2009 Fox Racing Shox Owner's Manual - Bike-Components

Installing a 40 mm Fork
1. Verifying the Total Stack Height:
Note: The 40 direct mount crown requires a total stack height range from 105
mm to 166.8 mm.
See Figure 1: “40 Headset Stack Height” to understand what defines total stack height.
Measure to verify whether your total stack height falls within this height range specification.
• If your total stack height is less than 105.0 mm, add a headset spacer between
the upper headset parts and the upper crown, to arrive within this total headset stack
height specification.
• If your total stack height is greater than 166.8 mm, consider installing a shorter
stack headset.
Note: If you’re installing a steerer tube-mounted stem, the total height of
spacers used on a FOX steerer tube should never exceed 30 mm.
Figure 1: 40 Headset Stack Height
Warning! Have a qualified bicycle mechanic install the 40. Improperly
installed forks are dangerous, which can cause loss of steering
control that can lead to serious or fatal injuries.
The 40 with a direct mount upper crown is assembled with the lower crown set to 163.7 mm
below the top of the upper tubes (see Figure 2: “40 Crown Height” on page 163). The lower
Fox Racing Shox 2009 Owners Manual Installing a 40 mm Fork Page 162