64
Crank Set
The crank set refers to the Bottom Bracket axle and bearings,
the Crank Arms and Chainrings.
Your bike may be fitted with either One Piece Cranks, where the crank
arms and bottom bracket are a single component, or Cotterless Cranks,
where the crank arms bolt onto the bottom bracket axle without using old
fashioned type cotterpins.
The one piece system is simpler and requires less maintenance, while the
cotterless system requires a little extra care.
Inspection
The crank set should be checked for correct adjustment and tightness
every month. Cotterless crank axle nuts must be kept tight, and the
bottom bracket bearings must be properly adjusted.
Remove the chain and try and move the cranks from side to side with
your hands. The cranks should not move on the axle, and there should be
only very slight movement in the bottom bracket. Next, spin the cranks. If
they don’t spin freely without grinding noise, then adjustment or lubrica-
tion will be needed.
Also check that there are no broken teeth on the chainrings, and wipe off
excess dirt and grease that may have built up on them.
Never ride your bike if the cotterless cranks are loose.
This may be dangerous and will damage the crank arms
beyond repair.
Crank Arm
Dust Cap
Axle Nut
Chainwheel
Ball Bearing
Fixed Cup
Axle
Lockring
Adjusting
Cup
Standard Bottom Bracket Assembly (Cotterless)
Tapered Axle
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