TireFitLab

245/70 R16 vs 31x10.50 R15

245/70 R16 vs 31x10.50 R15

31x10.50 R15 is outside the configured tolerance for 245/70 R16: +5.1% diameter and +5.1% speedometer effect.

Fitment verdict

31x10.50 R15 is outside the configured tolerance for 245/70 R16: +5.1% diameter and +5.1% speedometer effect.

Metric This size: 245/70 R16 Alternative: 31x10.50 R15 Difference Verdict
Overall diameter 29.50 in 31.00 in +5.1% Too tall
Section width 9.65 in 10.50 in +0.85 in Computed difference
Sidewall height 6.75 in 8.00 in +1.25 in Computed difference
Circumference 92.69 in 97.39 in +5.1% Too tall
Speedo 0.0% +5.1% +5.1% Outside tolerance

Compare sizes

Looks valid
Looks valid
Units
✕ Out of toleranceDiameter +5.1% (+1.50 in) · US (~3%)
  • Out of tolerance · Diameter +5.1%.
  • Speedo @ 60: 60 mph → 63.0 mph.
  • Sidewall +1.25 in · Width +0.85 in.
Diameter+5.1%+1.50 in
Speedo @ 60+5.1%60 mph → 63.0 mph
Sidewall+1.25 inWidth +0.85 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
29.50 in 31.00 in+1.50 in
Sidewall
6.75 in 8.00 in+1.25 in
Width
9.65 in 10.50 in+0.85 in
Circumference
92.69 in 97.39 in+5.1%
Revs / mile
684 651
Speedo @ 60
60 mph 63.0 mph+5.1%
Δ⌀ +38.0 mm
  • Current — 245/70 R16
  • New — 31x10.50 R15
  • Grounded to the road: the axle rises +0.75 in.

Result report

245/70 R16 31x10.50 R15 · Out of tolerance

Use this size when shopping: 31x10.50 R15

Use this size when shopping

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

Safe alternative sizes

SizeDiameterSpeedo @ 100Use this
−1″ 335/55R15+0.0%+0.0%
OE 245/70R16+0.0%+0.0%
+1″ 265/60R17+0.1%+0.1%
+2″ 195/75R18+0.0%+0.0%

245/70 R16 · 31x10.50 R15 · Methodology

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