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@Andrew
How/where do you measure brake drop? Sheldon's pages say it is the distance from the centre of the brake mounting bolt to the centre of the braking surface on the rim, but he measures it diagonally. Some sites/pages/advice says to measure it sort of straight down - from the centre of the mounting bolt to a point in between the two braking surfaces.... Is there any definitive answer?
Basically, I have a Shimano 4500 caliper which is a few mills too short, and want to look for a replacement with a longer drop - but need to know how long exactly.
At the same time, does anyone have a spare long(er) drop 4500 rear caliper?