20
Rear mech ‘B’ adjust
Shift chain to the small chain ring. While turning the
crank, push the rear derailleur inboard by hand to the
largest cog. Hold the rear derailleur in this position
while making the following adjustment. Using a 2,5 /
3 mm hex wrench to turn the b-adjust screw until the
chain gap equals approximately 6 mm (1/4“) from tip
of the cog to tip of upper guide pulley. While
pedalling, release the derailleur and check the chain
gap throughout the cassette.
Setting the chain gap at this point of your installation
may be considered a rough estimate. Precision index
shifting may require small changes of the b-
adjustment while setting the proper cable tension. Do
not use the b-adjust screw to adjust the rear
derailleur to act as a chain-tensioning device or to
prevent chain suck. This increases the chain gap
causing poor shifting performance.
Shift the chain to the smallest cog. While turning the pedals, move the shifter up 1 click, to the “8” position. If
the chain hesitates or does not shift to the second cog, increase the cable tension by turning the shifter barrel
adjuster counter clockwise. If the chain shifts beyond the second cog, decrease the cable tension by turning the
shifter barrel adjuster clockwise.
Repeat the two former steps until shifting and cable tension is accurate.
It is not enough that the chain should run quietly in each gear, it should also move smartly from one sprocket to
the next, without clattering or jamming.
Now check for smooth changing up through the range, checking one pair of sprockets at a time (9-8, 8-7, etc.)
Make any minor adjustments by turning the shifter barrel adjuster. Finally, check that the chain cannot jump off
the cassette, either on the inside into the spokes, or on the outside onto the dropout. This is adjusted using the
high and low limits screws as shown in section 2.16
Cut the cable off leaving about 1.5” (40mm) past the cable clamp, and crimp the cable end cover onto the cable
end.
2.14 Reflectors and bell
Reflectors and a bell are supplied with your bike. The bell can be mounted anywhere on the handlebars where it
can be reached easily and doesn't interfere with steering the bike. The reflectors have brackets which allow the
front reflector to be mounted on the front derailleur post, and the rear reflector to be mounted on the top rail of
the seat.
2.15 Check nuts and bolts
Generally, check all nuts, bolts and quick-releases to make sure everything is tight.
Summary of Contents for B1
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