TireSizesFinder

265/75R16 vs 245/75R17

245/75R17 is 0.18 in (4.6 mm) shorter than 265/75R16, a −0.57% diameter difference. With the speedometer set for 265/75R16, an indicated 60 mph is 59.7 mph on 245/75R17.

Is this a safe swap?

Diameter difference −0.57%: under 1%

By overall diameter alone, 245/75R17 is a near match for 265/75R16; 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: 265/75R16 (31.65 in) vs 245/75R17 (31.47 in)265/75R1631.65 in × 10.43 in245/75R1731.47 in × 9.65 in
Side profile and tread width, drawn to the same scale.
265/75R16 vs 245/75R17 differences
Measurement265/75R16245/75R17Difference% diff
Overall diameter31.65 in (803.9 mm)31.47 in (799.3 mm)−0.18 in (−4.6 mm)−0.57%
Sidewall height7.82 in (198.8 mm)7.23 in (183.8 mm)−0.59 in (−15.0 mm)−7.55%
Section width10.43 in (265.0 mm)9.65 in (245.0 mm)−0.79 in (−20.0 mm)−7.55%
Circumference99.43 in (2,525.5 mm)98.86 in (2,511.1 mm)−0.57 in (−14.5 mm)−0.57%
Revolutions per mile637641+4+0.58%
True speed with the speedometer calibrated for 265/75R16
IndicatedActual on 265/75R16Actual on 245/75R17Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.7 mph−0.3 mph
75 mph75.0 mph74.6 mph−0.4 mph

Ride-height change: 245/75R17 lowers the vehicle by 0.09 in (2.3 mm) at the axle (half the −4.6 mm diameter difference).

245/75R17 is 0.18 in shorter than 265/75R16 and 20 mm narrower, a 0.57% difference in overall diameter.

With the speedometer calibrated for 265/75R16, an indicated 60 mph is actually 59.7 mph on 245/75R17, and revolutions per mile change from 637 to 641.

245/75R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 265/75R16.

Size pages

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