TireSizesFinder

255/70R16 vs 225/75R17

225/75R17 is 0.23 in (5.9 mm) taller than 255/70R16, a +0.77% diameter difference. With the speedometer set for 255/70R16, an indicated 60 mph is 60.5 mph on 225/75R17.

Is this a safe swap?

Diameter difference +0.77%: under 1%

By overall diameter alone, 225/75R17 is a near match for 255/70R16; 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: 255/70R16 (30.06 in) vs 225/75R17 (30.29 in)255/70R1630.06 in × 10.04 in225/75R1730.29 in × 8.86 in
Side profile and tread width, drawn to the same scale.
255/70R16 vs 225/75R17 differences
Measurement255/70R16225/75R17Difference% diff
Overall diameter30.06 in (763.4 mm)30.29 in (769.3 mm)+0.23 in (+5.9 mm)+0.77%
Sidewall height7.03 in (178.5 mm)6.64 in (168.8 mm)−0.38 in (−9.7 mm)−5.46%
Section width10.04 in (255.0 mm)8.86 in (225.0 mm)−1.18 in (−30.0 mm)−11.76%
Circumference94.42 in (2,398.3 mm)95.15 in (2,416.8 mm)+0.73 in (+18.5 mm)+0.77%
Revolutions per mile671666−5−0.77%
True speed with the speedometer calibrated for 255/70R16
IndicatedActual on 255/70R16Actual on 225/75R17Difference
30 mph30.0 mph30.2 mph+0.2 mph
60 mph60.0 mph60.5 mph+0.5 mph
75 mph75.0 mph75.6 mph+0.6 mph

Ride-height change: 225/75R17 raises the vehicle by 0.12 in (2.9 mm) at the axle (half the +5.9 mm diameter difference).

225/75R17 is 0.23 in taller than 255/70R16 and 30 mm narrower, a 0.77% difference in overall diameter.

With the speedometer calibrated for 255/70R16, an indicated 60 mph is actually 60.5 mph on 225/75R17, and revolutions per mile change from 671 to 666.

225/75R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 255/70R16.

Size pages

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