245/70 R16 vs 35x12.50 R20

35x12.50 R20 is outside the configured tolerance for 245/70 R16: +18.6% diameter and +18.6% speedometer effect.

Geometric comparison

35x12.50 R20 is outside the configured tolerance for 245/70 R16: +18.6% diameter and +18.6% speedometer effect.

Geometric comparison
Metric	This size: 245/70 R16	Alternative: 35x12.50 R20	Difference	Verdict
Overall diameter	29.50 in	35.00 in	+18.6%	Too tall
Section width	9.65 in	12.50 in	+2.85 in	Computed difference
Sidewall height	6.75 in	7.50 in	+0.75 in	Computed difference
Circumference	92.69 in	109.96 in	+18.6%	Too tall
Speedo	0.0%	+18.6%	+18.6%	Outside tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Not recommendedOut of tolerance · Diameter +18.6% (+5.50 in) · US (~3%)

Not recommended · This rating covers tire geometry only, not vehicle compatibility.
Diameter +18.6% · Ride-height change +2.75 in.
Speedometer reads low · 60 mph → 71.2 mph.
Sidewall +0.75 in · Width +2.85 in.

Diameter+18.6%+5.50 in

Speedo @ 60+18.6%60 mph → 71.2 mph

Sidewall+0.75 inWidth +2.85 in

Ride-height change+2.75 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: 29.50 in 35.00 in+5.50 in
Sidewall: 6.75 in 7.50 in+0.75 in
Width: 9.65 in 12.50 in+2.85 in
Circumference: 92.69 in 109.96 in+18.6%
Revs / mile: 684 576
Speedo @ 60: 60 mph 71.2 mph+18.6%
Ride-height change: 0.00 in +2.75 in
True distance per 100 indicated: 100 mi 118.6 mi+18.6%

Current — 245/70 R16
New — 35x12.50 R20
Grounded to the road: the axle rises +2.75 in.

Result report

245/70 R16 35x12.50 R20 · Not recommended · Out of tolerance

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Markdown link

[245/70 R16 vs 35x12.50 R20 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=245%2F70+R16&to=35x12.50+R20&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 `245/70R16`	+0.0%	+0.0%
+1″ `265/60R17`	+0.1%	+0.1%

245/70 R16 · 35x12.50 R20 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology