Originally Posted by
crank_addict
Tom, thanks. It was done as an experiment after seeing a similar concept on an Alex Singer. Though the Singer used used a single chain link, and likely a thinner brake cable. No way could I fit two (straddle + pull) so I went to the set-up depicted which also helped the radius.
More about the MA leverage. The pull cables loop thru the pulley (chain link assembly) and affixed to a top clamp. The MAFAC levers have sufficient travel for this configuration but its something that needs to be considered if using other type or make.
This bike is used mostly for off-road single track and gravel. The mod allows single or two digit feather light pull at the lever. On the long crawling rough descents with rocks and roots, its very easy on the hands especially when positioned on the hoods. If there was improvement needed in doing this I'd like to try a modern thin cable and slight less stretch.
pads- I also removed the MAFAC holders and salmon Kool Stops. Found them too mushy. Much prefer these older Scott-Matthausers with a very thin material. Have another set of the same but experimenting with pad and adhesives. The homemade replacement pad rubbers are woven with nylon and molded into the rubber. Little pieces cut out of old conveyor belt, shaved on a belt sander to 3/16" thickness.
It's cool that you tried that. I've seen it too on Alex Singers and have wondered how it works out. Instant doubling of the mechanical advantage. Sounds like it does actually work in practice. I'd imagine you have to keep the wheel pretty true. Mafac levers certainly have room to spare. I get about 4.125" inches out of mine, compared to 3.125" travel on modern TRP RRL levers. That inch matters! Wish they'd make a long reach version.
FWIW I find that the black Kool Stops feel pretty close to the old Mafac pads, but it sounds like you are having fun experimenting with the old Scott-Matthausers.