TireFitLab

275/45 R22 vs 37x13.50 R20

275/45 R22 vs 37x13.50 R20

37x13.50 R20 is outside the configured tolerance for 275/45 R22: +16.6% diameter and +16.6% speedometer effect.

Fitment verdict

37x13.50 R20 is outside the configured tolerance for 275/45 R22: +16.6% diameter and +16.6% speedometer effect.

Metric This size: 275/45 R22 Alternative: 37x13.50 R20 Difference Verdict
Overall diameter 31.74 in 37.00 in +16.6% Too tall
Section width 10.83 in 13.50 in +2.67 in Computed difference
Sidewall height 4.87 in 8.50 in +3.63 in Computed difference
Circumference 99.73 in 116.24 in +16.6% Too tall
Speedo 0.0% +16.6% +16.6% Outside tolerance

Compare sizes

Looks valid
Looks valid
Units
✕ Out of toleranceDiameter +16.6% (+5.26 in) · US (~3%)
  • Out of tolerance · Diameter +16.6%.
  • Speedo @ 60: 60 mph → 69.9 mph.
  • Sidewall +3.63 in · Width +2.67 in.
Diameter+16.6%+5.26 in
Speedo @ 60+16.6%60 mph → 69.9 mph
Sidewall+3.63 inWidth +2.67 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
31.74 in 37.00 in+5.26 in
Sidewall
4.87 in 8.50 in+3.63 in
Width
10.83 in 13.50 in+2.67 in
Circumference
99.73 in 116.24 in+16.6%
Revs / mile
635 545
Speedo @ 60
60 mph 69.9 mph+16.6%
Δ⌀ +133.5 mm
  • Current — 275/45 R22
  • New — 37x13.50 R20
  • Grounded to the road: the axle rises +2.63 in.

Result report

275/45 R22 37x13.50 R20 · Out of tolerance

Use this size when shopping: 37x13.50 R20

Use this size when shopping

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

Safe alternative sizes

SizeDiameterSpeedo @ 100Use this
−1″ 195/70R21+0.0%+0.0%
OE 275/45R22+0.0%+0.0%
+1″ 185/60R23-0.0%-0.0%
+2″ 245/40R24-0.1%-0.1%

275/45 R22 · 37x13.50 R20 · Methodology

Last reviewed: 2026-06-28
What changed
  • Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.