205/75R16 vs 245/65R16

245/65R16 is 0.43 in (11.0 mm) taller than 205/75R16, a +1.54% diameter difference. With the speedometer set for 205/75R16, an indicated 60 mph is 60.9 mph on 245/65R16.

Is this a safe swap?

Diameter difference +1.54%: within the ±3% guideline

By overall diameter alone, 245/65R16 falls inside the ±3% range commonly used as a guideline when replacing 205/75R16. 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.

205/75R16 vs 245/65R16 differences
Measurement	205/75R16	245/65R16	Difference	% diff
Overall diameter	28.11 in (713.9 mm)	28.54 in (724.9 mm)	+0.43 in (+11.0 mm)	+1.54%
Sidewall height	6.05 in (153.8 mm)	6.27 in (159.3 mm)	+0.22 in (+5.5 mm)	+3.58%
Section width	8.07 in (205.0 mm)	9.65 in (245.0 mm)	+1.57 in (+40.0 mm)	+19.51%
Circumference	88.30 in (2,242.8 mm)	89.66 in (2,277.3 mm)	+1.36 in (+34.6 mm)	+1.54%
Revolutions per mile	718	707	−11	−1.52%

True speed with the speedometer calibrated for 205/75R16
Indicated	Actual on 205/75R16	Actual on 245/65R16	Difference
30 mph	30.0 mph	30.5 mph	+0.5 mph
60 mph	60.0 mph	60.9 mph	+0.9 mph
75 mph	75.0 mph	76.2 mph	+1.2 mph

Ride-height change: 245/65R16 raises the vehicle by 0.22 in (5.5 mm) at the axle (half the +11.0 mm diameter difference).

245/65R16 is 0.43 in taller than 205/75R16 and 40 mm wider, a 1.54% difference in overall diameter.

With the speedometer calibrated for 205/75R16, an indicated 60 mph is actually 60.9 mph on 245/65R16, and revolutions per mile change from 718 to 707.

Both sizes mount on 16-inch wheels.

Size pages

Other comparisons with 205/75R16

Other comparisons with 245/65R16

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