TireSizesFinder

245/35R21 vs 265/35R21

265/35R21 is 0.55 in (14.0 mm) taller than 245/35R21, a +1.99% diameter difference. With the speedometer set for 245/35R21, an indicated 60 mph is 61.2 mph on 265/35R21.

Is this a safe swap?

Diameter difference +1.99%: within the ±3% guideline

By overall diameter alone, 265/35R21 falls inside the ±3% range commonly used as a guideline when replacing 245/35R21. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 245/35R21 (27.75 in) vs 265/35R21 (28.30 in)245/35R2127.75 in × 9.65 in265/35R2128.30 in × 10.43 in
Side profile and tread width, drawn to the same scale.
245/35R21 vs 265/35R21 differences
Measurement245/35R21265/35R21Difference% diff
Overall diameter27.75 in (704.9 mm)28.30 in (718.9 mm)+0.55 in (+14.0 mm)+1.99%
Sidewall height3.38 in (85.8 mm)3.65 in (92.8 mm)+0.28 in (+7.0 mm)+8.16%
Section width9.65 in (245.0 mm)10.43 in (265.0 mm)+0.79 in (+20.0 mm)+8.16%
Circumference87.19 in (2,214.5 mm)88.92 in (2,258.5 mm)+1.73 in (+44.0 mm)+1.99%
Revolutions per mile727713−14−1.95%
True speed with the speedometer calibrated for 245/35R21
IndicatedActual on 245/35R21Actual on 265/35R21Difference
30 mph30.0 mph30.6 mph+0.6 mph
60 mph60.0 mph61.2 mph+1.2 mph
75 mph75.0 mph76.5 mph+1.5 mph

Ride-height change: 265/35R21 raises the vehicle by 0.28 in (7.0 mm) at the axle (half the +14.0 mm diameter difference).

265/35R21 is 0.55 in taller than 245/35R21 and 20 mm wider, a 1.99% difference in overall diameter.

With the speedometer calibrated for 245/35R21, an indicated 60 mph is actually 61.2 mph on 265/35R21, and revolutions per mile change from 727 to 713.

Both sizes mount on 21-inch wheels.

Size pages

Other comparisons with 245/35R21

Other comparisons with 265/35R21

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