Hi all, just wondering about I problem I have with my new Giant Reign 3 mountain bike. It has 27spd LX derailers, running on a 9spd Sram cassette and Race Face Evolve XC crankset. The problem I have hving is that the derailer keeps jumping off the inner chainring onto the BB. I know where everyone is going to start with the adjusting the cable tension and inner stop. These were not adjusted properly at first but I corrected this, and now if I spin fast while changing down it will jump off. Otherwise it seems to work ok. The derailer is adjusted to just clear the chain while I am in the biggest cog on the cassette and the smallest chainring. can anyone give me an idea of what to look for next ?