225/55 R17 vs 255/40 R19

255/40 R19 stays within the configured tolerance for 225/55 R17: +1.1% diameter and +1.1% speedometer effect.

Geometric comparison

255/40 R19 stays within the configured tolerance for 225/55 R17: +1.1% diameter and +1.1% speedometer effect.

Geometric comparison
Metric	This size: 225/55 R17	Alternative: 255/40 R19	Difference	Verdict
Overall diameter	26.74 in	27.03 in	+1.1%	Within tolerance
Section width	8.86 in	10.04 in	+1.18 in	Computed difference
Sidewall height	4.87 in	4.02 in	-0.86 in	Computed difference
Circumference	84.02 in	84.92 in	+1.1%	Within tolerance
Speedo	0.0%	+1.1%	+1.1%	Within tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Requires verificationWithin tolerance · Diameter +1.1% (+0.29 in) · US (~3%)

Requires verification · This rating covers tire geometry only, not vehicle compatibility.
Diameter +1.1% · Ride-height change +0.14 in.
Speedometer reads low · 60 mph → 60.6 mph.
Sidewall -0.86 in · Width +1.18 in.

Diameter+1.1%+0.29 in

Speedo @ 60+1.1%60 mph → 60.6 mph

Sidewall-0.86 inWidth +1.18 in

Ride-height change+0.14 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: 26.74 in 27.03 in+0.29 in
Sidewall: 4.87 in 4.02 in-0.86 in
Width: 8.86 in 10.04 in+1.18 in
Circumference: 84.02 in 84.92 in+1.1%
Revs / mile: 754 746
Speedo @ 60: 60 mph 60.6 mph+1.1%
Ride-height change: 0.00 in +0.14 in
True distance per 100 indicated: 100 mi 101.1 mi+1.1%

Current — 225/55 R17
New — 255/40 R19
Grounded to the road: the axle rises +0.14 in.

Result report

225/55 R17 255/40 R19 · Requires verification · Within tolerance

Plan budget for this size: 255/40 R19

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Plan budget for this size

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Markdown link

[225/55 R17 vs 255/40 R19 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=225%2F55+R17&to=255%2F40+R19&market=us)

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Budget$125–$175Per tire Mid-range$160–$230Per tire Premium$230–$325Per 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″ `195/70R16`	+0.0%	+0.0%
OE `225/55R17`	+0.0%	+0.0%

225/55 R17 · 255/40 R19 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology