Hey I have this brand new 2007 R1 front master sitting here... Is this a 16X18 or mm?????

 

They work well but they aren't the same as the Brembo 16x18

 

man **** haa , how much you sellin it for or are you i just bought a 05 636 master

 

that master works great for hb

 

chances are it's a 19mm.

almost all front brake master cylinders are 19mm since they have dual 4 piston calipers you need a bigger piston. they have slowly gotten bigger and bigger but i think they stopped at 19mm (just slightly larger than 3/4")

 

Its a Brembo but not the 16x18. The 16x18 is designed for single caliper front ends.