P3 aluminum
fsa team crank with FSA 54T chainring up front.
105 front derailleur
if you shift from big ring to small, while in the smaller half of the rear casette, the chain goes between the two chainrings and never catches the small ring.
adjusting the FD stop so that it moves further inward doesn’t seem to help.
any ideas?
Only time it ever happened to me was when I had a bent chainring. Take em off and lay em on a perfectly flat surface and make sure you didn’t bend ont.
what type, brand, and model of chain exactly?
seen it a couple of times. First one the small chainring was on backwards from the factory and the second time was due to exessive chain stretch despite it only being 2 months old.
What size is the small chain ring? Maybe it’s too small, and when you shift down, it’s too far of a drop for the chain to catch? Then – because your on the small side of the cassette – the chain gets pulled away from the small chain ring, and you end up with the chain stuck in between???
seen it a couple of times. First one the small chainring was on backwards from the factory and the second time was due to exessive chain stretch despite it only being 2 months old.
I would definitely check into what was said above about the small chainring being installed backward. The retaining nuts fit into a shallow depression in the small chainring. If it is on backward things don’t work properly. How do I know this? I’ve done it.
small chainring was on backwards
x2
.
seen it a couple of times. First one the small chainring was on backwards from the factory and the second time was due to exessive chain stretch despite it only being 2 months old.
I would definitely check into what was said above about the small chainring being installed backward. The retaining nuts fit into a shallow depression in the small chainring. If it is on backward things don’t work properly. How do I know this? I’ve done it.
Good idea. The other side to this problem could be a 10 speed chain with an 8 or 9 spped crank. The spacing is slightly different, I believe. But the above seems more likely. The tabs on the chainring should have a step cut into them where they fit agaainst the chainring and the distanance from the inside “face” of the big ring, to the center of the tooth on the small should only be half to 3/4 of your chain width (I think, beacuse it makes perfect sense, whereas having the gap as wide or wider than the chain does not).
i bet its the chainring on backwards, bolts don’t look recessed like they should be.
ill check that out, thanks!
seen it a couple of times. First one the small chainring was on backwards from the factory and the second time was due to exessive chain stretch despite it only being 2 months old.
Might just be a manufacturing problem- FSA Gossamer from '07 was known to have this defect- happened to mine and to a friend’s. It only happened when new, and seemed to go away after a few hundered miles (about 300). I read about it on roadbikereview.com forums.
I had the exact same problem with a Cervelo P2C.
Cervelo and FSA were aware of the issue and FSA sent two new chainrings b/c there was a problem with the spacing between the two rings.
FSA replaced the rings free of charge (with help from the LBS).
It happens occasionally with my Felt S22. It doesn’t happen if I am aggressive in my shifting but if I slowly shift the chain will go between the rings. Fortunately, while the chain slips it still moves so I just push the lever down all the way and it pops into the small ring. Happened at the bottom of Beach Hill at Wildflower this year. I’ll check to see if the small ring is on backward.
Might just be a manufacturing problem- FSA Gossamer from '07 was known to have this defect- happened to mine and to a friend’s. It only happened when new, and seemed to go away after a few hundered miles (about 300). I read about it on roadbikereview.com forums.
Yeah, the owners probably got sick of the problem after a few hundred miles, took it apart and realized the factory had put the ring on backwards. :@
How old are the rings?
Check if your small ring is mounted correctly. If it is and it still happens, get a new small ring.
I understand how this might be a problem in the spring … but it’s the end of July … does your grandmother want to borrow your bike?
