225/60 R16 vs 245/45 R18

245/45 R18 stays within the configured tolerance for 225/60 R16: +0.2% diameter and +0.2% speedometer effect.

Fitment verdict

245/45 R18 stays within the configured tolerance for 225/60 R16: +0.2% diameter and +0.2% speedometer effect.

Metric	This size: 225/60 R16	Alternative: 245/45 R18	Difference	Verdict
Overall diameter	26.63 in	26.68 in	+0.2%	Within tolerance
Section width	8.86 in	9.65 in	+0.79 in	Computed difference
Sidewall height	5.31 in	4.34 in	-0.97 in	Computed difference
Circumference	83.66 in	83.82 in	+0.2%	Within tolerance
Speedo	0.0%	+0.2%	+0.2%	Within tolerance

Current tireLooks valid

New tireLooks valid

Market

Units

✓ Within toleranceDiameter +0.2% (+0.05 in) · US (~3%)

Diameter+0.2%+0.05 in

Speedo @ 60+0.2%60 mph → 60.1 mph

Sidewall-0.97 inWidth +0.79 in

How this result is calculated

Computed from nominal tire-size geometry: diameter, circumference and speedometer error. It does not check wheel-arch, suspension or brake clearance.

225/60 R16 245/45 R18 · Within tolerance

Use this size when shopping: 245/45 R18

Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.

Size	Diameter	Speedo @ 100
−1″ `295/50R15`	-0.1%	-0.1%
OE `225/60R16`	+0.0%	+0.0%
+1″ `175/70R17`	+0.1%	+0.1%
+2″ `275/40R18`	+0.1%	+0.1%

What changed

Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.