These instructions relate to the
Shimano Dura-Ace left hand shifter, in the Jagwire holder for the
Due to the fact that the front
derailleur has a strong spring, it can be quite hard to shift into
the larger chainrings, with the normal bar-end shifters or twist
grips. So Shimano in its wisdom has made its Dura-Ace left hand
down-bar shift lever with a strong return spring to counter the
derailleur return spring. Thus when properly fitted, these levers
will give you easier shifting.
However, you MUST pre-tension this
spring when fitting the levers, or you may not get enough travel,
and worse, when the lever is in the most forward position, it will
severely bend the cable, leading to breakage in a very short time! I
will attempt to describe this process with pictures.
Fit the washer to the bar-end holder
is this position, with the tab pointing to the front of the trike.
Fit lever and pre-tension by
rotating stub clockwise until lever "clicks in" to washer.
Note this is easier to do when mounted on handle bar! Then fit the
cap and retaining tension adjusting screw, while firmly holding the
lever against the washer and holder.
This shows the high limit when
This shows the low limit when
correctly fitted. Note that there is a stop in the lever which
prevents it going too far forward and breaking the cable.
This is the WRONG way to fit the
Wrong way and no pre-tensioning
results in lever going too far forward and braking cable! Plus there
is no counter tension to balance the derailleur spring, making
shifting harder than it should be.