TireSizesFinder

265/65R17 vs 265/70R17

265/70R17 is 1.04 in (26.5 mm) taller than 265/65R17, a +3.41% diameter difference. With the speedometer set for 265/65R17, an indicated 60 mph is 62.0 mph on 265/70R17.

Is this a safe swap?

Diameter difference +3.41%: outside the ±3% guideline

By overall diameter alone, 265/70R17 falls outside the ±3% range commonly used as a guideline when replacing 265/65R17; speedometer and ride-height changes are larger. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 265/65R17 (30.56 in) vs 265/70R17 (31.61 in)265/65R1730.56 in × 10.43 in265/70R1731.61 in × 10.43 in
Side profile and tread width, drawn to the same scale.
265/65R17 vs 265/70R17 differences
Measurement265/65R17265/70R17Difference% diff
Overall diameter30.56 in (776.3 mm)31.61 in (802.8 mm)+1.04 in (+26.5 mm)+3.41%
Sidewall height6.78 in (172.3 mm)7.30 in (185.5 mm)+0.52 in (+13.3 mm)+7.69%
Section width10.43 in (265.0 mm)10.43 in (265.0 mm)0.00 in (0.0 mm)0.00%
Circumference96.02 in (2,438.8 mm)99.29 in (2,522.1 mm)+3.28 in (+83.3 mm)+3.41%
Revolutions per mile660638−22−3.30%
True speed with the speedometer calibrated for 265/65R17
IndicatedActual on 265/65R17Actual on 265/70R17Difference
30 mph30.0 mph31.0 mph+1.0 mph
60 mph60.0 mph62.0 mph+2.0 mph
75 mph75.0 mph77.6 mph+2.6 mph

Ride-height change: 265/70R17 raises the vehicle by 0.52 in (13.3 mm) at the axle (half the +26.5 mm diameter difference).

265/70R17 is 1.04 in taller than 265/65R17 and the same width, a 3.41% difference in overall diameter.

With the speedometer calibrated for 265/65R17, an indicated 60 mph is actually 62.0 mph on 265/70R17, and revolutions per mile change from 660 to 638.

Both sizes mount on 17-inch wheels.

Size pages

Other comparisons with 265/65R17

Other comparisons with 265/70R17

Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.