Originally Posted by
Het Volk
I have been trying to find a simple photo that can be easily used to identify the difference between a Type A and Type B braze-on.
in addition, A uses a 5mm screw while a B uses the narrower, uncommon 4.5mm screw.
Note: top frame is Type B, bottom is Type A
I hope this helps
RJ the Bike Guy - Shimano Type B shifter boss
I have a recently acquired Cilo frame with the type B bosses and the links posted above were very helpful. I think I am going to modify cable stops since I want to use handlebar mounted shifters but I’m still deciding between bar-ends or brifters. Either way, I need cable stops.
If one chooses to stick with downtube shifters, the only 3 options are clamp-on shifters (aesthetically unpleasant to my eyes) or the other 2 varieties you can find in the links above which are specific to these bosses.
The most extreme but effective solution is having the more common bosses brazed on but that would involve refinishing the frame.