1983 Bianchi Randonneur Drive Train issue
This is my first post, and I am not the most knowledgeable about bikes, but am learning fast so please bear with me.
I purchased a 1983 Bianchi Randonneur on saturday, and whilst it is in beautiful working order in 80% of ways, the drive train is causing me some problems.
I took it down to my local bike co op for a workshop last night, and we discovered that their is some misalignment between the chain rings.
Some basic info:
Suntour Friction shifters and derailleurs the rear derailleur is a 3000, not positive of the front. It has a 3 ring casette on the front, 22-36-48, and a six speed on the back.
The issue is presenting in that when I am in the lowest gear up front and try to upshift, it will not go onto the second ring, and will only shift all the way to the largest ring. We tried replacing the chain with a newer one with little jumps on it to help the shifting along, didn't work. We also replaced the front derailleur with a Shimano 600 as there was a little bit of a wiggle in the original, again, this did not fix the issue.
We then looked at the chain alignment. When it is in the lowest gear front and back the chain is definitely veering to the right, as if it were cross-chaining. This means that the front and back casettes are misaligned, with the front casette being further out than the back.
The mechanic suggested that we move the rear casette out by moving some of the spacers around and re truing the wheel. This is a big job and I am a little hesitant to leap into it. He seemed to think this issue was caused by someone converting it from a two ring to a three ring up front causing the casette to be pushed out, but researching shows me that these bikes came with a 3 ring casette.
I guess my main question is, has anyone ever experienced this issue before, both the chain jumping the second ring and the misalignment.
Please excuse any abuse of terminology. I am learning, but if I am incorrect please call me on it, how else do you learn?
Further side note: I am doing these repairs myself at the co op with a bike mechanic teaching me what to do, I am planning on riding to San Francisco this summer so am trying to educate myself prior to that.
ETA: Both derailleurs were aligned properly as well, and the front chain ring cannot get any closer to the frame without the chain rubbing.
Last edited by bianchi83; 04-09-13 at 12:25 PM.
Reason: grammar, ETA