rolf f wrote:
Though of course the benefit is only achieved when braking from the hoods. From the drops it's the same.
True, although this is my commuting bike so most of my time is spent up on the hoods keeping an eye on the traffic. I've not measured the pivot-cable distance on them, but I suspect the mechanical advantage is much the same as the previous levers.
rolf f wrote:
What centre pulls has your bike? The Corsair I renovated has I think 610s. They have a lovely even, strong spring pull with a very smooth movement spoiled only by the fact that they are made of cooked pasta.
It's almost fascinating on a steep descent watching the brakes blocks press into the rim whilst you continue to move the lever to the handlebars whilst the brakes bend gracefully! Then of course you realise your minimum speed on this gradient is 30mph........
Mine are 610's too. I think they're lovely-looking, nicely-designed brakes, but they can be a bit flexy. I'm not sure how much of this is the caliper arms themselves bending and how much is the pivot bolts flexing outward. One fix for the latter is apparently to fit a second U-shaped bridge (possibly by cannibalizing a spare set of 610's) with extra-long pivot bolts so that the caliper arms are sandwiched between the two bridges. This is basically just like a brake booster for cantilever brakes. I've not done this yet, but then I haven't done any real descending. If I find myself inadvertantly shooting through junctions at the bottom of big hills I may try it out.