On Wed, Sep 23, 2009 at 2:03 PM, Dominic <dmorellonh@...> wrote:
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> I was rummaging through the old threads and came across this one which I found
interesting becuase on my ride yesterday my boom creeped in a bitbit. I thought
it might be because the chain is too tight and when I shift in to the high gears
it puts too much stress on the boom. My did come with a plastic insert alread in
the boom, it has a lip that fits around the edge of the boom. I also have one of
those grey square thingines and I didn't know what it was for. After reading
this I went down and tried to slip a piece of the plastic thing into the boom
but no luck. If I have to do that I will have to disassemble the front end and
then re-assemble it. Is it worth it or should I try lengthing the chain first
and see what happens?

Hey Dom,

You can check if the chain is too tight by shifting to both larger
cogs front and back and check if the rear deraileur becomes
horizontal. Move the rear deraileur from cog to cog upwards with the
chain in the larger chainring and if it becomes horizontal at any
point you may need to increase the lenght of the chain. If you don't
use those combinations you can keep the chain shorter. It will last
less than if it is longer, since there are less pieces in the chain to
wear out, but it will maintain more tension in the chain when you ride
on the smaller cogs making it jump less with bumps.

From my experience when you ride harder, the boom can slip inside the
frame if the screws that lock it in place aren't well tightened. You
have to tighten both those black knobs that hold the boom and the
screws under the frame will also do that job. So tighten both if you
won't be adjusting the boom when riding (to let someone try it out).

Do some videos of your rides if you can. :-)

Cheers!