USING SIZE 235/35-19 FOR EXAMPLE

The dimensions of a 235/35-19 tire are

9.3” wide (section width) & 25.5” tall (outside dia)

The section width is 235mm wide

(There are 25.4mm to an inch)

STEP 1) 235mm divided by 25.4” = 9.25” (section width)

STEP 2) Multiply 9.25 (section width) by .35 (aspect ratio)

9.25 x .35 = 3.24” (section height)

To find the outside diameter

Multiply 3.24 (section height) x 2 then add rim diameter

STEP 3) 3.24” x 2 = 6.48” + 19.0” = 25.48” round out to 25.5  (outside dia)

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