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sachs 'new success' RD meltdown(7 posts)

sachs 'new success' RD meltdownjsandin
Sep 27, 2001 10:23 PM
two days ago I bought an old (mid 80's maybe) peugeot 'triathalon' for use at school. tonight on my way home the rear derailleur, a sachs 'new success', self destructed. the inside plate of the hanger came off, and parts were thrown everywhere. It was dark, but I was able to collect the following parts: one cog, one 'bearing' (small metal cylinder that fits in cog hole), one of apparantly two washers to go on the side of the cog, one of two screws to hold the hanger together, and the inside plate of the hanger. The outside plate is still attached to the RD, which is otherwise intact. At the very least, I'm missing one cog, one washer for the cog I have, and the other screw that holds the hanger together. If there were bearings underneath the washers, then they are also gone... what are my options for repair? Is there hope for this bike? Can I get these parts, or a replacement RD anywhere?
Thanks for any help. Sorry for the imprecise language, I'm totally new to bike repair.
re: sachs 'new success' RD meltdownscottfree
Sep 28, 2001 6:50 AM
Sure, you can find plenty of replacement RDs cheap. I'd do that instead of trying to repair the old Sachs. Even with your bike shop putting it on, you could get away with spending less than fifty bucks.
re: sachs 'new success' RD meltdowndzrider
Sep 28, 2001 8:08 AM
Sounds to me like a lbs could fix you up with a missing screw, a couple of washers and one or two (if the one you have is worn) derailleur pulleys. If the derailleur index shifts well with the levers and freewheel you have, fixing it may be simpler and more satisfactory than replacing it.
Either way, it's not an expensive fix. Go for it. nmscottfree
Sep 28, 2001 11:54 AM
re: sachs 'new success' RD meltdownjsandin
Sep 28, 2001 9:17 PM
Hi all,

thanks very much for all the help. i went back in search of parts, but found nothing. i explained the situation to one of the guys at the shop, and he said repair wouldn't be a problem, so i'm satisfied.

however, one issue remains: i've looked at the rear DR more carefully, and realize that when i bought the bike, it was set up with only one pulley - the place where the other pulley would have gone was always empty. in this configuration, on the RD side the chain formed half a trapezoid ( some crude diagrams: /=o===O, instead of zo===O )... does this make sense to anyone? is this a valid RD setup, or does the chain always have to snake under one pulley, and around the other? if its an invalid setup, then it might explain why the hanger fell apart...

thanks again for all your replies.
re:probably had fallen apart once already. nmdzrider
Oct 1, 2001 6:38 AM
re: sachs 'new success' RD meltdownJofa
Oct 3, 2001 3:52 PM
this isn't valid and it wouldn't shift properly, or even ride at all, with only one pulley. But as others have said, pulleys are cheap, available and, significantly, generic: you could use Shimano, Campag, or aftermarket ones. There's a fuss often made about a 'floating' top pulley, but I think this is a leftover from pre-indexed systems where everybody (manufacturers included) forgot what it was originally designed for- preshifting- and instead decided that it was all about desirable 'overshift' in index systems, or something. I wouldn't worry about it as fixed pulleys work fine. The Sachs NS equipment is fine quality and worth repairing. Good luck,