I have an '07 Bianchi Volpe. Great bike, I like it lots but I have a problem: When cruising along at a fast cadence if I'm shifting up, occasionally my chain will stay hung up on the smaller ring, at the bottom, while at the top of the ring the derailluer is doing its job moving me up a gear. What happens is the chain wraps around the bottom of the smaller ring until I pedal to a point where there's no more slack and my chain jams, pedals stop, progress ceases. I've broken one chain from this already. I also have a Fisher mtn bike and it has what's called an "anti chain suck bracket" so obviously this isn't an uncommon problem, but I cant find anything that will fix MY problem on my Bianchi. Any Ideas?