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Old 05-16-12, 07:08 PM   #1
trek330
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braze on front derailleur adjustment

Any one have any tricks on lining up a braze on derailleur if it doesn't line up with the chain line too well.I've been haveing alot of difficulty.My FD is an old Shimano 600.I got it to work pretty well but the cage is not completely parralel with the chain line or front cogs.I had an old suntour with a screw so you could move it laterally.Am I missing something on the Shimano?
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Old 05-17-12, 08:02 AM   #2
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I'm not sure if your problem is that the rotational alignment isn't right or the derailleur won't swing in and/or out far enough. Most braze-on frame tabs allow for rotational adjustment and the in and out problem is addressed with the limit screws.
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Old 05-17-12, 08:11 AM   #3
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I mean rotational.How do you adjust rotationally?Clampons you just twist on the tube.
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Old 05-17-12, 08:21 AM   #4
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I mean rotational.How do you adjust rotationally?Clampons you just twist on the tube.
As I mentioned, the braze-on frame tabs I've seen allow the derailleur to be rotated a fair bit before you tighten the hold down bolt. If yours locks the fd into position rigidly, I guess the cure is to get out a round file.
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Old 05-17-12, 08:23 AM   #5
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Thanks,I'll try it.
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Old 05-17-12, 08:24 AM   #6
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Those I've used have allowed me sufficient rotational adjustment. If it's any consolation I consider the FD to be the touchiest adjustment anywhere on the bike.
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Old 05-17-12, 12:37 PM   #7
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To manage lateral-rotation, I loosen the clamp bolt just a tiny bit. I position the L-shape allen key vertically and unscrew the bolt 1/4 turn so it aims sideways outwards. Then use the allen-key as a lever to spin the derailleur. When it's at the proper rotation, tighten the bolt with the key.
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Old 05-17-12, 09:29 PM   #8
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To manage lateral-rotation, I loosen the clamp bolt just a tiny bit. I position the L-shape allen key vertically and unscrew the bolt 1/4 turn so it aims sideways outwards. Then use the allen-key as a lever to spin the derailleur. When it's at the proper rotation, tighten the bolt with the key.
That's pretty much it, but you want to make sure there is no tension on the shift cable or your height will go out of whack on you while you're doing that.
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