Right off the yoyodyne website:
The 19x18 cylinder has better modulation, given its marginally longer
operating travel when compared to the 19x20, which on the other hand
offers a slightly quicker response.
As a general rule, the 19x18 is recommended for bikes with 4-piston calipers
(diameters 32/36, 34/34 and 30/34), whereas the 19x20 is more suitable for
other calipers.
Brembo experience favors 19x18 for track, and 19x20 for street.
My words:
The important thing is the ratio of surface area between the master
cylinder and the slave cylinders. Switching to a smaller diameter master
cylinder will be "touchier" at the lever, because it will be easier to create
the same amount of force on a smaller surface area.
An easy example:
10 lbs on 1 square inch = 10 PSI
10 lbs on 1/10 square inch = 100 PSI
__________________
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Last edited by IrocRob; 07-17-2008 at 08:09 PM..
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