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.)
Dale Brown cycles de ORO, Inc. 1410 Mill Street Greensboro, North Carolina 27408 336-274-5959 fax 336-274-6360 <A HREF="http://www.cyclesdeoro.com">cyclesdeORO.com</A> <A HREF="http://www.classicrendezvous.com./main.htm">ClassicRendezvous.com</A>