235/65R17 vs 255/50R19 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

+0.04% diameter

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

Needs 19″ wheels: this tire does not fit your 17″ rims.
20 mm wider: check inner clearance and that your rims are wide enough.

Tires in 255/50R19

Check price on Amazon · 255/50R19 Best-rated 255/50R19 tires

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Measurement	235/65R17	255/50R19	Diff	%
Overall diameter	29.03″737 mm	29.04″738 mm	+0.01″	+0.0%
Section width	235.0 mm	255.0 mm	+20.0 mm	+8.5%
Sidewall height	152.8 mm	127.5 mm	−25.3 mm	−16.5%
Rim diameter	17″	19″	+2″	+11.8%
Circumference	91.19″2316 mm	91.23″2317 mm	+0.04″	+0.0%
Revolutions per mileturns per distance; drives the odometer	695432 /km	695432 /km	−0	−0.0%
Ride height change	—	—	+0.01″ +0.1 mm

Speedometer reading

Speedo shows

60mph

97 km/h

Actual speed

60.0mph

97 km/h

Overlay

235/65R17255/50R19

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.