Dale Brown wrote:
>
> In a message dated 5/30/2003 5:13:09 PM Eastern Daylight Time,
> Cushdelmar@aol.com writes:
>
> << Auto shifting wasn't
> much of a problem until some of the early lightweight frames began
> appearing. Strong riders were able to torque the frame and cause the
> bike to shift. Never seems to be a problem now. >>
>
> We are talking about two different things here.
>
> The initial topic was the shift levers slipping in their internals. This has
> been a chronic problem with Campagnolo friction down tube shifters since I
> started messing with them in 1972 and probably before..The solutions have been
> described already.
>
> The other issue is that of "auto-shifting when the frame is flexed when
> climbing or jamming and the frame actually flexes causing the rear derailleur cable
> to be tugged and the chain to hop onto another cog. It is feasible that the
> aforementioned tug also pulls the shift lever out of its position. This
> phenomenon obviously can only occur in the case of a very light gauge frame or a
> rider with a very pronounced plunging style (or both.)
Well you're right Dale, and I have to agree with previous posters. The chronic problem (outside of flexy light frames) is all about the tension screw being too long or there is flux or brass at the bottom of the threaded opening and is not allowing the tension screw to be tightened sufficiently. I always grease the thread and the steel keyed friction disc and even on the later version, the nylon friction disc. As has been posted, make sure that the tension screw is not bottoming out! Set up everything properly and your Uncle's Bob!
Chuck "send all of those defective Campagnolo parts to me for recycling" Schmidt L.A. http://www.velo-retro.com (Catalogo Campagnolo reprint and Timeline)
.