Where am I going wrong here: Clutch slave/master sizing ?

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1 Post By AC Ventura

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02-28-2018, 12:12 PM

spdbrake

CC Member

Join Date: Dec 2015

Posts: 1,442

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Your theory and math look correct. With a 1.25" throw on the 3/4" master cyl your only going to see 3/4 of the resulting travel on the 1.0" slave. You'd need to get a 1.0" master to achieve the same travel at the fork. Which it looks like it would just make your numbers needed.
Using Wilwod masters as a base a 1.125" master would overdrive your slave a bit if you wanted to go that far and be safe.
Wilwood Disc Brakes - MasterCylinder No: 260-10376

Or drop the dia of the slave to 3/4" to maintain a 1:1 movement-reaction ratio with your current master.

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