205/70R14 vs 185/75R14 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

−1.48% diameter

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

20 mm narrower: check the tire is approved for your rim width.

Tires in 185/75R14

Check price on Amazon · 185/75R14 Best-rated 185/75R14 tires

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Measurement	205/70R14	185/75R14	Diff	%
Overall diameter	25.30″643 mm	24.93″633 mm	−0.37″	−1.5%
Section width	205.0 mm	185.0 mm	−20.0 mm	−9.8%
Sidewall height	143.5 mm	138.8 mm	−4.8 mm	−3.3%
Rim diameter	14″	14″	0″	0.0%
Circumference	79.48″2019 mm	78.30″1989 mm	−1.18″	−1.5%
Revolutions per mileturns per distance; drives the odometer	797495 /km	809503 /km	+12	+1.5%
Ride height change	—	—	−0.19″ −4.8 mm

Speedometer reading

Speedo shows

60mph

97 km/h

Actual speed

59.1mph

95 km/h

Overlay

205/70R14185/75R14

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.