it depends on up or downshifting. Before auto-blipping downshifting was common, upshifts were handled with a momentary cut in the ignition. Maybe and yes. I currently have one of those 15T front sprockets on order from Rottweiler... or should say, back-ordered. It's been nearly a month. So you can order it from them, but it will take a while. As for the gear-jammer; I like it. I'm also a guy that never passes up a chance to add to the toolbox, especially if it means I can complete a task solo and without assistance.