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This
ingenious technique - a trick pulled straight from the
magic hat of track legend GIOVANNI
PETTENELLA - enables the secure assembly of a track
sprocket without having to use the traditional lock ring
too. This is very handy as it enables you to use hubs
that don't have space for the lockring, and inverting
the rotational directions shown it is possible to remove
the sprocket without having to use special tools.
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1) loosen chain
Thread the sprocket
onto the rear hub by hand and secure snugly. With
the chain resting on the bottom bracket shell and
on the rear sprocket, place rear wheel in the horizontal
dropouts. The chain is now loose.
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2) wrapping the chain
With the rear wheel
firmly secured to the frame, slowly wrap the chain
around the sprocket in such a way as to trap it
inside the chain itself.
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3) tighten chain
Keep wrapping the
chain around the sprocket until it is taut, on one
side tightly wrapped around the sprocket and on
the other around the bottom bracket shell.
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4) securing the sprocket
Grip the rim of the
wheel firmly and rotate in an anti-clockwise direction
(avoid applying excessive force as this may damage
the threads of the hub). With this technique it
is possible to apply a tightening torque much greater
than that available using a chain whip: the force
is applied at a distance which coincides with the
radius of the wheel instead of the much smaller
radius of the sprocket, greatly increasing the leverage.
The lock ring is now unnecessary.
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