245/70R17 vs 235/60R19

235/60R19 is 0.40 in (10.2 mm) shorter than 245/70R17, a −1.32% diameter difference. With the speedometer set for 245/70R17, an indicated 60 mph is 59.2 mph on 235/60R19.

Is this a safe swap?

Diameter difference −1.32%: within the ±3% guideline

By overall diameter alone, 235/60R19 falls inside the ±3% range commonly used as a guideline when replacing 245/70R17. 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.

245/70R17 vs 235/60R19 differences
Measurement	245/70R17	235/60R19	Difference	% diff
Overall diameter	30.50 in (774.8 mm)	30.10 in (764.6 mm)	−0.40 in (−10.2 mm)	−1.32%
Sidewall height	6.75 in (171.5 mm)	5.55 in (141.0 mm)	−1.20 in (−30.5 mm)	−17.78%
Section width	9.65 in (245.0 mm)	9.25 in (235.0 mm)	−0.39 in (−10.0 mm)	−4.08%
Circumference	95.83 in (2,434.1 mm)	94.57 in (2,402.1 mm)	−1.26 in (−32.0 mm)	−1.32%
Revolutions per mile	661	670	+9	+1.33%

True speed with the speedometer calibrated for 245/70R17
Indicated	Actual on 245/70R17	Actual on 235/60R19	Difference
30 mph	30.0 mph	29.6 mph	−0.4 mph
60 mph	60.0 mph	59.2 mph	−0.8 mph
75 mph	75.0 mph	74.0 mph	−1.0 mph

Ride-height change: 235/60R19 lowers the vehicle by 0.20 in (5.1 mm) at the axle (half the −10.2 mm diameter difference).

235/60R19 is 0.40 in shorter than 245/70R17 and 10 mm narrower, a 1.32% difference in overall diameter.

With the speedometer calibrated for 245/70R17, an indicated 60 mph is actually 59.2 mph on 235/60R19, and revolutions per mile change from 661 to 670.

235/60R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 245/70R17.

Size pages

Other comparisons with 245/70R17

Other comparisons with 235/60R19

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