TireSizesFinder

235/85R16 vs 275/65R17

275/65R17 is 0.65 in (16.6 mm) shorter than 235/85R16, a −2.06% diameter difference. With the speedometer set for 235/85R16, an indicated 60 mph is 58.8 mph on 275/65R17.

Is this a safe swap?

Diameter difference −2.06%: within the ±3% guideline

By overall diameter alone, 275/65R17 falls inside the ±3% range commonly used as a guideline when replacing 235/85R16. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 235/85R16 (31.73 in) vs 275/65R17 (31.07 in)235/85R1631.73 in × 9.25 in275/65R1731.07 in × 10.83 in
Side profile and tread width, drawn to the same scale.
235/85R16 vs 275/65R17 differences
Measurement235/85R16275/65R17Difference% diff
Overall diameter31.73 in (805.9 mm)31.07 in (789.3 mm)−0.65 in (−16.6 mm)−2.06%
Sidewall height7.86 in (199.8 mm)7.04 in (178.8 mm)−0.83 in (−21.0 mm)−10.51%
Section width9.25 in (235.0 mm)10.83 in (275.0 mm)+1.57 in (+40.0 mm)+17.02%
Circumference99.68 in (2,531.8 mm)97.62 in (2,479.7 mm)−2.05 in (−52.2 mm)−2.06%
Revolutions per mile636649+13+2.10%
True speed with the speedometer calibrated for 235/85R16
IndicatedActual on 235/85R16Actual on 275/65R17Difference
30 mph30.0 mph29.4 mph−0.6 mph
60 mph60.0 mph58.8 mph−1.2 mph
75 mph75.0 mph73.5 mph−1.5 mph

Ride-height change: 275/65R17 lowers the vehicle by 0.33 in (8.3 mm) at the axle (half the −16.6 mm diameter difference).

275/65R17 is 0.65 in shorter than 235/85R16 and 40 mm wider, a 2.06% difference in overall diameter.

With the speedometer calibrated for 235/85R16, an indicated 60 mph is actually 58.8 mph on 275/65R17, and revolutions per mile change from 636 to 649.

275/65R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 235/85R16.

Size pages

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