265/70 R17 vs 35x12.50 R18

What changes when you change tire size?

35x12.50 R18 is outside the configured tolerance for 265/70 R17: +10.7% diameter and +10.7% speedometer effect.

Geometric comparison

Geometric comparison
Metric This size: 265/70 R17 Alternative: 35x12.50 R18 Difference Verdict
Overall diameter 31.61 in 35.00 in +10.7% Too tall
Section width 10.43 in 12.50 in +2.07 in Computed difference
Sidewall height 7.30 in 8.50 in +1.20 in Computed difference
Circumference 99.29 in 109.96 in +10.7% Too tall
Speedo 0.0% +10.7% +10.7% Outside tolerance

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Looks valid
Looks valid
Units
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.

Not recommendedOut of tolerance · Diameter +10.7% (+3.39 in) · US preset (±3%)
  • Not recommended · This rating covers tire geometry only, not vehicle compatibility.
  • Diameter +10.7% · Ride-height change +1.70 in.
  • Speedometer reads low · 60 mph → 66.4 mph.
  • Sidewall +1.20 in · Width +2.07 in.
Diameter+10.7%+3.39 in
Speedo @ 60+10.7%60 mph → 66.4 mph
Sidewall+1.20 inWidth +2.07 in
Ride-height change+1.70 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
31.61 in 35.00 in+3.39 in
Sidewall
7.30 in 8.50 in+1.20 in
Width
10.43 in 12.50 in+2.07 in
Circumference
99.29 in 109.96 in+10.7%
Revs / mile
638 576
Speedo @ 60
60 mph 66.4 mph+10.7%
Ride-height change
0.00 in +1.70 in
True distance per 100 indicated
100 mi 110.7 mi+10.7%
Δ⌀ +3.39 inΔ↔ +2.07 in
  • Current — 265/70 R17
  • New — 35x12.50 R18
  • Grounded to the road: the axle rises +1.70 in.

Tires and wheels in one comparison

Result report

265/70 R17 35x12.50 R18 · Not recommended · Out of tolerance

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

In-tolerance alternative sizes

In-tolerance alternative sizes
SizeDiameterSpeedo @ 100Use this
−1″ 275/70R16-1.4%-1.4%
OE 265/70R17+0.0%+0.0%
+1″ 255/70R18+1.4%+1.4%
+2″ 275/60R19+1.2%+1.2%

265/70 R17 · 35x12.50 R18 · Methodology