245/75R15 vs 245/65R17

245/65R17 is 0.07 in (1.8 mm) taller than 245/75R15, a +0.24% diameter difference. With the speedometer set for 245/75R15, an indicated 60 mph is 60.1 mph on 245/65R17.

Is this a safe swap?

Diameter difference +0.24%: under 1%

By overall diameter alone, 245/65R17 is a near match for 245/75R15; the speedometer changes by less than 1%. 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.

245/75R15 vs 245/65R17 differences
Measurement	245/75R15	245/65R17	Difference	% diff
Overall diameter	29.47 in (748.5 mm)	29.54 in (750.3 mm)	+0.07 in (+1.8 mm)	+0.24%
Sidewall height	7.23 in (183.8 mm)	6.27 in (159.3 mm)	−0.96 in (−24.5 mm)	−13.33%
Section width	9.65 in (245.0 mm)	9.65 in (245.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	92.58 in (2,351.5 mm)	92.80 in (2,357.1 mm)	+0.22 in (+5.7 mm)	+0.24%
Revolutions per mile	684	683	−2	−0.24%

True speed with the speedometer calibrated for 245/75R15
Indicated	Actual on 245/75R15	Actual on 245/65R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.1 mph	+0.1 mph
75 mph	75.0 mph	75.2 mph	+0.2 mph

Ride-height change: 245/65R17 raises the vehicle by 0.04 in (0.9 mm) at the axle (half the +1.8 mm diameter difference).

245/65R17 is 0.07 in taller than 245/75R15 and the same width, a 0.24% difference in overall diameter.

With the speedometer calibrated for 245/75R15, an indicated 60 mph is actually 60.1 mph on 245/65R17, and revolutions per mile change from 684 to 683.

245/65R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 245/75R15.

Size pages

Other comparisons with 245/75R15

Other comparisons with 245/65R17

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