tireheight.com305/35R20 in inches
A 305/35R20 tire is 28.4″ tall and 12.0″ wide, and fits a 20″ wheel. In inches it is written 28.4×12.0R20.
How tall 305/35R20 tires really are
Heights published by BFGoodrich, General, Michelin and Toyo for all 9 tires in this size. Their published revolutions per mile work out to 27.6″ under load (below).
Real 305/35R20 tires measure 28.40–28.43″, against 28.41″ from the size code. They run both taller and shorter than the size code.
Published revs per mile (731–732) mean the tire rolls like a 27.6″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin Pilot Sport Cup 2 R, XL) is 10.4 lb lighter per corner than the heaviest (BFGoodrich g-Force COMP-2 A/S PLUS, SL).
9 tires in 305/35R20
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin Pilot Sport Cup 2 RPerformance | XL · 107(Y) | 28.40 | 27.6 | 5.5 | 2,149 | 732 | Spec page |
| Michelin Pilot Sport 4 SPerformance | XL · 107(Y) | 28.40 | 29.9 | 9.0 | 2,149 | 732 | Spec page |
| Michelin Pilot Sport Cup 2 ConnectPerformance | XL · 107(Y) | 28.40 | 30.4 | 7.2 | 2,149 | 732 | Spec page |
| General G-MAX RSPerformance | SL · 104Y | 28.40 | 30.7 | 10.0 | 1,984 | 731 | Spec page |
| General G-MAX AS07Performance | XL · 107W | 28.40 | 31.1 | 10.0 | 2,149 | 731 | Spec page |
| Michelin Pilot Sport 4 SPerformance | SL · 104(Y) | 28.40 | 31.7 | 9.5 | 1,984 | 732 | Spec page |
| Michelin Pilot Sport All-Season 4Performance | XL · 107Y | 28.40 | 33.3 | 10.0 | 2,149 | 732 | Spec page |
| Toyo Proxes R888RPerformance | SL · 104(Y) | 28.43 | 35.0 | 6.3 | 1,984 | 731 | Spec page |
| BFGoodrich g-Force COMP-2 A/S PLUSPerformance | SL · 104Y | 28.43 | 38.0 | 9.0 | 1,984 | 732 | Spec page |
Is 305/35R20 a 28-inch tire?
Close. The size code works out to 28.41″, and the 9 tires here publish 28.40–28.43″, so people call it a 28.
All 28-inch tire sizes, on every wheel size.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 305/35R20
A percentage, not a measurement: the sidewall is 35% as tall as the tire is wide, which is 106.8 mm or 4.20 inches.
Radial construction.
Mounts on a 20-inch wheel. Approved wheel widths run 10.0″ to 12.0″.
Each tire carries up to 2,149 lb (975 kg) at its maximum pressure.
Rated for up to 186 mph sustained.
Printed after the size. In this size the XL tires carry up to 2,149 lb each and the standard-load tires up to 1,984 lb, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 28.41 | 722 mm |
| Section width | 12.01 | 305 mm |
| Sidewall height | 4.20 | 106.8 mm |
| Circumference | 89.2 | 2,267 mm |
| Revolutions per mile (calculated, unloaded) | 710.0 | 441 per km |
| Revolutions per mile (published by manufacturers) | 731–732 | 454–455 per km |
| Approved wheel width | 10.0–12.0 | 254–305 mm |
Speedometer error after switching to 305/35R20
Questions about 305/35R20
What is 305/35R20 in inches?
28.41 inches tall, 12.01 inches wide, on a 20-inch wheel. Written in inches, that is roughly 28.4×12.0R20.
How much does a 305/35R20 tire weigh?
Between 27.6 lb and 38.0 lb for the 9 tires listed here. The lightest is the Michelin Pilot Sport Cup 2 R (XL); the heaviest is the BFGoodrich g-Force COMP-2 A/S PLUS (SL).
What wheel width do I need for 305/35R20?
Manufacturers approve 10.0–12.0″ wide wheels for this size.
How many revolutions per mile does a 305/35R20 make?
Published figures run 731–732 revolutions per mile. The calculated figure is 710.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 305/35R20 than 265/40R20?
0.06 inches taller on paper (28.41″ vs 28.35″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.