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Old 10-03-09, 04:59 PM   #1
freeranger
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First non-successful bike repair......

Just a little ticked off as I'm writing this. The front (triple) der. on my Lemond Reno broke last time out. Had one heck of a time finding a 9-spd front der. with a 34.9 band. When I did-it won't work! THe old der. Was a braze on style with a 34.9 band which accepts a braze on style der. Apparently, the regular clamp on style(non-braze on style der) must be a tad wider or something. Can't get it into high gear without the outside of the der cage rubbing the crank arm. If you adjust to where it doesn't rub the crank arm, it won't go into high gear. And apparently Shimano no longer makes the tripe 9-spd braze on front der any longer. THanks a pantsload, Shimano. Guess I'll try a 10-spd braze on next-since the cage is a little narrower, it might work. Just a little frustrated right now-it's the first mechanical job on a bike which wasn't successful. Of course, I've always worked on mtn bikes before-which seem to be more forgiving. Guess maybe it's off to the shop- but I'd rather fix it myself-rather than admit defeat--anyone run into a similar problem?
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Old 10-03-09, 08:36 PM   #2
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I'd want to think that all of Shimano's modern 9-sp FDs have cages that are of identical or almost identical width. If that is the case, then it would seem doubtful that slight variations among clamps should cause an issue. Of course...that may not be the case.

Is the high limit screw allowing the cage to travel past the large chainring an unnecessary distance? Is the cage aligned with the chainring?...or is the crank arm catching the front of the cage at an angle?

I found these NOS Shimano 9sp/Triple/Braze-on FDs:

Shimano 105 FD-5504

From ebay:
Tiagra FD-4503
Dura-Ace FD-7703
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Old 10-03-09, 09:27 PM   #3
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How did your original FD break?

Can you take some pictures of your new front derailler showing the issue of it hitting the crank arm? Something doesn't seem right.
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Old 10-03-09, 09:51 PM   #4
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Like desert I was thinking a 105 triple . . .

https://www.bikebuster.com/details/4...0&currency=usd

I was under the impression that the braze on's were all pretty standard, at least the 10 or so clamp/braze on FD's that I've encountered.

as JJ951 said, photos?
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Old 10-04-09, 07:48 AM   #5
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Ebay
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Old 10-04-09, 08:03 PM   #6
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Quote:
Originally Posted by desertdork View Post
I'd want to think that all of Shimano's modern 9-sp FDs have cages that are of identical or almost identical width. If that is the case, then it would seem doubtful that slight variations among clamps should cause an issue. Of course...that may not be the case.

Is the high limit screw allowing the cage to travel past the large chainring an unnecessary distance? Is the cage aligned with the chainring?...or is the crank arm catching the front of the cage at an angle?

I found these NOS Shimano 9sp/Triple/Braze-on FDs:

Shimano 105 FD-5504

From ebay:
Tiagra FD-4503
Dura-Ace FD-7703
Thanks for the link--the e bay one (Tiagra- one on the left of the pic with 2 ders. in it) is what I had, and works--believe me-there is no way to get the regular, banded derailler to shift into high gear at all, without it grazing the crank arm. Must just be the slightest difference--you would think the cages would be same width-but something is definitely different-going to make sure I can order the braze on der. on the left of the pic-that is what I had, and it worked great-until the "teat" that the held the spring broke off!

Last edited by freeranger; 10-04-09 at 08:04 PM. Reason: correction
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Old 10-05-09, 05:41 AM   #7
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Please, post some photos. I'm really curious why your FD is hitting your crankarm. I have to believe it's an adjustment issue but I've been wrong before.
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Old 10-05-09, 06:20 AM   #8
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If you had a Shimano Road Bike front derailleur before and replaced it with a new Shimano Road Bike front derailleur it should work with little complaint. If it is hitting the crankarm then it is almost certainly an adjustment issue.
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