User Guide

26
DRIVETRAIN—PEDALS, CRANK, CHAIN, AND CASSETTE
Introduction
The drivetrain consists of the parts of the bicycle
that transmit power to the rear wheel. This system
includes the pedals (and toeclip assemblies on some
models), the crankset consisting of the left and
right crank arms, the chainrings and bottom bracket
assembly, the chain, and the cassette (Fig. 37). When
the components of this system are working together
properly shifting will be easy, your bike will be quiet,
and its efficiency can reach its maximum. For bikes
equipped with Shimano Nexus 7 speed drivetrains,
also refer to page 34, Shimano Nexus 7 Speed Internal
Shift System.
Inspection
Once a month, inspect the chain and cassette. The chain should be clean, free of
rust, and properly oiled. All links of the chain should pivot smoothly
and without squeaking, and no links of the chain should be deformed.
Just like the chain, keep the cassette as clean as possible. Cleaning
and lubrication procedures are covered in the Lubrication section. To
inspect the cassette or freewheel, take the chain off and rotate the
cassette in your hands. If you hear a grinding noise or your cassette
stops immediately after spinning it, the cassette may need adjustment
or replacement. Take your bicycle to your Fisher dealer for service.
On single speed bikes, check the chain tension once a month. When
grasped in the middle of the chain run between the front and rear
sprockets, there should be a total of 1/4 to 1/2 inches (6-12 mm) total
vertical movement (Fig. 38).
On bikes with a chainguard, check that the chainguard is firmly
attached and correctly aligned once a month. Check the chainguard for
looseness. Push side to side, and tap on it. Any movement or rattling
may indicate that the chainguard is loose. Lift the rear wheel off the ground and rotate
the crankarms. Listen for any sounds which might indicate the crank or chain is rubbing
on the chainguard. Realign the chainguard so that it does not rub, and tighten the attach-
ment bolts firmly so that the chainguard cannot move.
Every 3 months, inspect your pedals and toeclips. Tighten the pedals into the crank
arms to 350-380 lb•in (40.2-42.9 Nm). Tighten the right pedal by turning the pedal
shaft clockwise, but tighten the left pedal in a counter-clockwise direction. Check that
the pedal bearings are properly adjusted. Rotate and move the pedals right to left
and up and down with your hand. If you feel any looseness or roughness in the pedal
bearings, your pedal needs to be adjusted, re-greased, or replaced by your Fisher
dealer. Make sure your toeclips are securely tightened to the pedal, and that the pedal
reflectors are clean and securely in place.
Every 3 months inspect the crankset, including the left and right crank arms, the bottom
bracket set (spindle and bearing assembly), and the chainrings. For bikes with crank bolts,
tighten the crank bolt on each crank arm to 350-435 lb•in (39.5-49.2 Nm). For bikes with
chainring bolts, tighten the chainring bolts to 50-70 lb•in (5.7-7.9 Nm). Check the bottom
bracket bearing adjustment by first removing the chain from the chainrings, then rotate
the crank so that one of the arms is parallel the seat tube. Put one hand on the crank arm
and one hand on the seat tube and attempt to move the crank arm laterally toward and
away from the seat tube. If the crank feels or sounds loose, the bottom bracket bearings
need to be adjusted by your Fisher dealer.
Next, spin the cranks. If the motion stops abruptly or you hear a grinding noise coming
from the bearings, the bearings need to be adjusted or re-greased by your Fisher dealer.
Also clean the chainrings and inspect them for damage. If the teeth are bent or broken
the chainring should be replaced by your Fisher dealer. Note that on some chainrings, a
few teeth have a special shape to enhance shifting.
Fig. 37
Cassette
Chain
Pedal
Chainring
Crank bolt
Fig. 38