235/70 R17 vs 33x12.50 R15

33x12.50 R15 is outside the configured tolerance for 235/70 R17: +10.2% diameter and +10.2% speedometer effect.

Geometric comparison

33x12.50 R15 is outside the configured tolerance for 235/70 R17: +10.2% diameter and +10.2% speedometer effect.

Geometric comparison
Metric	This size: 235/70 R17	Alternative: 33x12.50 R15	Difference	Verdict
Overall diameter	29.95 in	33.00 in	+10.2%	Too tall
Section width	9.25 in	12.50 in	+3.25 in	Computed difference
Sidewall height	6.48 in	9.00 in	+2.52 in	Computed difference
Circumference	94.10 in	103.67 in	+10.2%	Too tall
Speedo	0.0%	+10.2%	+10.2%	Outside tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Not recommendedOut of tolerance · Diameter +10.2% (+3.05 in) · US (~3%)

Not recommended · This rating covers tire geometry only, not vehicle compatibility.
Diameter +10.2% · Ride-height change +1.52 in.
Speedometer reads low · 60 mph → 66.1 mph.
Sidewall +2.52 in · Width +3.25 in.

Diameter+10.2%+3.05 in

Speedo @ 60+10.2%60 mph → 66.1 mph

Sidewall+2.52 inWidth +3.25 in

Ride-height change+1.52 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: 29.95 in 33.00 in+3.05 in
Sidewall: 6.48 in 9.00 in+2.52 in
Width: 9.25 in 12.50 in+3.25 in
Circumference: 94.10 in 103.67 in+10.2%
Revs / mile: 673 611
Speedo @ 60: 60 mph 66.1 mph+10.2%
Ride-height change: 0.00 in +1.52 in
True distance per 100 indicated: 100 mi 110.2 mi+10.2%

Current — 235/70 R17
New — 33x12.50 R15
Grounded to the road: the axle rises +1.52 in.

Result report

235/70 R17 33x12.50 R15 · Not recommended · Out of tolerance

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Markdown link

[235/70 R17 vs 33x12.50 R15 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=235%2F70+R17&to=33x12.50+R15&market=us)

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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 `235/70R17`	+0.0%	+0.0%

235/70 R17 · 33x12.50 R15 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology