175/60R15 vs 175/65R15

175/65R15 is 0.69 in (17.5 mm) taller than 175/60R15, a +2.96% diameter difference. With the speedometer set for 175/60R15, an indicated 60 mph is 61.8 mph on 175/65R15.

Is this a safe swap?

Diameter difference +2.96%: within the ±3% guideline

By overall diameter alone, 175/65R15 falls inside the ±3% range commonly used as a guideline when replacing 175/60R15. 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.

175/60R15 vs 175/65R15 differences
Measurement	175/60R15	175/65R15	Difference	% diff
Overall diameter	23.27 in (591.0 mm)	23.96 in (608.5 mm)	+0.69 in (+17.5 mm)	+2.96%
Sidewall height	4.13 in (105.0 mm)	4.48 in (113.8 mm)	+0.34 in (+8.8 mm)	+8.33%
Section width	6.89 in (175.0 mm)	6.89 in (175.0 mm)	0.00 in (0.0 mm)	0.00%
Circumference	73.10 in (1,856.7 mm)	75.26 in (1,911.7 mm)	+2.16 in (+55.0 mm)	+2.96%
Revolutions per mile	867	842	−25	−2.88%

True speed with the speedometer calibrated for 175/60R15
Indicated	Actual on 175/60R15	Actual on 175/65R15	Difference
30 mph	30.0 mph	30.9 mph	+0.9 mph
60 mph	60.0 mph	61.8 mph	+1.8 mph
75 mph	75.0 mph	77.2 mph	+2.2 mph

Ride-height change: 175/65R15 raises the vehicle by 0.34 in (8.8 mm) at the axle (half the +17.5 mm diameter difference).

175/65R15 is 0.69 in taller than 175/60R15 and the same width, a 2.96% difference in overall diameter.

With the speedometer calibrated for 175/60R15, an indicated 60 mph is actually 61.8 mph on 175/65R15, and revolutions per mile change from 867 to 842.

Both sizes mount on 15-inch wheels.

Size pages

Other comparisons with 175/60R15

Other comparisons with 175/65R15

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