235/40 R18 vs 235/35 R19

235/35 R19 stays within the configured tolerance for 235/40 R18: +0.3% diameter and +0.3% speedometer effect.

Geometric comparison

235/35 R19 stays within the configured tolerance for 235/40 R18: +0.3% diameter and +0.3% speedometer effect.

Geometric comparison
Metric	This size: 235/40 R18	Alternative: 235/35 R19	Difference	Verdict
Overall diameter	25.40 in	25.48 in	+0.3%	Within tolerance
Section width	9.25 in	9.25 in	0.00 in	Computed difference
Sidewall height	3.70 in	3.24 in	-0.46 in	Computed difference
Circumference	79.80 in	80.04 in	+0.3%	Within tolerance
Speedo	0.0%	+0.3%	+0.3%	Within tolerance

Compare sizes

Current tireLooks valid

New tireLooks valid

Market

Units

Minor variationWithin tolerance · Diameter +0.3% (+0.07 in) · US (~3%)

Minor variation · This rating covers tire geometry only, not vehicle compatibility.
Diameter +0.3% · Ride-height change +0.04 in.
Speedometer reads low · 60 mph → 60.2 mph.
Sidewall -0.46 in · Width +0.00 in.

Diameter+0.3%+0.07 in

Speedo @ 60+0.3%60 mph → 60.2 mph

Sidewall-0.46 inWidth +0.00 in

Ride-height change+0.04 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: 25.40 in 25.48 in+0.07 in
Sidewall: 3.70 in 3.24 in-0.46 in
Width: 9.25 in 9.25 in+0.00 in
Circumference: 79.80 in 80.04 in+0.3%
Revs / mile: 794 792
Speedo @ 60: 60 mph 60.2 mph+0.3%
Ride-height change: 0.00 in +0.04 in
True distance per 100 indicated: 100 mi 100.3 mi+0.3%

Current — 235/40 R18
New — 235/35 R19
Grounded to the road: the axle rises +0.04 in.

Result report

235/40 R18 235/35 R19 · Minor variation · Within tolerance

Plan budget for this size: 235/35 R19

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Plan budget for this size

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Markdown link

[235/40 R18 vs 235/35 R19 Tire size comparison](https://tirefitlab.com/tire-size-calculator/?from=235%2F40+R18&to=235%2F35+R19&market=us)

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Budget$110–$155Per tire Mid-range$145–$200Per tire Premium$205–$285Per 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 `235/40R18`	+0.0%	+0.0%

235/40 R18 · 235/35 R19 · Methodology

Technical check: 2026-06-28

What changed

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

Methodology