245/75R17 vs 265/70R17

265/70R17 is 0.14 in (3.5 mm) taller than 245/75R17, a +0.44% diameter difference. With the speedometer set for 245/75R17, an indicated 60 mph is 60.3 mph on 265/70R17.

Is this a safe swap?

Diameter difference +0.44%: under 1%

By overall diameter alone, 265/70R17 is a near match for 245/75R17; 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.

245/75R17 vs 265/70R17 differences
Measurement	245/75R17	265/70R17	Difference	% diff
Overall diameter	31.47 in (799.3 mm)	31.61 in (802.8 mm)	+0.14 in (+3.5 mm)	+0.44%
Sidewall height	7.23 in (183.8 mm)	7.30 in (185.5 mm)	+0.07 in (+1.8 mm)	+0.95%
Section width	9.65 in (245.0 mm)	10.43 in (265.0 mm)	+0.79 in (+20.0 mm)	+8.16%
Circumference	98.86 in (2,511.1 mm)	99.29 in (2,522.1 mm)	+0.43 in (+11.0 mm)	+0.44%
Revolutions per mile	641	638	−3	−0.44%

True speed with the speedometer calibrated for 245/75R17
Indicated	Actual on 245/75R17	Actual on 265/70R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.3 mph	+0.3 mph
75 mph	75.0 mph	75.3 mph	+0.3 mph

Ride-height change: 265/70R17 raises the vehicle by 0.07 in (1.8 mm) at the axle (half the +3.5 mm diameter difference).

265/70R17 is 0.14 in taller than 245/75R17 and 20 mm wider, a 0.44% difference in overall diameter.

With the speedometer calibrated for 245/75R17, an indicated 60 mph is actually 60.3 mph on 265/70R17, and revolutions per mile change from 641 to 638.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 245/75R17

Other comparisons with 265/70R17

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