37x13.50 R20
What size is 37x13.50 R20?
37x13.50 R20 has an overall diameter of about 37.00 in, a section width of 13.50 in and a sidewall height of 8.50 in. It turns roughly 545 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.
- Overall diameter: 37.00 in.
- Section width: 13.50 in.
- Sidewall height: 8.50 in.
- Revolutions: 339 /km · 545 /mi.
Seasonal check
Planning a long summer drive?
Use the budget and running-cost tools before a trip, especially if the current tyres are worn or the replacement size changes diameter.
Specification
| Overall diameter | 37.00 in |
|---|---|
| Section width | 13.50 in |
| Sidewall height | 8.50 in |
| Circumference | 116.24 in |
| Revolutions | 339 /km · 545 /mi |
Compare sizes
Looks valid
Looks valid
Units
✓ Within toleranceDiameter +0.0% (+0.00 in) · US (~3%)
- Within tolerance · Diameter +0.0%.
- Speedo @ 60: 60 mph → 60.0 mph.
- Sidewall +0.00 in · Width +0.00 in.
Diameter+0.0%+0.00 in
Speedo @ 60+0.0%60 mph → 60.0 mph
Sidewall+0.00 inWidth +0.00 in
How this result is calculated
Computed from nominal tire-size geometry: diameter, circumference and speedometer error. It does not check wheel-arch, suspension or brake clearance.
Methodology- Diameter
- 37.00 in 37.00 in+0.00 in
- Sidewall
- 8.50 in 8.50 in+0.00 in
- Width
- 13.50 in 13.50 in+0.00 in
- Circumference
- 116.24 in 116.24 in+0.0%
- Revs / mile
- 545 545
- Speedo @ 60
- 60 mph 60.0 mph+0.0%
- Current —
37x13.50 R20 - New —
37x13.50 R20 - Grounded to the road: the axle rises +0.00 in.
Result report
37x13.50 R20 37x13.50 R20 · Within tolerance
Use this size when shopping: 37x13.50 R20
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 305/75R19 | +0.0% | +0.0% | |
OE 335/65R20 | +0.4% | +0.4% | |
+1″ 255/80R21 | +0.2% | +0.2% | |
+2″ 255/75R22 | +0.2% | +0.2% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- Section width guide
- Aspect ratio guide
- Rim diameter 20"
- Load index chart
- Speed rating chart
- Rim width and tyre fitment guide
- Wheel offset guide
- Wheel spacers guide
- Tyre pressure for heavy loads and towing
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.