TireSizesFinder

225/75R14 vs 205/75R15

205/75R15 is 0.18 in (4.6 mm) shorter than 225/75R14, a −0.66% diameter difference. With the speedometer set for 225/75R14, an indicated 60 mph is 59.6 mph on 205/75R15.

Is this a safe swap?

Diameter difference −0.66%: under 1%

By overall diameter alone, 205/75R15 is a near match for 225/75R14; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 225/75R14 (27.29 in) vs 205/75R15 (27.11 in)225/75R1427.29 in × 8.86 in205/75R1527.11 in × 8.07 in
Side profile and tread width, drawn to the same scale.
225/75R14 vs 205/75R15 differences
Measurement225/75R14205/75R15Difference% diff
Overall diameter27.29 in (693.1 mm)27.11 in (688.5 mm)−0.18 in (−4.6 mm)−0.66%
Sidewall height6.64 in (168.8 mm)6.05 in (153.8 mm)−0.59 in (−15.0 mm)−8.89%
Section width8.86 in (225.0 mm)8.07 in (205.0 mm)−0.79 in (−20.0 mm)−8.89%
Circumference85.73 in (2,177.4 mm)85.16 in (2,163.0 mm)−0.57 in (−14.5 mm)−0.66%
Revolutions per mile739744+5+0.67%
True speed with the speedometer calibrated for 225/75R14
IndicatedActual on 225/75R14Actual on 205/75R15Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.5 mph−0.5 mph

Ride-height change: 205/75R15 lowers the vehicle by 0.09 in (2.3 mm) at the axle (half the −4.6 mm diameter difference).

205/75R15 is 0.18 in shorter than 225/75R14 and 20 mm narrower, a 0.66% difference in overall diameter.

With the speedometer calibrated for 225/75R14, an indicated 60 mph is actually 59.6 mph on 205/75R15, and revolutions per mile change from 739 to 744.

205/75R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 225/75R14.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.