BRAKING MASTER CYLINDER'S CARTRIDGE Ø10 MM

F.I.R.S.T. (and IN.CA. S) are the only brakes on the market to have the
possibility to replace the cartridge, changing the diameter of the piston to
change the braking action.

With the 9mm cartridge you have a more linear but more powerful braking
action. The smaller area ensures higher pressures in the pipes (more power),
while the lower flow rate of fluid means that a greater stroke of the lever is
necessary to transfer the same volume of fluid to the caliper (greater
modulation).

With the 10mm cartridge you have a more immediate braking action at the
beginning of the stroke but less powerful. The larger area develops lower
pressures in the pipes (lower peak power), while the higher fluid flow rate
means that the lever stroke to transfer the same volume of fluid is lower than
the 9mm cartridge stroke (less modular, more ON/OFF).