225/75R16 vs 245/70R16

245/70R16 is 0.22 in (5.5 mm) taller than 225/75R16, a +0.74% diameter difference. With the speedometer set for 225/75R16, an indicated 60 mph is 60.4 mph on 245/70R16.

Is this a safe swap?

Diameter difference +0.74%: under 1%

By overall diameter alone, 245/70R16 is a near match for 225/75R16; 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.

225/75R16 vs 245/70R16 differences
Measurement	225/75R16	245/70R16	Difference	% diff
Overall diameter	29.29 in (743.9 mm)	29.50 in (749.4 mm)	+0.22 in (+5.5 mm)	+0.74%
Sidewall height	6.64 in (168.8 mm)	6.75 in (171.5 mm)	+0.11 in (+2.8 mm)	+1.63%
Section width	8.86 in (225.0 mm)	9.65 in (245.0 mm)	+0.79 in (+20.0 mm)	+8.89%
Circumference	92.01 in (2,337.0 mm)	92.69 in (2,354.3 mm)	+0.68 in (+17.3 mm)	+0.74%
Revolutions per mile	689	684	−5	−0.73%

True speed with the speedometer calibrated for 225/75R16
Indicated	Actual on 225/75R16	Actual on 245/70R16	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	75.6 mph	+0.6 mph

Ride-height change: 245/70R16 raises the vehicle by 0.11 in (2.8 mm) at the axle (half the +5.5 mm diameter difference).

245/70R16 is 0.22 in taller than 225/75R16 and 20 mm wider, a 0.74% difference in overall diameter.

With the speedometer calibrated for 225/75R16, an indicated 60 mph is actually 60.4 mph on 245/70R16, and revolutions per mile change from 689 to 684.

Both sizes mount on 16-inch wheels.

Size pages

Other comparisons with 225/75R16

Other comparisons with 245/70R16

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