Originally Posted by
Road Fan
Really this discussion is going on about two different things: a perception by the rider about how a bike responds, and a discussion about what is done in the design that might achieve that result. Getting those different types of imformation confused can lead to well, confusion.
Road Fan
I think the OP is asking for help connecting the two. The immediacy of the acceleration he feels is likely a function of a stiff bottom bracket, and stiff (read short) chainstays. I'm not expert in these things, so maybe someone who knows more could help out. What frame characteristics lead to a "responsive" feel?