The other day someone asked me why I sell ISR when there is a giant like Brembo readily available. And while I like and use Brembo (and really like Fred @ Yoyodyne) who distributes Brembo) I also like the quality, ingenuity and owner (Acke Rising) of ISR. I love the attention to detail and the though that goes into every piece to make it as light as possible, as versatile as possible and as smart as possible. Acke does nothing without deep consideration when it comes to the design and manufacturer of his products.
Here is a little technical information on why the ISR racing radial master cylinder is really a cool product that makes a single master cylinder possible to be used on a wide variety of applications for a wide variety of riders!
The idea behind this cylinder is to give the rider a possibility to adjust the leverage to suit his personal preferences. This is done by adjusting the ratio between the rider’s force applied to the grip and the pressure in the brake line. So either if the rider is using one or four fingers to control the brakes he still stays comfortable. You can easily adjust the mechanical ratio between 3:1 to 6,6:1 by hand without using any tools.
The drawing above illustrates a typical brake force which outcome in a brake pressure. The pressure is studied for different adjustments and cylinder diameters in the plot on next page.
Every step along the vertical axis represents one step marked on the 21‐012/014 cylinder. Notice the plus and the minus symbols which are marked both in the plot and on the cylinder. For a lower ratio adjust to the plus sign and for higher ratio adjust to the minus sign. So for an example, if you use a 14mm piston in the cylinder you can raise the brake pressure from approximately 3 bar to nearly 6,5 bar by adjusting the ratio from the lowest to the highest.
We offer this brake master cylinder in three bore sizes; 17.5mm, 15.87mm and 14mm. Since we are mainly Ducati oriented the 15.87mm master cylinder is what we generally sell and stock since it is proper for the Brembo 4 piston 2 or 4 pad calipers and pistons 25mm or less in diameter which come standard on most Ducati Motorcycles. The 17.5mm master cylinder is for 6 piston calipers and pistons 30mm or more in diameter. The 14mm master cylinder is for single caliper setups.
The 14mm master cylinder also works very well as a Ducati clutch master cylinder! The 15.87 can work as a Ducati clutch master cylinder as well, but we have the best results with the 14mm in this application.
For more information and an outlet to purchase these master cylinders please see desmoworks here:
desmoworks ISR master cylinder
Linear Mode
