255/40R21 vs 255/35R22 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

−0.01% diameter

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

Needs 22″ wheels: this tire does not fit your 21″ rims.

Tires in 255/35R22

Check price on Amazon · 255/35R22 Best-rated 255/35R22 tires

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Measurement	255/40R21	255/35R22	Diff	%
Overall diameter	29.03″737 mm	29.03″737 mm	−0.00″	−0.0%
Section width	255.0 mm	255.0 mm	0.0 mm	0.0%
Sidewall height	102.0 mm	89.3 mm	−12.8 mm	−12.5%
Rim diameter	21″	22″	+1″	+4.8%
Circumference	91.21″2317 mm	91.19″2316 mm	−0.01″	−0.0%
Revolutions per mileturns per distance; drives the odometer	695432 /km	695432 /km	+0	+0.0%
Ride height change	—	—	−0.00″ −0.0 mm

Speedometer reading

Speedo shows

60mph

97 km/h

Actual speed

60.0mph

97 km/h

Overlay

255/40R21255/35R22

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.