265/70 R17 vs 275/65 R18

275/65 R18 stays within the configured tolerance for 265/70 R17: +1.5% diameter and +1.5% speedometer effect.

Geometric comparison

275/65 R18 stays within the configured tolerance for 265/70 R17: +1.5% diameter and +1.5% speedometer effect.

Geometric comparison
Metric	This size: 265/70 R17	Alternative: 275/65 R18	Difference	Verdict
Overall diameter	31.61 in	32.07 in	+1.5%	Within tolerance
Section width	10.43 in	10.83 in	+0.39 in	Computed difference
Sidewall height	7.30 in	7.04 in	-0.27 in	Computed difference
Circumference	99.29 in	100.77 in	+1.5%	Within tolerance
Speedo	0.0%	+1.5%	+1.5%	Within tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Minor variationWithin tolerance · Diameter +1.5% (+0.47 in) · US (~3%)

Minor variation · This rating covers tire geometry only, not vehicle compatibility.
Diameter +1.5% · Ride-height change +0.23 in.
Speedometer reads low · 60 mph → 60.9 mph.
Sidewall -0.27 in · Width +0.39 in.

Diameter+1.5%+0.47 in

Speedo @ 60+1.5%60 mph → 60.9 mph

Sidewall-0.27 inWidth +0.39 in

Ride-height change+0.23 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: 31.61 in 32.07 in+0.47 in
Sidewall: 7.30 in 7.04 in-0.27 in
Width: 10.43 in 10.83 in+0.39 in
Circumference: 99.29 in 100.77 in+1.5%
Revs / mile: 638 629
Speedo @ 60: 60 mph 60.9 mph+1.5%
Ride-height change: 0.00 in +0.23 in
True distance per 100 indicated: 100 mi 101.5 mi+1.5%

Current — 265/70 R17
New — 275/65 R18
Grounded to the road: the axle rises +0.23 in.

Result report

265/70 R17 275/65 R18 · Minor variation · Within tolerance

Plan budget for this size: 275/65 R18

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Plan budget for this size

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Markdown link

[265/70 R17 vs 275/65 R18 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=265%2F70+R17&to=275%2F65+R18&market=us)

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Budget$120–$170Per tire Mid-range$160–$225Per tire Premium$230–$320Per 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 `265/70R17`	+0.0%	+0.0%

265/70 R17 · 275/65 R18 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology