275/65R17 vs 265/70R17

265/70R17 is 0.53 in (13.5 mm) taller than 275/65R17, a +1.71% diameter difference. With the speedometer set for 275/65R17, an indicated 60 mph is 61.0 mph on 265/70R17.

Is this a safe swap?

Diameter difference +1.71%: within the ±3% guideline

By overall diameter alone, 265/70R17 falls inside the ±3% range commonly used as a guideline when replacing 275/65R17. 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.

275/65R17 vs 265/70R17 differences
Measurement	275/65R17	265/70R17	Difference	% diff
Overall diameter	31.07 in (789.3 mm)	31.61 in (802.8 mm)	+0.53 in (+13.5 mm)	+1.71%
Sidewall height	7.04 in (178.8 mm)	7.30 in (185.5 mm)	+0.27 in (+6.8 mm)	+3.78%
Section width	10.83 in (275.0 mm)	10.43 in (265.0 mm)	−0.39 in (−10.0 mm)	−3.64%
Circumference	97.62 in (2,479.7 mm)	99.29 in (2,522.1 mm)	+1.67 in (+42.4 mm)	+1.71%
Revolutions per mile	649	638	−11	−1.68%

True speed with the speedometer calibrated for 275/65R17
Indicated	Actual on 275/65R17	Actual on 265/70R17	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: 265/70R17 raises the vehicle by 0.27 in (6.8 mm) at the axle (half the +13.5 mm diameter difference).

265/70R17 is 0.53 in taller than 275/65R17 and 10 mm narrower, a 1.71% difference in overall diameter.

With the speedometer calibrated for 275/65R17, an indicated 60 mph is actually 61.0 mph on 265/70R17, and revolutions per mile change from 649 to 638.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 275/65R17

Other comparisons with 265/70R17

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