tireheight.com305/70R17 in inches
A 305/70R17 tire is 33.8″ tall and 12.0″ wide, and fits a 17″ wheel. In inches it is written 33.8×12.0R17.
How tall 305/70R17 tires really are
Heights published by BFGoodrich and Toyo for all 3 tires in this size. Their published revolutions per mile work out to 32.8″ under load (below).
Real 305/70R17 tires measure 33.86–33.90″, against 33.81″ from the size code. Every one runs taller than the size code.
Published revs per mile (614) mean the tire rolls like a 32.8″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Toyo Open Country A/T III, LT E) is 3.5 lb lighter per corner than the heaviest (BFGoodrich All-Terrain T/A KO3, LT F).
3 tires in 305/70R17
Sort by the spec you care about.
Is 305/70R17 a 34-inch tire?
Yes. The size code works out to 33.81″, and the 3 tires here publish 33.86–33.90″, so people call it a 34.
All 34-inch tire sizes, on every wheel size.
A true 34×10.50R17 is 0.19″ taller on paper and 1.5″ narrower.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
| Size | Diameter ″ | vs 305/70R17 | Difference |
|---|---|---|---|
| 33×12.50R17 | 33.00 | -0.81″ | -2.4% |
| 33×15.50R17 | 33.00 | -0.81″ | -2.4% |
| 255/80R17 | 33.06 | -0.75″ | -2.2% |
| 295/70R17 | 33.26 | -0.55″ | -1.6% |
| 285/70R18 | 33.71 | -0.10″ | -0.3% |
| 285/75R17 | 33.83 | +0.02″ | +0.1% |
| 34×10.50R17 | 34.00 | +0.19″ | +0.6% |
| 255/85R17 | 34.07 | +0.26″ | +0.8% |
| 315/70R17 | 34.36 | +0.55″ | +1.6% |
| 295/75R17 | 34.42 | +0.61″ | +1.8% |
How to read 305/70R17
Marks a light truck (LT) tire.
A percentage, not a measurement: the sidewall is 70% as tall as the tire is wide, which is 213.5 mm or 8.41 inches.
Radial construction.
Mounts on a 17-inch wheel. Approved wheel widths run 8.0″ to 10.0″.
Each tire carries up to 3,970 lb (1,800 kg) at its maximum pressure.
Rated for up to 112 mph sustained.
Printed separately as "LOAD RANGE F": a 12-ply rating, inflated up to 95 psi (standard load-range table). The load range F tires here carry up to 3,970 lb each, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 33.81 | 859 mm |
| Section width | 12.01 | 305 mm |
| Sidewall height | 8.41 | 213.5 mm |
| Circumference | 106.2 | 2,698 mm |
| Revolutions per mile (calculated, unloaded) | 596.5 | 371 per km |
| Revolutions per mile (published by manufacturers) | 614 | 382 per km |
| Approved wheel width | 8.0–10.0 | 203–254 mm |
Speedometer error after switching to 305/70R17
Questions about 305/70R17
What is 305/70R17 in inches?
33.81 inches tall, 12.01 inches wide, on a 17-inch wheel. Written in inches, that is roughly 33.8×12.0R17.
How much does a 305/70R17 tire weigh?
Between 64.2 lb and 67.7 lb for the 3 tires listed here. The lightest is the Toyo Open Country A/T III (LT E); the heaviest is the BFGoodrich All-Terrain T/A KO3 (LT F).
What wheel width do I need for 305/70R17?
Manufacturers approve 8.0–10.0″ wide wheels for this size.
How many revolutions per mile does a 305/70R17 make?
Published figures run 614 revolutions per mile. The calculated figure is 596.5, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 305/70R17 than 295/70R17?
0.55 inches taller on paper (33.81″ vs 33.26″), which raises the axle about 0.28″. Your speedometer will read about 1.7% slow.