I know that this is going to sound pretty lame, but up until now my bike, a Trek 7.2, has been perfect, a joy to ride. I decided to give it a proper clean last week, gave the chain some attention (hot soapy water, soft cloth, running the chain thru' the cloth to de-gunk it etc). I also used an old toothbrush on the cogs and stuff. I wasn't sure about lubing so asked Mr BP what to use and on which bits - he used the right stuff on the chain and also something on the derailleur. Anyway, I was going to go out yesterday but it didn't feel right, and hubby identified that the chain was slightly touching in 2 and 3 on the big rings. Unfortunately for me, he has been to a beginners maintenance class and decided that he knew how to adjust the derailleur and proceeded to fettle to the point that the cable fell out. Cue trip to the LBS (thanks guys at All Terrain, Saltaire) they basically put it back together, acknowledging that there is an art to derailleur adjustment. Last night we did a short 6 miler and although the gears are back in working order, it isn't the perfect machine that it had been before I decided to clean it, it just isn't the same. I thought that it might all bed back in but it hasn't. Should I take it back to the LBS, smile sweetly and ask them to tweek it a little more?