TireSizesFinder

245/45R19 vs 245/35R21

245/35R21 is 0.07 in (1.8 mm) taller than 245/45R19, a +0.26% diameter difference. With the speedometer set for 245/45R19, an indicated 60 mph is 60.2 mph on 245/35R21.

Is this a safe swap?

Diameter difference +0.26%: under 1%

By overall diameter alone, 245/35R21 is a near match for 245/45R19; 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: 245/45R19 (27.68 in) vs 245/35R21 (27.75 in)245/45R1927.68 in × 9.65 in245/35R2127.75 in × 9.65 in
Side profile and tread width, drawn to the same scale.
245/45R19 vs 245/35R21 differences
Measurement245/45R19245/35R21Difference% diff
Overall diameter27.68 in (703.1 mm)27.75 in (704.9 mm)+0.07 in (+1.8 mm)+0.26%
Sidewall height4.34 in (110.3 mm)3.38 in (85.8 mm)−0.96 in (−24.5 mm)−22.22%
Section width9.65 in (245.0 mm)9.65 in (245.0 mm)0.00 in (0.0 mm)0.00%
Circumference86.96 in (2,208.9 mm)87.19 in (2,214.5 mm)+0.22 in (+5.7 mm)+0.26%
Revolutions per mile729727−2−0.26%
True speed with the speedometer calibrated for 245/45R19
IndicatedActual on 245/45R19Actual on 245/35R21Difference
30 mph30.0 mph30.1 mph+0.1 mph
60 mph60.0 mph60.2 mph+0.2 mph
75 mph75.0 mph75.2 mph+0.2 mph

Ride-height change: 245/35R21 raises the vehicle by 0.04 in (0.9 mm) at the axle (half the +1.8 mm diameter difference).

245/35R21 is 0.07 in taller than 245/45R19 and the same width, a 0.26% difference in overall diameter.

With the speedometer calibrated for 245/45R19, an indicated 60 mph is actually 60.2 mph on 245/35R21, and revolutions per mile change from 729 to 727.

245/35R21 mounts on a 21-inch wheel, a plus-2 fitment from the 19-inch wheel of 245/45R19.

Size pages

Other comparisons with 245/45R19

Other comparisons with 245/35R21

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