See this link to
Convert Toe Inches to Degrees
The Honda AP1 S2000 Shop Manual calls for 0.25
inch of total toe-in at the rear wheels. Toe-in in inches is the
difference between measurements A and B in the diagram below. Shop
Manual toe-in in inches is measured on the tire tread at the axle
level.
0.25 Inch (0.58º) of Total Toe-In
Measurement A - B = 0.25" or 1/4" total toe-in. Note 0.0625" = 1/16"
and 4/16 = 1/4
The Shop Manual 0.25 inch of total toe-in is made up of:
0.0625" measured at leading tread of the left tire +
0.0625" measured at trailing tread of the left tire +
0.0625" measured at leading
tread of the right tire + 0.0625" measured at trailing tread of the
right tire. 0.0625" x 4 = 0.25".
When measuring toe in degrees you do not need to double the measurement
for the leading and trailing edge of the tires as you do when using
inches. If one rear wheel measures 0.29º of toe-in
and the other measures 0.29º, then total rear toe-in is 0.58º, not
1.16º.
AP1: 0.25 inch (1/4" or 6mm) of total rear toe-in
is equal to 0.58º (decimal
degrees) of total toe-in.
AP2: 0.14 inch (3.7mm) of total rear toe-in is
equal to 0.33º (decimal
degrees) of total toe-in.
If you use string to measure toe and use the wheel rim for measurements
your numbers will not match up with the Shop Manual because
Shop Manual
toe is measured at the tire tread. You can get pretty close by
decreasing the tire tread measurement by 25% to approximate the correct
rim measurement.
If someone says they run 1/4 inch of toe-in you need to ask:
Is that total toe-in? (total for both wheels on the
axle, or just a single wheel?)
Where was the 1/4" measured, at the rim or tire
tread? (tire tread is the norm)
Was the 1/4" measured on one side of the tire, or
both sides (leading & trailing tread on both tires = normal total toe)
For more info on aligning the S2000 see the Alignment and Corner Balance pages.
By Rob Robinette
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[Convert Toe Inches To Degrees]
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