TireSizesFinder

245/50R19 vs 275/35R21

275/35R21 is 0.07 in (1.7 mm) shorter than 245/50R19, a −0.23% diameter difference. With the speedometer set for 245/50R19, an indicated 60 mph is 59.9 mph on 275/35R21.

Is this a safe swap?

Diameter difference −0.23%: under 1%

By overall diameter alone, 275/35R21 is a near match for 245/50R19; 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: 245/50R19 (28.65 in) vs 275/35R21 (28.58 in)245/50R1928.65 in × 9.65 in275/35R2128.58 in × 10.83 in
Side profile and tread width, drawn to the same scale.
245/50R19 vs 275/35R21 differences
Measurement245/50R19275/35R21Difference% diff
Overall diameter28.65 in (727.6 mm)28.58 in (725.9 mm)−0.07 in (−1.7 mm)−0.23%
Sidewall height4.82 in (122.5 mm)3.79 in (96.3 mm)−1.03 in (−26.2 mm)−21.43%
Section width9.65 in (245.0 mm)10.83 in (275.0 mm)+1.18 in (+30.0 mm)+12.24%
Circumference89.99 in (2,285.8 mm)89.78 in (2,280.5 mm)−0.21 in (−5.3 mm)−0.23%
Revolutions per mile704706+2+0.23%
True speed with the speedometer calibrated for 245/50R19
IndicatedActual on 245/50R19Actual on 275/35R21Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 275/35R21 lowers the vehicle by 0.03 in (0.8 mm) at the axle (half the −1.7 mm diameter difference).

275/35R21 is 0.07 in shorter than 245/50R19 and 30 mm wider, a 0.23% difference in overall diameter.

With the speedometer calibrated for 245/50R19, an indicated 60 mph is actually 59.9 mph on 275/35R21, and revolutions per mile change from 704 to 706.

275/35R21 mounts on a 21-inch wheel, a plus-2 fitment from the 19-inch wheel of 245/50R19.

Size pages

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