The Speed was only 2 . 75 and 4 , no 6 for them . The only other difference is the rounded butt of the Speed frame . The parts all interchange among the three of them to the best of my knowledge . There was also some Postal Inspector variant but the finer details escape me at the moment . <| sep |> Just something to think about , but the body is all connected . We like to think of it in pieces , but that ' s just for convenience . But even when you divide it up into pieces , the fascia is one that covers the entire body . When you stretchflex a muscle fascia is along for the ride . The magnitude of this effect will vary depending on the relationship between the pieces , but it ' s always there . By the way , you might consider doing some stretching for your toe point . If the front of your footleg is looser , the muscles on the back of your leg won ' t have to work as hard to point your toes .