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new ultegra...threw chain off twice. help!(12 posts)

new ultegra...threw chain off twice. help!sdda
Jun 17, 2002 9:17 PM
So I got a new full Ultegra group installed on my TCR-1 frame today, and I went for a ride and threw the chain off the front chainrings twice. Any advice for shifting up front? I'm new to road biking and don't want this to keep happening. At certain times when moving from the small chainring to the big one, it goes up onto it super-easily and others it doesn't and kind of hangs in between. Help!
Take it back to however installed it...........Dave Hickey
Jun 18, 2002 3:11 AM
It would be a couple of things. The most obvious is the inside limit screw. If you have your bike on the largest rear cog and the small chainring, the chain should just clear the derailleur cage. If there is too much of a gap, adjust the limit screw.
AgreeSpoke Wrench
Jun 18, 2002 5:01 AM
If you paid somebody to install it for you, they didn't get it exactly right the first time. You didn't say if it was a double or a triple. STI triples can be tricky to set up initially. I'd be for giving them a second chance.
Two more questions!namir
Jun 18, 2002 5:18 AM
I work, and the shop I took it to isn't open on the weekends (student-run shop at the University). Is this something I can try noodling around with myself? Which limit screw is the inside one?
post just abovesdda
Jun 18, 2002 5:34 AM
This is actually a friend of Namir's...I'm staying with him for right now. I had made a new account for myself, and then he logged back in this morning, but I posted thinking it was still me. Sorry for the confusion!
You need a Zinn book.Spoke Wrench
Jun 18, 2002 11:10 AM
Or else some crusty old bike junky to fix your bike. OK try this:

1. Dosconnect the front derailleur shift cable.
2. Align your front derailleur so that the outer cage is exactly parallel to the big chainring and just misses the big chainring by 1 to 2mm, no more.
3. Examine the limit screws. Figure out which one is the inner limit screw. Shift the chain into the big cog in back. Adjust the inner limit screw until the inner plate misses the chain by 1 to 2mm. no more.
4. Reattach the shift cable. Be sure you have it on the correct side of the fixing bolt. Pull it tight with your needle nose pliers and tighten the anchor bolt.
5. Try shifting and see what happens. You may need to do some cable tension adjustments. Adjust the outer limit screw so that the outer cage just misses the chain when in the big/little combination.

Good luck!
another problemsdda
Jun 18, 2002 6:07 AM
when in the small chainring and the smallest cog in the back, should I be getting any chain rub? I just flipped the bike upside down to look at some stuff, and noticed that i guess in 39x25, i'm getting the chain rubbing against the chainring and the derailleur cage. is this a limit screw issue?
another problemRomani
Jun 18, 2002 3:44 PM
Yep, that's normal. It's not recommended to run the inner chainwheel to outermost cog or large chainwheel to innermost cog. It's noisy, flexes the chain too much laterally, and probably overlaps a gear you already have.

If you want to run this combo, then you'll have to make a minor adjustment on your front derailleur to get rid of the chain rub. I don't know squat about Ultegra fr. derailleurs, 'tho. Does the Ultegra allow you to make minor adjustments to position the front cage so it doesn't rub after you've made your shift in the rear?
the permanent solution ...tarwheel
Jun 18, 2002 5:09 AM
This is a very common problem with Ultegra. Do yourself a favor and buy a device called the Third Eye Chain Watcher, which costs about $8-10 and is available at most bike shops and on-line stores. It's very easy to install, clamps to the seat tube near the front derailleur, and keeps the chain from throwing. It works. My Ultegra would periodically throw the chain no matter how many times I took it back to the bike shop for adjustments. Hasn't happened once since I installed the Chain Watcher. Not to start another Campy-Shimano war, but my Chorus group has never thrown a chain and I've never had to install a chain watcher on the bike with that group.
better than Third Eyeeflayer2
Jun 18, 2002 6:20 PM
Check out the N-gear Jump Stop. High quality gizmo that keeps chain from derailing onto your frame. The guy who makes these is really cool and will send you one in the mail. No payment required until you are satisfied. $10.

Check it out at:

I got one. It works.
eflayer - good link. I've had great success withsnuggleman308
Jul 3, 2002 6:31 PM
third eye but like the looks of this N-gear and will order one.

re: new ultegra...threw chain off twice. help!wsexson
Jun 18, 2002 8:26 PM
You may be having a different problem, but my bike (with Ultegra double) was doing the same thing when I first got it. The chain had one link that wasn't closed properly. I fixed that link with my multi-tool, and it has been shifting perfectly ever since.