Vee brakes need levers that pull more cable than Road/U Brakes/Cantilever brakes. MTB BB7s are designed for use with v brake levers, so the odyssey lever won't pull enough cable for it work properly. The road BB7 is designed for use with road levers*, which work the same as the M2 lever. *i have never used a road bb7 or modern road bike, so all this is an educated guess.