Ultra motor A2B Metro, Service Manual

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5-1
b. Chain length is acceptable if the ten-
sion pulley sits 1.75 in. or less forward or
rearward of the guide pulley.
4. Visually inspect the chain.
a. The chain is too long if the upper run
sags as shown in Figure 2.
b. The chain is too long if it contacts itself
or any part of the derailleur once the
chain leaves the tension pulley (
Figure 3
).
5. Shift the derailleur and move the chain
to the innermost cog.
6. Check the chain as it passes through the
derailleur.
a. The chain should bend twice as passes
through the derailleur. The chain is too
short if it does not. See
Figure 4 .
CHAIN
Inspection
The chain inspection tool (Park Tool
CC-2C) is needed for this service.
1. Following the manufacturer’s instruc-
tions, install the chain inspection tool onto
the chain. Both of the tool’s pegs must sit
inside a chain link.
2. Rotate the tool’s dial so the pegs press
against the inside of the chain rollers.
3. The number opposite the V-notch on
the dial indicates the chain’s condition.
a. 0-1: the chain is in good condition.
b. 1-2: the chain is moderately worn.
c. 2-3: the chain is approaching the wear
limit.
d. 3 or more: the chain is worn beyond
the wear limit.
Checking Chain Length
1. Secure the A2B Metro in a stand at an
angle that matches the angle when the
bike sits upright on a level surface.
2. Shift the derailleur and move the chain
to the outermost cog (high gear).
3. Check the angle of a line drawn through
the center of the two derailleur pulleys rel-
ative to the ground or floor.
a. The chain length is perfect if this line is
perpendicular (90 degrees) to the ground
(
Figure 1 ).
b. Chain length is acceptable if the ten-
sion pulley sits 1.75 in. or less forward or
rearward of the guide pulley.
4. Visually inspect the chain.
a. The chain is too long if the upper run
sags as shown in
Figure 2 .
Chapter Five
CHAIN and CRANKSET
FIG. 2
FIG. 1
90˚