255/70R16 vs 255/75R17 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

Outside the 3% rule

+6.67% diameter

This exceeds the tolerance most manufacturers allow. Expect speedometer error, possible rubbing, and on some cars ABS or stability-control faults.

Needs 17″ wheels: this tire does not fit your 16″ rims.

Check what fits your car Factory tire sizes for every make, model and year.

Tires in 255/75R17

Check price on Amazon · 255/75R17 Best-rated 255/75R17 tires

TireWheelGuide may earn a commission from purchases made through these links.

Measurement	255/70R16	255/75R17	Diff	%
Overall diameter	30.06″763 mm	32.06″814 mm	+2.00″	+6.7%
Section width	255.0 mm	255.0 mm	0.0 mm	0.0%
Sidewall height	178.5 mm	191.3 mm	+12.8 mm	+7.1%
Rim diameter	16″	17″	+1″	+6.3%
Circumference	94.42″2398 mm	100.72″2558 mm	+6.30″	+6.7%
Revolutions per mileturns per distance; drives the odometer	671417 /km	629391 /km	−42	−6.3%
Ride height change	—	—	+1.00″ +25.4 mm

Speedometer reading

Speedo shows

60mph

97 km/h

Actual speed

64.0mph

103 km/h

Overlay

255/70R16255/75R17

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.