The installation manual (yeah, I read it) says the module and the sensor can be no more than 12 mm (about 1/2 in) apart. The problem is trying to attach my module to the bike frame - the shape of the bottom stay in the rear triangle is oval so the module wants to flop down in the way of the crank arm and that just won't work. I tried the seat tube and main tube but they are too far away from the crank arm / sensor to pick up. Anyone else run into this problem?