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Updated 23/05/07RAOM0507 Apollo Bicycle Company Pty. Ltd. ABN: 60 001 914 469
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Crank Set
Together the bottom bracket axle and bearings, the crank arms and the chainrings are
known as the crank set. There are two types of crank sets - One Piece Cranks or Three
Piece (Cotterless) Cranks. One Piece Cranks are relatively easy to maintain as the crank
arms and the bottom bracket are a single component. In Three Piece Cranks the crank
arms bolt onto the bottom bracket axle without using old fashioned type cotterpins.
This system requires more detailed servicing.
Inspection and Maintenance
Every month the crank set should be checked to ensure that it is properly adjusted.
For Three Piece Cranks:
- Check that the crank axle nuts are tight.
- Adjust the bottom bracket bearings as necessary.
- Remove the chain and test for crank movement on the axle by attempting to move
the cranks from side to side with your hands. Only very slight movement in the bottom
bracket should be noted.
- Rotate the cranks. Adjust and oil if they do not spin freely or a grinding noise
is detected.
- Check the chainrings for any
broken teeth, and clean off any
excess dirt and grease.
Caution:
Always ensure that your
Three Piece cranks are
firmly secured before
riding. Riding with loose
cranks is potentially
hazardous to both the
rider and condition of the
crank arms.
Dust Cap
Axle Nut
Crank Arm
Tapered Axle
Chainwheel
Ball Bearing
Lockring
Fixed Cup
Axle
Adjusting
Cup
Standard Bottom Bracket Assembly (Cotterless)