31x10.50 R15 vs 265/70 R17

265/70 R17 stays within the configured tolerance for 31x10.50 R15: +2.0% diameter and +2.0% speedometer effect.

Geometric comparison

265/70 R17 stays within the configured tolerance for 31x10.50 R15: +2.0% diameter and +2.0% speedometer effect.

Geometric comparison
Metric	This size: 31x10.50 R15	Alternative: 265/70 R17	Difference	Verdict
Overall diameter	31.00 in	31.61 in	+2.0%	Within tolerance
Section width	10.50 in	10.43 in	-0.07 in	Computed difference
Sidewall height	8.00 in	7.30 in	-0.70 in	Computed difference
Circumference	97.39 in	99.29 in	+2.0%	Within tolerance
Speedo	0.0%	+2.0%	+2.0%	Within tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Requires verificationWithin tolerance · Diameter +2.0% (+0.61 in) · US (~3%)

Requires verification · This rating covers tire geometry only, not vehicle compatibility.
Diameter +2.0% · Ride-height change +0.30 in.
Speedometer reads low · 60 mph → 61.2 mph.
Sidewall -0.70 in · Width -0.07 in.

Diameter+2.0%+0.61 in

Speedo @ 60+2.0%60 mph → 61.2 mph

Sidewall-0.70 inWidth -0.07 in

Ride-height change+0.30 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: 31.00 in 31.61 in+0.61 in
Sidewall: 8.00 in 7.30 in-0.70 in
Width: 10.50 in 10.43 in-0.07 in
Circumference: 97.39 in 99.29 in+2.0%
Revs / mile: 651 638
Speedo @ 60: 60 mph 61.2 mph+2.0%
Ride-height change: 0.00 in +0.30 in
True distance per 100 indicated: 100 mi 102.0 mi+2.0%

Current — 31x10.50 R15
New — 265/70 R17
Grounded to the road: the axle rises +0.30 in.

Result report

31x10.50 R15 265/70 R17 · Requires verification · Within tolerance

Plan budget for this size: 265/70 R17

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Plan budget for this size

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Markdown link

[31x10.50 R15 vs 265/70 R17 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=31x10.50+R15&to=265%2F70+R17&market=us)

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Budget$80–$115Per tire Mid-range$110–$150Per tire Premium$155–$215Per tire

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

In-tolerance alternative sizes

In-tolerance alternative sizes
Size	Diameter	Speedo @ 100	Use this
OE `255/80R15`	+0.2%	+0.2%

31x10.50 R15 · 265/70 R17 · Methodology

Technical check: 2026-06-28

What changed

Checked generated routes, metadata, sitemap inclusion and localized page rendering.

Methodology