225/50R14 vs 225/45R15 tire size comparison

Change either size and everything below updates.

Start from your car make, model, year

Make Model Year

Width/AspectRRim

DiameterxWidthRRim

Width/AspectRRim

DiameterxWidthRRim

Width in mm · aspect = sidewall height as a % of width · rim in inches

Flotation (LT) sizes, all in inches: overall diameter × section width, then rim

Well within tolerance

+0.50% diameter

The overall diameter changes by less than 1.5%, so speedometer error is negligible and ride height barely moves.

Needs 15″ wheels: this tire does not fit your 14″ rims.

Tires in 225/45R15

Check price on Amazon · 225/45R15 Best-rated 225/45R15 tires

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Measurement	225/50R14	225/45R15	Diff	%
Overall diameter	22.86″581 mm	22.97″584 mm	+0.11″	+0.5%
Section width	225.0 mm	225.0 mm	0.0 mm	0.0%
Sidewall height	112.5 mm	101.3 mm	−11.3 mm	−10.0%
Rim diameter	14″	15″	+1″	+7.1%
Circumference	71.81″1824 mm	72.17″1833 mm	+0.36″	+0.5%
Revolutions per mileturns per distance; drives the odometer	882548 /km	878546 /km	−4	−0.5%
Ride height change	—	—	+0.06″ +1.4 mm

Speedometer reading

Speedo shows

60mph

97 km/h

Actual speed

60.3mph

97 km/h

Overlay

225/50R14225/45R15

How to use the tire size calculator

Put your current tire size — width, aspect ratio and rim diameter — into the first form, then your desired size into the second. You’ll get the difference between the new and the old size, plus the speedometer reading difference and your actual speed on the new set. Both metric and flotation (LT inch) sizes are supported.

The calculator helps you decide whether a set of tires and wheels will fit your car. To compare tires by brand and model instead, use our tire comparison tool; to look up factory sizes, browse by car make.