265/75R15 vs 275/65R17

275/65R17 is 0.43 in (10.8 mm) taller than 265/75R15, a +1.39% diameter difference. With the speedometer set for 265/75R15, an indicated 60 mph is 60.8 mph on 275/65R17.

Is this a safe swap?

Diameter difference +1.39%: within the ±3% guideline

By overall diameter alone, 275/65R17 falls inside the ±3% range commonly used as a guideline when replacing 265/75R15. 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.

265/75R15 vs 275/65R17 differences
Measurement	265/75R15	275/65R17	Difference	% diff
Overall diameter	30.65 in (778.5 mm)	31.07 in (789.3 mm)	+0.43 in (+10.8 mm)	+1.39%
Sidewall height	7.82 in (198.8 mm)	7.04 in (178.8 mm)	−0.79 in (−20.0 mm)	−10.06%
Section width	10.43 in (265.0 mm)	10.83 in (275.0 mm)	+0.39 in (+10.0 mm)	+3.77%
Circumference	96.29 in (2,445.7 mm)	97.62 in (2,479.7 mm)	+1.34 in (+33.9 mm)	+1.39%
Revolutions per mile	658	649	−9	−1.37%

True speed with the speedometer calibrated for 265/75R15
Indicated	Actual on 265/75R15	Actual on 275/65R17	Difference
30 mph	30.0 mph	30.4 mph	+0.4 mph
60 mph	60.0 mph	60.8 mph	+0.8 mph
75 mph	75.0 mph	76.0 mph	+1.0 mph

Ride-height change: 275/65R17 raises the vehicle by 0.21 in (5.4 mm) at the axle (half the +10.8 mm diameter difference).

275/65R17 is 0.43 in taller than 265/75R15 and 10 mm wider, a 1.39% difference in overall diameter.

With the speedometer calibrated for 265/75R15, an indicated 60 mph is actually 60.8 mph on 275/65R17, and revolutions per mile change from 658 to 649.

275/65R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 265/75R15.

Size pages

Other comparisons with 265/75R15

Other comparisons with 275/65R17

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