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Old 11-06-05, 12:07 PM   #1
wrdaigle
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To drill or not to drill

I am in the process of building up my first bike. The frame is a 2001 Jamis Aurora. I was just about to install the shifter cables and I ran into a little snag. The problem is...the downtube cable stops aren't actually mounted on the downtube. They are mounted way up on the head tube. The nice part about that is that they set out in front of the head tube and therefore have room for built in barrel adjusters. The problem comes when routing cables for the front canti brake and the derailleurs. When Jamis built the bike up, they used a fork mount cable hanger. I couldn't seem to find one of those, so I used a headset mount hanger instead. Only problem, I can't turn the wheel without the brake cable hitting on the derailleur cable housings. A poor design in my humble opinion, but I guess you get what you pay for. Correct me if I'm wrong, but I see 3 potential solutions:

1. Find and install a fork mount cable hanger. I hesitate to do this because there is very little clearance between the canti yoke and the derailleur cable stops. In other words, I think the cable housings will still put pressure on each other when I turn sharp. Anyone else see this as a problem on the aurora.

2. Mount clamp on cable stops on the downtube. Then I will also need to incorporate some sort on inline barrel adjuster for FD fine adjustment.

3***. This is the one I need to be talked out of. I could just drill and tap the down tube and install the cable stops that came with my STI shifters. I have the tools and know how, but I'm not sure whether or not this would create a week spot in the frame. These DIY brazeons wouldn't be reinforced like a usual brakeon. The nice thing about this setup is that I may be able to pack along an cheap downtube shifter and have a place to mount it if I ever had trouble with the STI shifters while I'm on the road.

Any thoughts????
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Old 11-06-05, 12:20 PM   #2
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I know exactly the bare brake cable to derailleur cable housing rub you're talking about. My newly built LHT does a little of that, although my derailleur cable housings route down at the traditional stops. One solution would be to install a length of nylon cable liner sleeve over the exposed brake cable, which I also intend to do myself. But as you will see, under normal riding, those cables will not rub against each other.

Last edited by roadfix; 11-06-05 at 12:40 PM.
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Old 11-06-05, 01:10 PM   #3
wrdaigle
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My setup is certainly a little tighter than that. With a shifter cable installed, the brake engages when it turn hard right or left.

BTW...nice LHT!
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Old 11-06-05, 01:22 PM   #4
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Quote:
Originally Posted by wrdaigle
With a shifter cable installed, the brake engages when it turn hard right or left.
Yes, that sometimes happens. But under normal riding conditions, how often do you actually turn your steering to those extremes?......perhaps only during those very slow, hard, tight U-turns.
But judging from your photos, I would imagine you can alter the lengths of your cable housing to clear that brake cable. There will be rubbing, but I don't think it's a major problem.

Last edited by roadfix; 11-06-05 at 01:35 PM.
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Old 11-06-05, 02:59 PM   #5
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Would something like this work for you?

http://www.rivbike.com/webalog/shift...urs/17109.html
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Old 11-06-05, 06:28 PM   #6
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You're talking about installing the studs that the cable stops screw into, right? No simply tapping the downtube and trying to screw the cable stops directly into that?

Tapping the downtube sounds like a bad idea. The metal is extremely thin so there won't be more enough threads to hold a screw. If you want to mount cable stops on the downtube, you are going to need to have studs brazed on. Maybe there's a brazeless method, like a rivnut and a special stud for it?

What about simply installing V-brakes instead of cantis? They should bolt onto the canti mounts on the fork and need no hanger. It should solve you problem.
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Old 11-06-05, 08:52 PM   #7
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Quote:
Originally Posted by wrdaigle
When Jamis built the bike up, they used a fork mount cable hanger. I couldn't seem to find one of those
is this what you're looking for? (sorry, cant do pics)

http://sheldonbrown.com/harris/cable...ecablehardware

but if it came down to 1,2 or 3, I'd go with 2.
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Old 11-06-05, 11:05 PM   #8
wrdaigle
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Quote:
Originally Posted by supcom
You're talking about installing the studs that the cable stops screw into, right? No simply tapping the downtube and trying to screw the cable stops directly into that?

Tapping the downtube sounds like a bad idea. The metal is extremely thin so there won't be more enough threads to hold a screw. If you want to mount cable stops on the downtube, you are going to need to have studs brazed on. Maybe there's a brazeless method, like a rivnut and a special stud for it?

What about simply installing V-brakes instead of cantis? They should bolt onto the canti mounts on the fork and need no hanger. It should solve you problem.

Actually, I WAS talking about tapping the downtube directly, but I came to the same conclusion as you -- too few threads. For those of you looking mount studs, here is nifty idea:

http://cgi.ebay.com/SHIMANO-STI-CAMP...QQcmdZViewItem

Apparently the old shimano clamp on downtube shifters have binding posts built in. So, if you come across a set of those, just remove the thumb shifter and Voila!

Anyway, my LBS had a double clamp on cable stop, so I'm going that route. Thanks for all the help. All is installed and working great.
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