07-01-2004, 08:56 AM
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#9 (permalink)
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| | Re: Skip the front derailer?
In article <ec67e0hdaspkkosk1sfon2ff5dr1b3hom0@4ax.com>,
Mark Hickey <mark@habcycles.com> wrote:
> jthomas@northwestern.edu (Jeff) wrote:
> >I really don't need more than 7 or 8 gears, if they are
> >the right gears (in fact I only use 3 at the moment, not
> >counting the one I can't push). Is it possible to buy a
> >single chain ring and position it so that there is an
> >acceptable chain angle to all of the gears in the cassette?
> >Or is this too "non-standard" to be an option?
>
> You can do that, but leave the front derailleur on the bike to keep
> the chain from derailling.
Mark is right. I have a BMX with a 7-speed cluster and one ring on the
front. I had to add a front der to prevent repeated chain drops. With
the derailleur in place, everything just works.
You don't need to connect a shifter or cable to a front derailleur being
used as a chain guide. Just attach it to the frame and use the limit
screws to position it.
The hardcore one-ring option is to go mountain bike style, with
heavy-duty chainguides including tensioning rollers to bring the chain
in tighter and full guards on both sides of the ring. But I don't think
you're doing 6' drops on a bike with 7" of rear-wheel suspension travel,
are you?
--
Ryan Cousineau, rcousine@sfu.ca http://www.sfu.ca/~rcousine/wiredcola/
President, Fabrizio Mazzoleni Fan Club
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