265/65 R18 vs 265/70 R17

265/70 R17 stays within the configured tolerance for 265/65 R18: +0.1% diameter and +0.1% speedometer effect.

Geometric comparison

265/70 R17 stays within the configured tolerance for 265/65 R18: +0.1% diameter and +0.1% speedometer effect.

Geometric comparison
Metric	This size: 265/65 R18	Alternative: 265/70 R17	Difference	Verdict
Overall diameter	31.56 in	31.61 in	+0.1%	Within tolerance
Section width	10.43 in	10.43 in	0.00 in	Computed difference
Sidewall height	6.78 in	7.30 in	+0.52 in	Computed difference
Circumference	99.16 in	99.29 in	+0.1%	Within tolerance
Speedo	0.0%	+0.1%	+0.1%	Within tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Requires verificationWithin tolerance · Diameter +0.1% (+0.04 in) · US (~3%)

Requires verification · This rating covers tire geometry only, not vehicle compatibility.
Diameter +0.1% · Ride-height change +0.02 in.
Speedometer reads low · 60 mph → 60.1 mph.
Sidewall +0.52 in · Width +0.00 in.

Diameter+0.1%+0.04 in

Speedo @ 60+0.1%60 mph → 60.1 mph

Sidewall+0.52 inWidth +0.00 in

Ride-height change+0.02 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: 31.56 in 31.61 in+0.04 in
Sidewall: 6.78 in 7.30 in+0.52 in
Width: 10.43 in 10.43 in+0.00 in
Circumference: 99.16 in 99.29 in+0.1%
Revs / mile: 639 638
Speedo @ 60: 60 mph 60.1 mph+0.1%
Ride-height change: 0.00 in +0.02 in
True distance per 100 indicated: 100 mi 100.1 mi+0.1%

Current — 265/65 R18
New — 265/70 R17
Grounded to the road: the axle rises +0.02 in.

Result report

265/65 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

[265/65 R18 vs 265/70 R17 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=265%2F65+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
−1″ `285/65R17`	+0.1%	+0.1%
OE `265/65R18`	+0.0%	+0.0%

265/65 R18 · 265/70 R17 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology