TireFitLab

31x10.50 R16 vs 275/70 R18

31x10.50 R16 vs 275/70 R18

275/70 R18 is outside the configured tolerance for 31x10.50 R16: +7.0% diameter and +7.0% speedometer effect.

Fitment verdict

275/70 R18 is outside the configured tolerance for 31x10.50 R16: +7.0% diameter and +7.0% speedometer effect.

Metric This size: 31x10.50 R16 Alternative: 275/70 R18 Difference Verdict
Overall diameter 31.00 in 33.16 in +7.0% Too tall
Section width 10.50 in 10.83 in +0.33 in Computed difference
Sidewall height 7.50 in 7.58 in +0.08 in Computed difference
Circumference 97.39 in 104.17 in +7.0% Too tall
Speedo 0.0% +7.0% +7.0% Outside tolerance

Compare sizes

Looks valid
Looks valid
Units
✕ Out of toleranceDiameter +7.0% (+2.16 in) · US (~3%)
  • Out of tolerance · Diameter +7.0%.
  • Speedo @ 60: 60 mph → 64.2 mph.
  • Sidewall +0.08 in · Width +0.33 in.
Diameter+7.0%+2.16 in
Speedo @ 60+7.0%60 mph → 64.2 mph
Sidewall+0.08 inWidth +0.33 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
31.00 in 33.16 in+2.16 in
Sidewall
7.50 in 7.58 in+0.08 in
Width
10.50 in 10.83 in+0.33 in
Circumference
97.39 in 104.17 in+7.0%
Revs / mile
651 608
Speedo @ 60
60 mph 64.2 mph+7.0%
Δ⌀ +54.8 mm
  • Current — 31x10.50 R16
  • New — 275/70 R18
  • Grounded to the road: the axle rises +1.08 in.

Result report

31x10.50 R16 275/70 R18 · Out of tolerance

Use this size when shopping: 275/70 R18

Use this size when shopping

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

Safe alternative sizes

SizeDiameterSpeedo @ 100Use this
−1″ 255/80R15+0.2%+0.2%
OE 255/75R16+0.2%+0.2%
+1″ 355/50R17-0.1%-0.1%
+2″ 275/60R18-0.0%-0.0%

31x10.50 R16 · 275/70 R18 · Methodology

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