Hi folks. I've got a Shimano Sora triple front mech which is very reluctant to drop down on to the smallest ring. It just sits there and grates, even when the chain is on the largest cog in the rear cassette. Sorry if I'm teaching grannnies to suck eggs but on this mech, Low is "home" and you pull the cable tighter to change up a ring. Releasing the tension on the cable and a spring pulls the shifter across to a lower ring. Changing gear with the bike on a stand seems ok and, once it has changed, there is no problem. I've checked the cable isn't too tight and the "end stop" of the shifter isn't preventing it moving far enough across. The only other thing I can think of is that there is some friction either in the cable or in the mech that stops it moving across freely. The bike is virtually new and the lbs I bought it from will sort it if I take it back but I like to sort these things out myself if I can. Anybody got any thoughts?