255/85R16 vs 295/70R17

295/70R17 is 0.19 in (4.9 mm) taller than 255/85R16, a +0.58% diameter difference. With the speedometer set for 255/85R16, an indicated 60 mph is 60.4 mph on 295/70R17.

Is this a safe swap?

Diameter difference +0.58%: under 1%

By overall diameter alone, 295/70R17 is a near match for 255/85R16; 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.

255/85R16 vs 295/70R17 differences
Measurement	255/85R16	295/70R17	Difference	% diff
Overall diameter	33.07 in (839.9 mm)	33.26 in (844.8 mm)	+0.19 in (+4.9 mm)	+0.58%
Sidewall height	8.53 in (216.8 mm)	8.13 in (206.5 mm)	−0.40 in (−10.2 mm)	−4.73%
Section width	10.04 in (255.0 mm)	11.61 in (295.0 mm)	+1.57 in (+40.0 mm)	+15.69%
Circumference	103.88 in (2,638.6 mm)	104.49 in (2,654.0 mm)	+0.61 in (+15.4 mm)	+0.58%
Revolutions per mile	610	606	−4	−0.58%

True speed with the speedometer calibrated for 255/85R16
Indicated	Actual on 255/85R16	Actual on 295/70R17	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.4 mph	+0.4 mph
75 mph	75.0 mph	75.4 mph	+0.4 mph

Ride-height change: 295/70R17 raises the vehicle by 0.10 in (2.4 mm) at the axle (half the +4.9 mm diameter difference).

295/70R17 is 0.19 in taller than 255/85R16 and 40 mm wider, a 0.58% difference in overall diameter.

With the speedometer calibrated for 255/85R16, an indicated 60 mph is actually 60.4 mph on 295/70R17, and revolutions per mile change from 610 to 606.

295/70R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 255/85R16.

Size pages

Other comparisons with 255/85R16

Other comparisons with 295/70R17

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