TireSizesFinder

27x8.50R14 vs 215/70R15

215/70R15 is 0.15 in (3.8 mm) shorter than 27x8.50R14, a −0.55% diameter difference. With the speedometer set for 27x8.50R14, an indicated 60 mph is 59.7 mph on 215/70R15.

Is this a safe swap?

Diameter difference −0.55%: under 1%

By overall diameter alone, 215/70R15 is a near match for 27x8.50R14; the speedometer changes by less than 1%. 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 215/70R15 (26.85 in)27x8.50R1427.00 in × 8.50 in215/70R1526.85 in × 8.46 in
Side profile and tread width, drawn to the same scale.
27x8.50R14 vs 215/70R15 differences
Measurement27x8.50R14215/70R15Difference% diff
Overall diameter27.00 in (685.8 mm)26.85 in (682.0 mm)−0.15 in (−3.8 mm)−0.55%
Sidewall height6.50 in (165.1 mm)5.93 in (150.5 mm)−0.57 in (−14.6 mm)−8.84%
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)84.35 in (2,142.6 mm)−0.47 in (−11.9 mm)−0.55%
Revolutions per mile747751+4+0.56%
True speed with the speedometer calibrated for 27x8.50R14
IndicatedActual on 27x8.50R14Actual on 215/70R15Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.7 mph−0.3 mph
75 mph75.0 mph74.6 mph−0.4 mph

Ride-height change: 215/70R15 lowers the vehicle by 0.07 in (1.9 mm) at the axle (half the −3.8 mm diameter difference).

215/70R15 is 0.15 in shorter than 27x8.50R14 and 1 mm narrower, a 0.55% difference in overall diameter.

With the speedometer calibrated for 27x8.50R14, an indicated 60 mph is actually 59.7 mph on 215/70R15, and revolutions per mile change from 747 to 751.

215/70R15 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 215/70R15

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