My chain falls off when I shift from the 50 to the 36 chain ring. I want to buy a chain guide to prevent this. But none of the three brands will fit the 12cm seat post of my Specialized Roubaix. (The three are Dog Fang, 3rd Eye and the Jump Stop.) Does anyone know of a similar product that will fit onto a 12 cm seat tube?
xo-1, riv atlantis, witcomb fixie, on-one inbred, bridgestone mb-1 w/ drops, bianchi reparto corse mtn bike, trek 650b'd touring bike
you just need to adjust your limit screws and or derailluer cable tension. try turning the inner limit screw ie the one closest to the seat tube, a half a turn tighter. if that doesnt work, try anouther half...