|ultegra front derailleur upsetting me!||got2ryd|
May 28, 2001 7:19 AM
|i have a new bike with ultegra sti. at first, when down shifting from 53 to 39, it would throw chain past smaller ring and derail. i adjusted the throw slightly on the front derailleur and checked the chainline, which seemed ok. next ride, same thing. next, i loosened the cable attached to the front derailleur. figured if it was too tight, its causing the front derailleur to "snap" free with excess force slamming it into the chain and causing it to derail. this seemed to be the fix and i have not had a problem for a few rides, but it happened again yesterday. any other suggestions? oh, and i plan on posing the question to my lbs where i bought the bike. thanks!|
May 28, 2001 10:02 AM
|first, make sure the cage sits about 2mm over the big ring. Set this by the frame band clamp position. Then, shift to the biggest rear cog, and the small front ring. Then, set the clearance from the inner plate and the chain to .5mm using the screw closest to the seattube. Then, take up cable slack and snug the cable bolt up. Be sure you are in the low gear position on the front STI lever first! Then, shift to the smallest rear cog and the big front ring, and using the screw furthest from the seattube, set the clearance from the chain to the outer plate to .5mm. You may need to then slightly adjust the cable tension barrel adjuster on the downtube (near the headtube) to make minor adjustments. Good luck, and this ought to do it.|
|ultegra is infamous for doing this||bianchi boy|
May 28, 2001 8:02 PM
|On my bike, even when properly adjusted by the bike shop, it occasionally throws the chain when shifting from the 53 to 39 chainring. I finally solved the problem by installing a "Chain Watcher" made by Third Eye, I believe. This is a plastic thingie that you clamp to your seat tube even with the front derailler, and it prevents the chain from falling off the small chain ring. Haven't had a problem since I installed it about 3 months ago. I bought my Chain Watcher at REI for about $10. Not sure if any catalogues carry it, but I'm sure someone does.|
|re: ultegra front derailleur upsetting me!||Dirk Lenart|
May 29, 2001 12:47 PM
|Check out the Park Tool site. It has THE way to adust front and real derailers.
This method really works!
|very cool link Dirk...thanks!||Bob in Indiana|
May 29, 2001 10:06 PM
|re: ultegra front derailleur upsetting me!||Jim A|
May 31, 2001 1:23 PM
|If you have to add a device to prevent chain drop, I highly recommend this one.