A while ago I updated my wife's bike (a Raleigh road bike with Reynolds 531 tubes) to an index-shifting setup--yes, it was a long time ago. The original equipment was something by Suntour, and the upgrade was Suntour Superbe Pro: rear cogs (I think it's still a freewheel), deraileur, and shifters. Sounds like I did a good thing. Of course the bike is stored in the garage collecting dust particles....