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New Dura Ace shifting problems

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New Dura Ace shifting problems

Old 04-04-05, 09:30 AM
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MacMan
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If it was a misfiring carburetor on a motorcycle, I'd be fine. I could take it apart and fix it no problem. Dura Ace rear derailleur however and I'm sunk!

I took my new ride out for a spin yesterday morning and the shifting was pretty awful considering this is Shimano’s top groupo. The rear derailleur wouldn’t shift on two different cogs in the rear depending on what ring I was in. I would have to shift twice to get it to move. Shifting otherwise was pretty smooth. shifting to the big ring seemed to take more effort than it should and shifting down to the small ring was really clunky. Without any weight on the bike - or more accurately, any real power through the pedals (i.e. on the parkstand or in the trainer), it shifted without issue and was way smoother. Also when riding, there was considerable “noise” from the bottom bracket area – every small crack in the road would cause a rattle in a way that my other Ultegra 9-speed never does over the same road.

I’ve taken it back to the shop where the owner’s first response was “no, it’s smooth” before agreeing to take it in to look at. This was a build on an E5 frame for racing so it has to be exact as far as I’m concerned. Any ideas on what it could be? Badly aligned FD and out-of-tension RD? I’d like to hear some thoughts rather than just rely on the LBS.

Cheers,
MacMan

Last edited by MacMan; 04-04-05 at 10:52 AM.
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Old 04-04-05, 10:38 AM
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Derailluer adjustment is more an art than a science. Probably it just needs to be dialed in. Most LBS mechanics don't get good at this skill for years. Probably whoever assembled this did a sloppy job. Sounds like the front is mis-aligned and the rear need to have it's SIS tension adjusted. The chain may be too long as well based on the front slap you describe. I'd take it to another shop thay sound lame
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Old 04-04-05, 10:54 AM
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Thanks. I'm due to pick it up tonight and will ride it early tomorrow morning. If it still doesn't feel good, I'll try another bike shop. It would be a bummer though as I don't see why I should have to pay for this to be set up correctly. Still, I'm racing on this so the set up is important enough that I'll pay twice to have it done right once! Interesting point about the chanin length - I'll bring that up when I go get the bike.
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Old 04-05-05, 09:01 AM
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OK, so the saga continues. I went to the LBS. Tried swapping out various spacers for the 10-speed cassette. No change. Derailleur adjustment didn't do any good. We even swapped out the wheel (American Classic 420) for a Ksyrium SSL and the same thing happend. Changed the hanger. No change. Changed the derailleur for a new one. Same thing. Slight improvement but downshifting into the high gears in the big ring felt like I was about to rip the teeth off the cogs - if you've ever dumped a clutch on a motorcycle, that's what it felt like. At this stage I'm wondering if the front chaning ring/cranks have been set up wrong or maybe the frame is whacked.

It sucks as I wanted to race it this weekend.
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