TireFitLab

265/70 R16 vs 35x12.50 R20

265/70 R16 vs 35x12.50 R20

35x12.50 R20 is outside the configured tolerance for 265/70 R16: +14.4% diameter and +14.4% speedometer effect.

Fitment verdict

35x12.50 R20 is outside the configured tolerance for 265/70 R16: +14.4% diameter and +14.4% speedometer effect.

Metric This size: 265/70 R16 Alternative: 35x12.50 R20 Difference Verdict
Overall diameter 30.61 in 35.00 in +14.4% Too tall
Section width 10.43 in 12.50 in +2.07 in Computed difference
Sidewall height 7.30 in 7.50 in +0.20 in Computed difference
Circumference 96.15 in 109.96 in +14.4% Too tall
Speedo 0.0% +14.4% +14.4% Outside tolerance

Compare sizes

Looks valid
Looks valid
Units
✕ Out of toleranceDiameter +14.4% (+4.39 in) · US (~3%)
  • Out of tolerance · Diameter +14.4%.
  • Speedo @ 60: 60 mph → 68.6 mph.
  • Sidewall +0.20 in · Width +2.07 in.
Diameter+14.4%+4.39 in
Speedo @ 60+14.4%60 mph → 68.6 mph
Sidewall+0.20 inWidth +2.07 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
30.61 in 35.00 in+4.39 in
Sidewall
7.30 in 7.50 in+0.20 in
Width
10.43 in 12.50 in+2.07 in
Circumference
96.15 in 109.96 in+14.4%
Revs / mile
659 576
Speedo @ 60
60 mph 68.6 mph+14.4%
Δ⌀ +111.6 mm
  • Current — 265/70 R16
  • New — 35x12.50 R20
  • Grounded to the road: the axle rises +2.20 in.

Result report

265/70 R16 35x12.50 R20 · Out of tolerance

Use this size when shopping: 35x12.50 R20

Use this size when shopping

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

Safe alternative sizes

SizeDiameterSpeedo @ 100Use this
−1″ 305/65R15+0.0%+0.0%
OE 265/70R16+0.0%+0.0%
+1″ 345/50R17-0.1%-0.1%
+2″ 355/45R18-0.1%-0.1%

265/70 R16 · 35x12.50 R20 · Methodology

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