Just curious if anybody else experiences this and if it's exclusive to SRAM or if it's just because i'm shifting stupidly. When I'm in the big ring in the front and I'm starting to get into a cross-chain situation, I'll hit both levers at the same time so that I shift to the small ring in the front and shift to a smaller/harder gear in the back. When I do this, every once in a while, the drivetrain locks up and the rear derailleur gets sucked up and i think slams against the chain stay. I have never actually damaged anything from it happening and I just release tension on the pedals and it fixes itself. I avoid shifting in this manner as much as possible but was just curious if this is normal since the RD has so much slack to make up while it's trying to shift. So, anybody else have this?

Oh yeah, I think I've only noticed it on my Force bike and not on my Rival bike. The Rival is newer but I don't think that should matter.