235/75R16 vs 245/65R17

245/65R17 is 0.34 in (8.6 mm) shorter than 235/75R16, a −1.13% diameter difference. With the speedometer set for 235/75R16, an indicated 60 mph is 59.3 mph on 245/65R17.

Is this a safe swap?

Diameter difference −1.13%: within the ±3% guideline

By overall diameter alone, 245/65R17 falls inside the ±3% range commonly used as a guideline when replacing 235/75R16. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

235/75R16 vs 245/65R17 differences
Measurement	235/75R16	245/65R17	Difference	% diff
Overall diameter	29.88 in (758.9 mm)	29.54 in (750.3 mm)	−0.34 in (−8.6 mm)	−1.13%
Sidewall height	6.94 in (176.3 mm)	6.27 in (159.3 mm)	−0.67 in (−17.0 mm)	−9.65%
Section width	9.25 in (235.0 mm)	9.65 in (245.0 mm)	+0.39 in (+10.0 mm)	+4.26%
Circumference	93.86 in (2,384.2 mm)	92.80 in (2,357.1 mm)	−1.06 in (−27.0 mm)	−1.13%
Revolutions per mile	675	683	+8	+1.15%

True speed with the speedometer calibrated for 235/75R16
Indicated	Actual on 235/75R16	Actual on 245/65R17	Difference
30 mph	30.0 mph	29.7 mph	−0.3 mph
60 mph	60.0 mph	59.3 mph	−0.7 mph
75 mph	75.0 mph	74.2 mph	−0.8 mph

Ride-height change: 245/65R17 lowers the vehicle by 0.17 in (4.3 mm) at the axle (half the −8.6 mm diameter difference).

245/65R17 is 0.34 in shorter than 235/75R16 and 10 mm wider, a 1.13% difference in overall diameter.

With the speedometer calibrated for 235/75R16, an indicated 60 mph is actually 59.3 mph on 245/65R17, and revolutions per mile change from 675 to 683.

245/65R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 235/75R16.

Size pages

Other comparisons with 235/75R16

Other comparisons with 245/65R17

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.