Hi guys, sorry if this is in the wrong section!
As some of you may know I've recently gotten a hold of a Raleigh Randonneur that I've started working on. Now, the bike didn't come with a derailleur, and how silly of me it was to think I could simply bolt a new one on! The rear hanger was completely threaded, so much so I could simply push the new one all the way through the hole. So, while I'm waiting for the LBS to order in a dropout saver, I'm using a cheap clamp-on derailleur to use in the meantime (something like this http://compare.productwiki.com/shimano-rd-ty18/#gallery
So far so good, right? Wrong.
On my first ride, I could barely pedal without the chain slipping and making a horrendous noise. Bear in mind, this was with a brand new chain. So, I bought some new (well, second-hand but still plenty of life left) chainrings, as it appeared to be slipping at the front. Also, there seems to be little wear to the rear cassette. But no, the problem was still there.
I took it out for a ride just now after fitting the chainrings, and although the problem seemed to be SLIGHTLY better (the old ones were completely worn) the chain was still slipping like crazy, and kept jumping off the chainset and jamming itself. However, I kept on going and up a slight incline not only was it slipping to the point I was at almost a standstill, but the chain snapped and bent the pin! I had noticed earlier that half of a link had dislodged itself (I hope that makes sense) but thought nothing of it and assumed I must have been careless when fitting the chain.
Also, I know it;s not the freehub that is worn, as I used it without issue as a single speed the other day to get to work.
To make matters worse, some little s**t slashed my front tyre while I was at work the other day, so I need to fix this one enough to get me to work and back tomorrow! Needless to say I'm not too happy!
Anyway, that leaves either the cassette or the derailleur at fault. I have a feeling that the cheap derailleur I'm using simply isn't tensioning the chain enough, and as a result the chain is slipping through it; I've compared it to the one I plan on fitting, and the spring is MUCH stronger on that one.
Also, I'm using a friction shifter (bar-end) at the moment, it has no trouble moving the derailleur, but maybe the lack of indexing may be causing the problem?
Would a weak derailleur spring cause slipping like this? Would fitting my new derailleur fix the problem? Is it an issue of a lack of indexing? Have any of you guys experienced anything like this?
Also, I have included a few photos to illustrate what is going on here.
I really appreciate any input you guys have for me, I'm tempted to throw the thing in a skip right now!!!