215/85R16 vs 245/70R17

245/70R17 is 0.11 in (2.9 mm) taller than 215/85R16, a +0.38% diameter difference. With the speedometer set for 215/85R16, an indicated 60 mph is 60.2 mph on 245/70R17.

Is this a safe swap?

Diameter difference +0.38%: under 1%

By overall diameter alone, 245/70R17 is a near match for 215/85R16; 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.

215/85R16 vs 245/70R17 differences
Measurement	215/85R16	245/70R17	Difference	% diff
Overall diameter	30.39 in (771.9 mm)	30.50 in (774.8 mm)	+0.11 in (+2.9 mm)	+0.38%
Sidewall height	7.19 in (182.8 mm)	6.75 in (171.5 mm)	−0.44 in (−11.2 mm)	−6.16%
Section width	8.46 in (215.0 mm)	9.65 in (245.0 mm)	+1.18 in (+30.0 mm)	+13.95%
Circumference	95.47 in (2,425.0 mm)	95.83 in (2,434.1 mm)	+0.36 in (+9.1 mm)	+0.38%
Revolutions per mile	664	661	−2	−0.37%

True speed with the speedometer calibrated for 215/85R16
Indicated	Actual on 215/85R16	Actual on 245/70R17	Difference
30 mph	30.0 mph	30.1 mph	+0.1 mph
60 mph	60.0 mph	60.2 mph	+0.2 mph
75 mph	75.0 mph	75.3 mph	+0.3 mph

Ride-height change: 245/70R17 raises the vehicle by 0.06 in (1.4 mm) at the axle (half the +2.9 mm diameter difference).

245/70R17 is 0.11 in taller than 215/85R16 and 30 mm wider, a 0.38% difference in overall diameter.

With the speedometer calibrated for 215/85R16, an indicated 60 mph is actually 60.2 mph on 245/70R17, and revolutions per mile change from 664 to 661.

245/70R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 215/85R16.

Size pages

Other comparisons with 215/85R16

Other comparisons with 245/70R17

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