TireSizesFinder

265/70R15 vs 245/65R17

245/65R17 is 0.07 in (1.7 mm) shorter than 265/70R15, a −0.23% diameter difference. With the speedometer set for 265/70R15, an indicated 60 mph is 59.9 mph on 245/65R17.

Is this a safe swap?

Diameter difference −0.23%: under 1%

By overall diameter alone, 245/65R17 is a near match for 265/70R15; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 265/70R15 (29.61 in) vs 245/65R17 (29.54 in)265/70R1529.61 in × 10.43 in245/65R1729.54 in × 9.65 in
Side profile and tread width, drawn to the same scale.
265/70R15 vs 245/65R17 differences
Measurement265/70R15245/65R17Difference% diff
Overall diameter29.61 in (752.0 mm)29.54 in (750.3 mm)−0.07 in (−1.7 mm)−0.23%
Sidewall height7.30 in (185.5 mm)6.27 in (159.3 mm)−1.03 in (−26.2 mm)−14.15%
Section width10.43 in (265.0 mm)9.65 in (245.0 mm)−0.79 in (−20.0 mm)−7.55%
Circumference93.01 in (2,362.5 mm)92.80 in (2,357.1 mm)−0.21 in (−5.3 mm)−0.23%
Revolutions per mile681683+2+0.23%
True speed with the speedometer calibrated for 265/70R15
IndicatedActual on 265/70R15Actual on 245/65R17Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 245/65R17 lowers the vehicle by 0.03 in (0.9 mm) at the axle (half the −1.7 mm diameter difference).

245/65R17 is 0.07 in shorter than 265/70R15 and 20 mm narrower, a 0.23% difference in overall diameter.

With the speedometer calibrated for 265/70R15, an indicated 60 mph is actually 59.9 mph on 245/65R17, and revolutions per mile change from 681 to 683.

245/65R17 mounts on a 17-inch wheel, a plus-2 fitment from the 15-inch wheel of 265/70R15.

Size pages

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