215/65 R16 vs 255/40 R19

255/40 R19 stays within the configured tolerance for 215/65 R16: +0.1% diameter and +0.1% speedometer effect.

Geometric comparison

255/40 R19 stays within the configured tolerance for 215/65 R16: +0.1% diameter and +0.1% speedometer effect.

Geometric comparison
Metric	This size: 215/65 R16	Alternative: 255/40 R19	Difference	Verdict
Overall diameter	27.00 in	27.03 in	+0.1%	Within tolerance
Section width	8.46 in	10.04 in	+1.57 in	Computed difference
Sidewall height	5.50 in	4.02 in	-1.49 in	Computed difference
Circumference	84.84 in	84.92 in	+0.1%	Within tolerance
Speedo	0.0%	+0.1%	+0.1%	Within tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

High fitment riskWithin tolerance · Diameter +0.1% (+0.03 in) · US (~3%)

High fitment risk · This rating covers tire geometry only, not vehicle compatibility.
Diameter +0.1% · Ride-height change +0.01 in.
Speedometer reads low · 60 mph → 60.1 mph.
Sidewall -1.49 in · Width +1.57 in.

Diameter+0.1%+0.03 in

Speedo @ 60+0.1%60 mph → 60.1 mph

Sidewall-1.49 inWidth +1.57 in

Ride-height change+0.01 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: 27.00 in 27.03 in+0.03 in
Sidewall: 5.50 in 4.02 in-1.49 in
Width: 8.46 in 10.04 in+1.57 in
Circumference: 84.84 in 84.92 in+0.1%
Revs / mile: 747 746
Speedo @ 60: 60 mph 60.1 mph+0.1%
Ride-height change: 0.00 in +0.01 in
True distance per 100 indicated: 100 mi 100.1 mi+0.1%

Current — 215/65 R16
New — 255/40 R19
Grounded to the road: the axle rises +0.01 in.

Result report

215/65 R16 255/40 R19 · High fitment risk · Within tolerance

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Markdown link

[215/65 R16 vs 255/40 R19 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=215%2F65+R16&to=255%2F40+R19&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 `215/65R16`	+0.0%	+0.0%
+1″ `195/65R17`	-0.1%	-0.1%

215/65 R16 · 255/40 R19 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology