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USPD Ring Sprocket Change
NOTE: The
following instructions assume you have already removed the USPD
drive
assembly from the wheel. In the case of USPD kits, (drives in kit
form
installed on a conventional bike) the drive must be removed to allow
removal
of the studs attaching the ring sprocket to the bearing assembly.
Currie
bikes with pre-installed drives do not use a spoke interface as do
kit
drives. In the case of pre-installed drives, it is not necessary to remove
the
drive from the threaded hub.
The pictures above show a "spoke
adapter" USPD drive plate removed from the hub.
The following pictures and instructions apply to both spoke drives and
pre-installed
USPD drives that thread directly onto the wheel hub.
Using a "pin spanner", or similar
tool, remove the retaining collar by turning it counter-
clockwise. You may or may not find a thick spacer ring under the collar. In
older USPD
drives with an aluminum backing plate (the black plate everything mounts to)
there is
no spacer ring. In newer systems using a stamped steel plate (such as the one
shown
in the pictures above) the spacer ring is required. Remove the spacer, if used,
and
lift the drive plate off the adapter assembly.
Look carefully at the 9 o'clock
position in the pictures above. Notice that the aluminum
indexing ring (picture on the right, above) has a small protruding post that
engages a slot
in the adapter assembly. When re-assembling, it is critical that you install
this indexing ring
so its post engages exactly as shown in the first picture on the left.
Notice the slot in the indexing ring
at the 3 o'clock position. Also, see a small dimple in the
steel mounting plate above. (on aluminum plates the dimple is replaced with a
small post)
The dimple (or post) MUST engage the slot in
the indexing ring during assembly. This
is critical, and requires you to re-assemble with great care. Failure to seat
the dimple (or
post) in the slot of the indexing ring can result in drive failure.
Carefully remove the 8 or 9 Phillips
head machine screws. Hint: Use a perfectly fitting
Phillips head screw driver! This is important, since the screw heads can be
easily
damaged making their removal nearly impossible. Also, the machine screws are
often
coated with Locktight. Press the screw driver hard against the head to fully
engage
before breaking them free.
Install the new ring sprocket in the
reverse order. Your chain will likely need lengthening
or shortening to fit the new sprocket diameter. Use the following link if you
need help
with chain modifications: KitChain.htm