235/60R17 vs 245/60R17

245/60R17 is 0.47 in (12.0 mm) taller than 235/60R17, a +1.68% diameter difference. With the speedometer set for 235/60R17, an indicated 60 mph is 61.0 mph on 245/60R17.

Is this a safe swap?

Diameter difference +1.68%: within the ±3% guideline

By overall diameter alone, 245/60R17 falls inside the ±3% range commonly used as a guideline when replacing 235/60R17. 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.

235/60R17 vs 245/60R17 differences
Measurement	235/60R17	245/60R17	Difference	% diff
Overall diameter	28.10 in (713.8 mm)	28.57 in (725.8 mm)	+0.47 in (+12.0 mm)	+1.68%
Sidewall height	5.55 in (141.0 mm)	5.79 in (147.0 mm)	+0.24 in (+6.0 mm)	+4.26%
Section width	9.25 in (235.0 mm)	9.65 in (245.0 mm)	+0.39 in (+10.0 mm)	+4.26%
Circumference	88.29 in (2,242.5 mm)	89.77 in (2,280.2 mm)	+1.48 in (+37.7 mm)	+1.68%
Revolutions per mile	718	706	−12	−1.65%

True speed with the speedometer calibrated for 235/60R17
Indicated	Actual on 235/60R17	Actual on 245/60R17	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	61.0 mph	+1.0 mph
75 mph	75.0 mph	76.3 mph	+1.3 mph

Ride-height change: 245/60R17 raises the vehicle by 0.24 in (6.0 mm) at the axle (half the +12.0 mm diameter difference).

245/60R17 is 0.47 in taller than 235/60R17 and 10 mm wider, a 1.68% difference in overall diameter.

With the speedometer calibrated for 235/60R17, an indicated 60 mph is actually 61.0 mph on 245/60R17, and revolutions per mile change from 718 to 706.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 235/60R17

Other comparisons with 245/60R17

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