265/70 R16 vs 31x10.50 R15

31x10.50 R15 stays within the configured tolerance for 265/70 R16: +1.3% diameter and +1.3% speedometer effect.

Geometric comparison

31x10.50 R15 stays within the configured tolerance for 265/70 R16: +1.3% diameter and +1.3% speedometer effect.

Geometric comparison
Metric	This size: 265/70 R16	Alternative: 31x10.50 R15	Difference	Verdict
Overall diameter	30.61 in	31.00 in	+1.3%	Within tolerance
Section width	10.43 in	10.50 in	+0.07 in	Computed difference
Sidewall height	7.30 in	8.00 in	+0.70 in	Computed difference
Circumference	96.15 in	97.39 in	+1.3%	Within tolerance
Speedo	0.0%	+1.3%	+1.3%	Within tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Requires verificationWithin tolerance · Diameter +1.3% (+0.39 in) · US (~3%)

Requires verification · This rating covers tire geometry only, not vehicle compatibility.
Diameter +1.3% · Ride-height change +0.20 in.
Speedometer reads low · 60 mph → 60.8 mph.
Sidewall +0.70 in · Width +0.07 in.

Diameter+1.3%+0.39 in

Speedo @ 60+1.3%60 mph → 60.8 mph

Sidewall+0.70 inWidth +0.07 in

Ride-height change+0.20 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: 30.61 in 31.00 in+0.39 in
Sidewall: 7.30 in 8.00 in+0.70 in
Width: 10.43 in 10.50 in+0.07 in
Circumference: 96.15 in 97.39 in+1.3%
Revs / mile: 659 651
Speedo @ 60: 60 mph 60.8 mph+1.3%
Ride-height change: 0.00 in +0.20 in
True distance per 100 indicated: 100 mi 101.3 mi+1.3%

Current — 265/70 R16
New — 31x10.50 R15
Grounded to the road: the axle rises +0.20 in.

Result report

265/70 R16 31x10.50 R15 · Requires verification · Within tolerance

Plan budget for this size: 31x10.50 R15

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Plan budget for this size

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Markdown link

[265/70 R16 vs 31x10.50 R15 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=265%2F70+R16&to=31x10.50+R15&market=us)

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Budget$105–$150Per tire Mid-range$140–$200Per tire Premium$200–$285Per 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 `265/70R16`	+0.0%	+0.0%

265/70 R16 · 31x10.50 R15 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology