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 plus/minus sizes that stay within the selected diameter tolerance.

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What this geometry means

37x13.50 R20 has a taller-sidewall proportion. The marking directly specifies a 37.00 in nominal overall diameter, a 13.50 in section and a 20-inch rim. One sidewall is 8.50 in; both sidewalls make up 46% of the diameter, while the rim makes up 54%.

At the nominal 116.24 in circumference, 1,000 rotations cover 2.95 km (1.83 mi); the inverse rates are 339/km and 545/mi.

This is a nominal geometry comparison only. Vehicle clearance, wheel width and offset, load and speed ratings, and manufacturer approval still require separate checks.

Specification

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

No different size remains in this curated set after the active filters. This is a limited catalogue, not proof that no alternative exists. Compare an exact candidate from the vehicle or tyre manufacturer’s documentation; diameter similarity alone does not approve fitment.

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Editorial preset

These are TireFitLab editorial diameter-screening presets. Regional names choose a preset, not a national legal limit, ETRTO rule or vehicle approval. The AWD preset does not establish an allowable drivetrain mismatch. Use the exact vehicle and tyre manufacturer instructions; nominal geometry alone cannot approve fitment.

Very close matchWithin tolerance · Diameter +0.0% (+0.00 in) · US preset (±3%)
  • Very close match · This rating covers tire geometry only, not vehicle compatibility.
  • Diameter +0.0% · Ride-height change +0.00 in.
  • Speedometer unchanged · 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
Ride-height change+0.00 inDiameter ÷ 2
How this result is calculated

Computed from nominal tire-size geometry: diameter, circumference and speedometer error. It does not check vehicle placard approval, load/speed rating, rim-width range, wheel-arch, suspension or brake clearance.

Methodology

Before fitting

  • Check the vehicle placard and owner’s manual first.
  • Match or exceed the required load index and speed rating.
  • Confirm rim-width range, bolt pattern, hub bore, offset and fasteners.
  • Inspect wheel-arch, suspension and brake clearance under real vehicle load.
  • Check TPMS, cold pressure and local roadworthiness rules.
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%
Ride-height change
0.00 in +0.00 in
True distance per 100 indicated
100 mi 100.0 mi+0.0%
Δ⌀ +0.00 inΔ↔ +0.00 in
  • Current — 37x13.50 R20
  • New — 37x13.50 R20
  • Grounded to the road: the axle rises +0.00 in.

Tires and wheels in one comparison

Result report

37x13.50 R20 37x13.50 R20 · Very close match · Within tolerance

Plan budget for this size: 37x13.50 R20

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Plan budget for this size
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Estimated budgetBudget$215–$300Per tireMid-range$280–$395Per tirePremium$395–$560Per tire

Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.

In-tolerance alternative sizes

In-tolerance alternative sizes
SizeDiameterSpeedo @ 100Use this
−1″ 345/65R19-0.9%-0.9%
OE 335/65R20+0.4%+0.4%
+1″ 345/60R21+0.8%+0.8%
+2″ 335/60R22+2.2%+2.2%

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Last reviewed: 2026-09-04