215/75R14 vs 27x8.50R14

27x8.50R14 is 0.30 in (7.7 mm) taller than 215/75R14, a +1.14% diameter difference. With the speedometer set for 215/75R14, an indicated 60 mph is 60.7 mph on 27x8.50R14.

Is this a safe swap?

Diameter difference +1.14%: within the ±3% guideline

By overall diameter alone, 27x8.50R14 falls inside the ±3% range commonly used as a guideline when replacing 215/75R14. 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.

215/75R14 vs 27x8.50R14 differences
Measurement	215/75R14	27x8.50R14	Difference	% diff
Overall diameter	26.70 in (678.1 mm)	27.00 in (685.8 mm)	+0.30 in (+7.7 mm)	+1.14%
Sidewall height	6.35 in (161.3 mm)	6.50 in (165.1 mm)	+0.15 in (+3.8 mm)	+2.39%
Section width	8.46 in (215.0 mm)	8.50 in (215.9 mm)	+0.04 in (+0.9 mm)	+0.42%
Circumference	83.87 in (2,130.3 mm)	84.82 in (2,154.5 mm)	+0.95 in (+24.2 mm)	+1.14%
Revolutions per mile	755	747	−8	−1.12%

True speed with the speedometer calibrated for 215/75R14
Indicated	Actual on 215/75R14	Actual on 27x8.50R14	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	75.9 mph	+0.9 mph

Ride-height change: 27x8.50R14 raises the vehicle by 0.15 in (3.9 mm) at the axle (half the +7.7 mm diameter difference).

27x8.50R14 is 0.30 in taller than 215/75R14 and 1 mm wider, a 1.14% difference in overall diameter.

With the speedometer calibrated for 215/75R14, an indicated 60 mph is actually 60.7 mph on 27x8.50R14, and revolutions per mile change from 755 to 747.

Both sizes mount on 14-inch wheels.

Size pages

Other comparisons with 215/75R14

Other comparisons with 27x8.50R14

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