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2. RIM DRILLING INSTRUCTIONS FOR WHEEL DRIVE SPEED
SENSOR MAGNETS
On wheels which do not have pre-punched mounting holes, proceed as follows:
RIMS WITH FOUR OR EIGHT HOLE STUD PATTERN:
Choose stud holes that are opposite each other as shown below. Using the center of opposite holes,
scribe two lines on the rim web to divide the circumference into four equal parts. Measure in one
inch from the outer edge of the web on each of the lines drawn. Mark this point as the center. Drill
four 1/2" holes for mounting the magnets.
NOTE: The distance (D) between each set of drilled holes must be equal within 1/8"
[3 mm] to ensure accuracy of system.
RIMS WITH SIX HOLE STUD PATTERN:
Locate the center of the holes to be drilled by using the rim webbing as a guide. Obtain a small piece
of wood and cut to fit exactly over the web as shown. Measure the length of the piece of wood and
mark the center on one edge. Using the center mark on the piece of wood, mark each of the four
webs. Measure in one inch from the outer edge of the web on each of the lines drawn. Mark this
point as center and drill four 1/2" holes for mounting the magnets.
NOTE: The distance (D) between each set of drilled holes must be equal within 1/8"
[3 mm] to ensure accuracy of system.
EIGHT HOLE STUD PATTERN SIX HOLE STUD PATTERN
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