285/60 R18 vs 265/70 R17

265/70 R17 stays within the configured tolerance for 285/60 R18: +0.5% diameter and +0.5% speedometer effect.

Geometric comparison

265/70 R17 stays within the configured tolerance for 285/60 R18: +0.5% diameter and +0.5% speedometer effect.

Geometric comparison
Metric	This size: 285/60 R18	Alternative: 265/70 R17	Difference	Verdict
Overall diameter	31.46 in	31.61 in	+0.5%	Within tolerance
Section width	11.22 in	10.43 in	-0.79 in	Computed difference
Sidewall height	6.73 in	7.30 in	+0.57 in	Computed difference
Circumference	98.85 in	99.29 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% (+0.14 in) · US (~3%)

Requires verification · This rating covers tire geometry only, not vehicle compatibility.
Diameter +0.5% · Ride-height change +0.07 in.
Speedometer reads low · 60 mph → 60.3 mph.
Sidewall +0.57 in · Width -0.79 in.

Diameter+0.5%+0.14 in

Speedo @ 60+0.5%60 mph → 60.3 mph

Sidewall+0.57 inWidth -0.79 in

Ride-height change+0.07 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: 31.46 in 31.61 in+0.14 in
Sidewall: 6.73 in 7.30 in+0.57 in
Width: 11.22 in 10.43 in-0.79 in
Circumference: 98.85 in 99.29 in+0.5%
Revs / mile: 641 638
Speedo @ 60: 60 mph 60.3 mph+0.5%
Ride-height change: 0.00 in +0.07 in
True distance per 100 indicated: 100 mi 100.5 mi+0.5%

Current — 285/60 R18
New — 265/70 R17
Grounded to the road: the axle rises +0.07 in.

Result report

285/60 R18 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

[285/60 R18 vs 265/70 R17 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=285%2F60+R18&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 `285/60R18`	+0.0%	+0.0%
+1″ `265/60R19`	+0.2%	+0.2%

285/60 R18 · 265/70 R17 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology