205/75R14 vs 225/70R14

225/70R14 is 0.30 in (7.5 mm) taller than 205/75R14, a +1.13% diameter difference. With the speedometer set for 205/75R14, an indicated 60 mph is 60.7 mph on 225/70R14.

Is this a safe swap?

Diameter difference +1.13%: within the ±3% guideline

By overall diameter alone, 225/70R14 falls inside the ±3% range commonly used as a guideline when replacing 205/75R14. 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.

205/75R14 vs 225/70R14 differences
Measurement	205/75R14	225/70R14	Difference	% diff
Overall diameter	26.11 in (663.1 mm)	26.40 in (670.6 mm)	+0.30 in (+7.5 mm)	+1.13%
Sidewall height	6.05 in (153.8 mm)	6.20 in (157.5 mm)	+0.15 in (+3.8 mm)	+2.44%
Section width	8.07 in (205.0 mm)	8.86 in (225.0 mm)	+0.79 in (+20.0 mm)	+9.76%
Circumference	82.02 in (2,083.2 mm)	82.94 in (2,106.8 mm)	+0.93 in (+23.6 mm)	+1.13%
Revolutions per mile	773	764	−9	−1.12%

True speed with the speedometer calibrated for 205/75R14
Indicated	Actual on 205/75R14	Actual on 225/70R14	Difference
30 mph	30.0 mph	30.3 mph	+0.3 mph
60 mph	60.0 mph	60.7 mph	+0.7 mph
75 mph	75.0 mph	75.8 mph	+0.8 mph

Ride-height change: 225/70R14 raises the vehicle by 0.15 in (3.8 mm) at the axle (half the +7.5 mm diameter difference).

225/70R14 is 0.30 in taller than 205/75R14 and 20 mm wider, a 1.13% difference in overall diameter.

With the speedometer calibrated for 205/75R14, an indicated 60 mph is actually 60.7 mph on 225/70R14, and revolutions per mile change from 773 to 764.

Both sizes mount on 14-inch wheels.

Size pages

Other comparisons with 205/75R14

Other comparisons with 225/70R14

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