TireSizesFinder

285/75R16 vs 305/65R17

305/65R17 is 0.22 in (5.6 mm) shorter than 285/75R16, a −0.67% diameter difference. With the speedometer set for 285/75R16, an indicated 60 mph is 59.6 mph on 305/65R17.

Is this a safe swap?

Diameter difference −0.67%: under 1%

By overall diameter alone, 305/65R17 is a near match for 285/75R16; 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: 285/75R16 (32.83 in) vs 305/65R17 (32.61 in)285/75R1632.83 in × 11.22 in305/65R1732.61 in × 12.01 in
Side profile and tread width, drawn to the same scale.
285/75R16 vs 305/65R17 differences
Measurement285/75R16305/65R17Difference% diff
Overall diameter32.83 in (833.9 mm)32.61 in (828.3 mm)−0.22 in (−5.6 mm)−0.67%
Sidewall height8.42 in (213.8 mm)7.81 in (198.3 mm)−0.61 in (−15.5 mm)−7.25%
Section width11.22 in (285.0 mm)12.01 in (305.0 mm)+0.79 in (+20.0 mm)+7.02%
Circumference103.14 in (2,619.8 mm)102.45 in (2,602.2 mm)−0.69 in (−17.6 mm)−0.67%
Revolutions per mile614618+4+0.68%
True speed with the speedometer calibrated for 285/75R16
IndicatedActual on 285/75R16Actual on 305/65R17Difference
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: 305/65R17 lowers the vehicle by 0.11 in (2.8 mm) at the axle (half the −5.6 mm diameter difference).

305/65R17 is 0.22 in shorter than 285/75R16 and 20 mm wider, a 0.67% difference in overall diameter.

With the speedometer calibrated for 285/75R16, an indicated 60 mph is actually 59.6 mph on 305/65R17, and revolutions per mile change from 614 to 618.

305/65R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 285/75R16.

Size pages

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