Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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8-speed bar end shifters won't index perfectly with a 7-speed cassette. They'll come close, but it won't be perfect.
The installation has a number of fairly labor intensive steps, like retapeing the handlebar. Even the technical parts are pretty basic so this might be a job that you'd want to tackle on your own. The bar end shifters won't come with the cable stops that you need to replace your down tube shifters. Regular retail list price for the cable stops is about $10.00, but most bike shops have a drawer full of the things so, if they like you, you might be able to score a set for a greatly reduced price.