TireSizesFinder

265/60R18 vs 295/45R20

295/45R20 is 0.07 in (1.7 mm) shorter than 265/60R18, a −0.22% diameter difference. With the speedometer set for 265/60R18, an indicated 60 mph is 59.9 mph on 295/45R20.

Is this a safe swap?

Diameter difference −0.22%: under 1%

By overall diameter alone, 295/45R20 is a near match for 265/60R18; 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: 265/60R18 (30.52 in) vs 295/45R20 (30.45 in)265/60R1830.52 in × 10.43 in295/45R2030.45 in × 11.61 in
Side profile and tread width, drawn to the same scale.
265/60R18 vs 295/45R20 differences
Measurement265/60R18295/45R20Difference% diff
Overall diameter30.52 in (775.2 mm)30.45 in (773.5 mm)−0.07 in (−1.7 mm)−0.22%
Sidewall height6.26 in (159.0 mm)5.23 in (132.8 mm)−1.03 in (−26.2 mm)−16.51%
Section width10.43 in (265.0 mm)11.61 in (295.0 mm)+1.18 in (+30.0 mm)+11.32%
Circumference95.88 in (2,435.4 mm)95.67 in (2,430.0 mm)−0.21 in (−5.3 mm)−0.22%
Revolutions per mile661662+1+0.22%
True speed with the speedometer calibrated for 265/60R18
IndicatedActual on 265/60R18Actual on 295/45R20Difference
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: 295/45R20 lowers the vehicle by 0.03 in (0.9 mm) at the axle (half the −1.7 mm diameter difference).

295/45R20 is 0.07 in shorter than 265/60R18 and 30 mm wider, a 0.22% difference in overall diameter.

With the speedometer calibrated for 265/60R18, an indicated 60 mph is actually 59.9 mph on 295/45R20, and revolutions per mile change from 661 to 662.

295/45R20 mounts on a 20-inch wheel, a plus-2 fitment from the 18-inch wheel of 265/60R18.

Size pages

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