I am in serious need of some bicycle mechanic expertise! I have an early 90’s Trek T200 tandem that I picked up from my LBS part-way through a bottom bracket and headset rebuild job. I became uneasy about some of the inconsistencies I was getting about the needed parts and prices from the LBS.
Now I have several bags of parts and a stripped down frame sitting in my living room. I’ve sorted and cleaned the parts and I have some technical questions.
1.) There is a plastic “accordion-looking” thing that has/had rubber o-rings at both ends. It is imprinted with “TIOGA” on it. It obviously came from somewhere in the bottom brackets. Two things about this…I am only finding one in the bag of parts and it has been mangled by my LBS. What is the purpose of this part, where does it go, and why is there only one on a tandem (meaning did my LBS throw the other one away?)
2.) There are two spindles in the bag of bottom bracket parts that I received back from my LBS. One is 132mm long and other is 126mm long. Which spindle goes is which position, captain vs stoker? Maybe even more importantly, I am no bike mechanic but it is pretty obvious the one set of bearings, cups, and spindle is severely pitted with rust. Both sets of cups are Tange K1 1.37x24T. I am finding new cups sets on-line for about $20 each, but a new spindle appears to be a little tougher to find. Since I am probably going to have to replace at least one spindle, how much more difficult or is it even possible to convert the open style bottom bracket to a cartridge style system. Is the taper on the spindles pretty much universal for all square-holed Shimano crank arms or is there a whole other can of worms to consider with how various tapers mate with various crank arms? Does the eccentric cause any complexities with an open to cartridge bearing bottom bracket conversion?
Once I get through some of these issues, I’ll probably have more questions about the headset rebuild. It’s really rough and bearings are probably shot.
Thanks In Advance for Any Assistance You Can Give,