215/60R15 vs 265/40R17

265/40R17 is 0.19 in (4.8 mm) taller than 215/60R15, a +0.75% diameter difference. With the speedometer set for 215/60R15, an indicated 60 mph is 60.5 mph on 265/40R17.

Is this a safe swap?

Diameter difference +0.75%: under 1%

By overall diameter alone, 265/40R17 is a near match for 215/60R15; 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.

215/60R15 vs 265/40R17 differences
Measurement	215/60R15	265/40R17	Difference	% diff
Overall diameter	25.16 in (639.0 mm)	25.35 in (643.8 mm)	+0.19 in (+4.8 mm)	+0.75%
Sidewall height	5.08 in (129.0 mm)	4.17 in (106.0 mm)	−0.91 in (−23.0 mm)	−17.83%
Section width	8.46 in (215.0 mm)	10.43 in (265.0 mm)	+1.97 in (+50.0 mm)	+23.26%
Circumference	79.03 in (2,007.5 mm)	79.63 in (2,022.6 mm)	+0.59 in (+15.1 mm)	+0.75%
Revolutions per mile	802	796	−6	−0.75%

True speed with the speedometer calibrated for 215/60R15
Indicated	Actual on 215/60R15	Actual on 265/40R17	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.6 mph	+0.6 mph

Ride-height change: 265/40R17 raises the vehicle by 0.09 in (2.4 mm) at the axle (half the +4.8 mm diameter difference).

265/40R17 is 0.19 in taller than 215/60R15 and 50 mm wider, a 0.75% difference in overall diameter.

With the speedometer calibrated for 215/60R15, an indicated 60 mph is actually 60.5 mph on 265/40R17, and revolutions per mile change from 802 to 796.

265/40R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 215/60R15.

Size pages

Other comparisons with 215/60R15

Other comparisons with 265/40R17

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