TireSizesFinder

27x8.50R14 vs 215/75R15

215/75R15 is 0.70 in (17.7 mm) taller than 27x8.50R14, a +2.58% diameter difference. With the speedometer set for 27x8.50R14, an indicated 60 mph is 61.5 mph on 215/75R15.

Is this a safe swap?

Diameter difference +2.58%: within the ±3% guideline

By overall diameter alone, 215/75R15 falls inside the ±3% range commonly used as a guideline when replacing 27x8.50R14. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 27x8.50R14 (27.00 in) vs 215/75R15 (27.70 in)27x8.50R1427.00 in × 8.50 in215/75R1527.70 in × 8.46 in
Side profile and tread width, drawn to the same scale.
27x8.50R14 vs 215/75R15 differences
Measurement27x8.50R14215/75R15Difference% diff
Overall diameter27.00 in (685.8 mm)27.70 in (703.5 mm)+0.70 in (+17.7 mm)+2.58%
Sidewall height6.50 in (165.1 mm)6.35 in (161.3 mm)−0.15 in (−3.8 mm)−2.33%
Section width8.50 in (215.9 mm)8.46 in (215.0 mm)−0.04 in (−0.9 mm)−0.42%
Circumference84.82 in (2,154.5 mm)87.01 in (2,210.1 mm)+2.19 in (+55.6 mm)+2.58%
Revolutions per mile747728−19−2.52%
True speed with the speedometer calibrated for 27x8.50R14
IndicatedActual on 27x8.50R14Actual on 215/75R15Difference
30 mph30.0 mph30.8 mph+0.8 mph
60 mph60.0 mph61.5 mph+1.5 mph
75 mph75.0 mph76.9 mph+1.9 mph

Ride-height change: 215/75R15 raises the vehicle by 0.35 in (8.9 mm) at the axle (half the +17.7 mm diameter difference).

215/75R15 is 0.70 in taller than 27x8.50R14 and 1 mm narrower, a 2.58% difference in overall diameter.

With the speedometer calibrated for 27x8.50R14, an indicated 60 mph is actually 61.5 mph on 215/75R15, and revolutions per mile change from 747 to 728.

215/75R15 mounts on a 15-inch wheel, a plus-1 fitment from the 14-inch wheel of 27x8.50R14.

Size pages

Other comparisons with 27x8.50R14

Other comparisons with 215/75R15

Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.