245/75R15 vs 275/60R17

275/60R17 is 0.52 in (13.3 mm) taller than 245/75R15, a +1.78% diameter difference. With the speedometer set for 245/75R15, an indicated 60 mph is 61.1 mph on 275/60R17.

Is this a safe swap?

Diameter difference +1.78%: within the ±3% guideline

By overall diameter alone, 275/60R17 falls inside the ±3% range commonly used as a guideline when replacing 245/75R15. 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 275/60R17 differences
Measurement	245/75R15	275/60R17	Difference	% diff
Overall diameter	29.47 in (748.5 mm)	29.99 in (761.8 mm)	+0.52 in (+13.3 mm)	+1.78%
Sidewall height	7.23 in (183.8 mm)	6.50 in (165.0 mm)	−0.74 in (−18.7 mm)	−10.20%
Section width	9.65 in (245.0 mm)	10.83 in (275.0 mm)	+1.18 in (+30.0 mm)	+12.24%
Circumference	92.58 in (2,351.5 mm)	94.22 in (2,393.3 mm)	+1.65 in (+41.8 mm)	+1.78%
Revolutions per mile	684	672	−12	−1.75%

True speed with the speedometer calibrated for 245/75R15
Indicated	Actual on 245/75R15	Actual on 275/60R17	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.1 mph	+1.1 mph
75 mph	75.0 mph	76.3 mph	+1.3 mph

Ride-height change: 275/60R17 raises the vehicle by 0.26 in (6.6 mm) at the axle (half the +13.3 mm diameter difference).

275/60R17 is 0.52 in taller than 245/75R15 and 30 mm wider, a 1.78% difference in overall diameter.

With the speedometer calibrated for 245/75R15, an indicated 60 mph is actually 61.1 mph on 275/60R17, and revolutions per mile change from 684 to 672.

275/60R17 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 275/60R17

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