What can influence 'indexing'... I can either set the bike up so it indexes for the last four or the 1st four sprockets on the back. Somethings stopping the bugger indexing over all the sprockets; The stops are ok - the cables are lubed: its a Tiagra mech on 9sp. sprockets. Any suggestions NB - I do know how to set the bike up and can do everything on a bike other than true a wheel (really good) so I know what the deal is / have skill. But this has just floored me and Id rather try and sort it myself than take it to the shop unless i have to!