A fixed gear bike has a single fixed sprocket screwed onto a thread on the back wheel. The power of the drive screws the sprocket on tighter.
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00:06 Step 1 - Lock-ring Thread
A hub dedicated for fixed gear use has two threads the inner thread has a larger diameter. The fixed sprocket screws on here on a standard right-hand thread. The outer thread has a smaller diameter a lock-ring screws on here on a left-hand thread. A hub with only one thread can be used with a fixed sprocket but the wheel can’t be used as a foot brake. The sprocket may unscrew under the force of braking.
00:37 Step 2 - Unscrew The Lock-ring
Use a lock-ring spanner to unscrew the lock-ring by turning it clockwise.
00:57 Step 3 - Unscrew The Fixed Sprocket
Use a chain-whip to grip the fixed sprocket. Turn the fixed sprocket anti-clockwise to unscrew it. It may be wound on tight and require plenty of force to start it moving.
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8 окт 2014
