ under load (below).

Real 255/35R20 tires measure 27.00–27.30″, against 27.03″ from the size code. Most run shorter than the size code (15 of 20).

  1. Michelin Pilot Sport All-Season 4 · 227.00–27.30″ +0.27″
  2. BFGoodrich g-Force COMP-2 A/S PLUS27.01″ −0.02″
  3. BFGoodrich g-Force Phenom T/A27.01″ −0.02″
  4. Toyo Proxes R27.01″ −0.02″
  5. Toyo Proxes Sport A/S27.01″ −0.02″
  6. Toyo Extensa HP II27.01″ −0.02″
  7. Toyo Observe G3-Ice27.01″ −0.02″
  8. Toyo Proxes R888R27.01″ −0.02″
  9. Toyo Proxes RR27.01″ −0.02″
  10. General G-MAX AS0727.00″ −0.03″
  11. Michelin Pilot Sport 427.00″ −0.03″
  12. Michelin Pilot Sport 4 S27.00″ −0.03″
  13. Michelin Pilot Sport Cup 227.00″ −0.03″
  14. Michelin Pilot Sport Cup 2 Connect · 227.00″ −0.03″
  15. Michelin Pilot Sport Cup 2 R · 327.00″ −0.03″
  16. Toyo Proxes Sport 227.00″ −0.03″
Each bar runs from the size code's 27.03″ (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 load26.2″

Published revs per mile (769–770) mean the tire rolls like a 26.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread22.9–31.8 lb

The lightest (Michelin Pilot Sport Cup 2 R, XL) is 8.9 lb lighter per corner than the heaviest (Michelin Pilot Sport Cup 2 R, XL).

20 tires in 255/35R20

Sort by the spec you care about.

LoadRevs/miSource
Michelin Pilot Sport Cup 2 RPerformanceXL · 97(Y)27.0022.95.51,609770Spec page
Michelin Pilot Sport Cup 2 RPerformanceXL · 97(Y)27.0022.95.51,609770Spec page
Michelin Pilot Sport Cup 2 ConnectPerformanceXL · 97(Y)27.0023.67.21,609770Spec page
Michelin Pilot Sport Cup 2 ConnectPerformanceXL · 97(Y)27.0023.87.21,609770Spec page
Michelin Pilot Sport 4PerformanceXL · 97Y27.0024.09.51,609770Spec page
Toyo Proxes RPerformanceSL · 93(Y)27.0125.13.61,433769Spec page
General G-MAX AS07PerformanceXL · 97W27.0025.110.01,609769Spec page
Toyo Proxes Sport 2PerformanceXL · 97(Y)27.0025.19.21,609769Spec page
Michelin Pilot Sport Cup 2PerformanceXL · 97(Y)27.0025.47.21,609770Spec page
Michelin Pilot Sport 4 SPerformanceXL · 97(Y)27.0025.89.51,609770Spec page
Toyo Extensa HP IIPerformanceXL · 97W27.0126.59.71,609769Spec page
Toyo Proxes RRPerformanceSL · (93Y)27.0127.13.61,433769Spec page
BFGoodrich g-Force Phenom T/APerformanceXL · 97Y27.0127.89.01,609770Spec page
Toyo Proxes Sport A/SPerformanceXL · 97Y27.0127.99.41,609769Spec page
Toyo Observe G3-IceWinterXL · 97T27.0128.211.31,609769Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 97Y27.3028.610.01,609770Spec page
Toyo Proxes R888RPerformanceSL · 93(Y)27.0128.96.31,433769Spec page
BFGoodrich g-Force COMP-2 A/S PLUSPerformanceXL · 97W27.0130.19.01,609770Spec page
Michelin Pilot Sport All-Season 4PerformanceXL · 97W27.0030.210.01,609770Spec page
Michelin Pilot Sport Cup 2 RPerformanceXL · 97(Y)27.0031.85.51,609770Spec page

Is 255/35R20 a 27-inch tire?

≈27″

Yes. The size code works out to 27.03″, and the 20 tires here publish 27.00–27.30″, so people call it a 27.

All 27-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 255/35R20Difference
275/30R2026.50-0.53″-2.0%
335/25R2026.59-0.43″-1.6%
285/30R2026.73-0.30″-1.1%
245/35R2026.75-0.28″-1.0%
295/30R2026.97-0.06″-0.2%
225/40R2027.09+0.06″+0.2%
305/30R2027.20+0.18″+0.7%
265/35R2027.30+0.28″+1.0%
235/40R2027.40+0.37″+1.4%
315/30R2027.44+0.41″+1.5%

How to read 255/35R20

How to read any tire size

255/35R20 97Y as printed on the tire sidewall, with each part numbered255/35R20 97Y123456
How 255/35R20 97Y is printed on the sidewall. It's the most common code among the 20 tires here (8 of them); tires in this size come in other load and speed ratings too.
1255Section width

255 mm across the widest point, or 10.04 inches. Every 255 size

235Aspect ratio

A percentage, not a measurement: the sidewall is 35% as tall as the tire is wide, which is 89.3 mm or 3.51 inches.

3RConstruction

Radial construction.

420Wheel diameter

Mounts on a 20-inch wheel. Approved wheel widths run 8.5″ to 10.0″.

597Load index

Each tire carries up to 1,609 lb (730 kg) at its maximum pressure.

6YSpeed rating

Rated for up to 186 mph sustained.

XLExtra load

Printed after the size. In this size the XL tires carry up to 1,609 lb each and the standard-load tires up to 1,433 lb, as published.

SpecificationInchesMetric
Overall diameter27.03687 mm
Section width10.04255 mm
Sidewall height3.5189.3 mm
Circumference84.92,157 mm
Revolutions per mile (calculated, unloaded)746.2464 per km
Revolutions per mile (published by manufacturers)769–770478 per km
Approved wheel width8.5–10.0216–254 mm

Speedometer error after switching to 255/35R20

Your actual speed– mph

Questions about 255/35R20

What is 255/35R20 in inches?

27.03 inches tall, 10.04 inches wide, on a 20-inch wheel. Written in inches, that is roughly 27.0×10.0R20.

How much does a 255/35R20 tire weigh?

Between 22.9 lb and 31.8 lb for the 20 tires listed here. The lightest is the Michelin Pilot Sport Cup 2 R (XL); the heaviest is the Michelin Pilot Sport Cup 2 R (XL).

What wheel width do I need for 255/35R20?

Manufacturers approve 8.5–10.0″ wide wheels for this size.

How many revolutions per mile does a 255/35R20 make?

Published figures run 769–770 revolutions per mile. The calculated figure is 746.2, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 255/35R20 than 295/30R20?

0.06 inches taller on paper (27.03″ vs 26.97″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.