285/75 R16 vs 33x12.50 R15

33x12.50 R15 stays within the configured tolerance for 285/75 R16: +0.5% diameter and +0.5% speedometer effect.

Geometric comparison

33x12.50 R15 stays within the configured tolerance for 285/75 R16: +0.5% diameter and +0.5% speedometer effect.

Geometric comparison
Metric	This size: 285/75 R16	Alternative: 33x12.50 R15	Difference	Verdict
Overall diameter	32.83 in	33.00 in	+0.5%	Within tolerance
Section width	11.22 in	12.50 in	+1.28 in	Computed difference
Sidewall height	8.42 in	9.00 in	+0.58 in	Computed difference
Circumference	103.14 in	103.67 in	+0.5%	Within tolerance
Speedo	0.0%	+0.5%	+0.5%	Within tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Requires verificationWithin tolerance · Diameter +0.5% (+0.17 in) · US (~3%)

Requires verification · This rating covers tire geometry only, not vehicle compatibility.
Diameter +0.5% · Ride-height change +0.08 in.
Speedometer reads low · 60 mph → 60.3 mph.
Sidewall +0.58 in · Width +1.28 in.

Diameter+0.5%+0.17 in

Speedo @ 60+0.5%60 mph → 60.3 mph

Sidewall+0.58 inWidth +1.28 in

Ride-height change+0.08 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: 32.83 in 33.00 in+0.17 in
Sidewall: 8.42 in 9.00 in+0.58 in
Width: 11.22 in 12.50 in+1.28 in
Circumference: 103.14 in 103.67 in+0.5%
Revs / mile: 614 611
Speedo @ 60: 60 mph 60.3 mph+0.5%
Ride-height change: 0.00 in +0.08 in
True distance per 100 indicated: 100 mi 100.5 mi+0.5%

Current — 285/75 R16
New — 33x12.50 R15
Grounded to the road: the axle rises +0.08 in.

Result report

285/75 R16 33x12.50 R15 · Requires verification · Within tolerance

Plan budget for this size: 33x12.50 R15

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Plan budget for this size

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Markdown link

[285/75 R16 vs 33x12.50 R15 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=285%2F75+R16&to=33x12.50+R15&market=us)

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Budget$130–$185Per tire Mid-range$170–$240Per tire Premium$245–$345Per 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 `285/75R16`	+0.0%	+0.0%

285/75 R16 · 33x12.50 R15 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology