18 is the fulcrum-to-piston distance in mm, not the overall length of the lever.
A fulcrum-to-piston distance affects two things: the amount of force needed at the lever, and the distance that the lever needs to be pulled through (to displace and compress the same amount of hydraulic fluid which in turns forces the caliper pistons against the rotor discs) to yield the SAME stopping power.
http://ducatisportingclub.com/xmb/vi...age=#pid155760
Shazaam!
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