Re: esoteric front derailleurs....

this won't get used off road....although it MIGHT see a few unpaved
roads.

but i'm not looking to top routing to keep the mud out...but i've
always admired the look of the cross bikes that have all the cables
routed with the top tube. looks much better than downtube cable
routing.

this bike will see more urban streets so you're right about the
chainrings....BUT....it would be nice to have the option to use a
single or double. it's only going to have 4 cogs mounted on a specific
hub.

no racing.....at all....ever.

but you're right about finding parts that can easily be found. that's
something i need to keep in mind.

this bike isn't really going to be a road bike in the general sense.
most road bikes these days are far too limited for general use. i
think what rivendell offers makes more sense than the usual cookie
cutter frames found these days in bike shops.

i just need something more practical.




bjw@xxxxxxxxxxxxxxxxx wrote:
sal bass wrote:
i'm using campagnolo bar cons instead of indexed shimano.

also...the clamp-on pulley did cross my mind...but just for a second.
i can't see clamping on something to a $3000 + custom frame. seems
wrong. and yes the fabricator will integrate one...but that really
isn't the point.

If Campy barcons are friction on the front, then you can use pretty
much any derailleur with the right capacity. But I still don't know
any top pull FDs that are rated above 48t. The Shimano XT
conventional (high clamp not low clamp) ones from a couple
years back would do 48t - I think the number was FD-M751.
The high clamp ones were rated to 48 while the low clamp ones
were only rated to 44t, IIRC. I have barcons and a top pull FD
(even though my frame has a pulley) but my big ring is only 46.

The pulleys do work. Given this is a custom frame, you could get
a pulley anyway, for flexibility if you change your mind later. Or
you could get bottom pull cable routing. The reason to get top pull
cable routing is to keep mud and gunk out of the cable. Most people
who need this don't also need road chainrings, since a 52 is awfully
big off-road. A 48/12 still gives you a pretty big top gear.

IMO, if you are going to race and/or ride off-road a lot, it is a good
idea not to make your frame dependent on a rare component, such
as an unusual derailleur. RIding off-road, especially in muck, uses
components up more quickly.

Ben

.

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