All right, lets talk about suspension. As I mentioned at earlier post, I just got my self a Sportbike Suspension Tuning book by Andrew Trevitt. I look forward to learn about suspension setting and try to implement the knowledge I gain to my sportbike.
I highly recommend the book, especially if you interested to know about sportbike suspension. The basic concept of Spring, Damping, Geometry and so forth are all very clearly described. Good stuf!! If you want to learn about sportbike suspension go get a copy of this book.
The first setting that I will try is to set my bike “sag” and adjusting its “preload”. This shall be the first step in suspension setting. I have my bike suspension set already at my club. That setup will become one of the reference for me to do this setup. I have: the standard CBR setup from CBR Owners Manual, my club setup, and a recommended CBR setup from Sport Rider magazine.
Sag shall be a starting point for suspension to work. So setting sag properly will ensure that the suspension work on its recommended range. The book shows how to measure sag for both front and back. With the help of the pit mechanic I measure and its involving measuring the front fork tube while you on and off the bike. I found the front sag to be about 22 – 23 mm. Bit low but normal for race track use. With this kind of sag you will need then to adjust the preload accordingly.
For less sag, you will need stiffer preload, while for more sag the preload need to be adjusted softer. Based on the sag measurement of my bike I will then need more sag. Thus I will need to have softer prelaoad setting.
Prelaod setting at my CBR are at the top of the front fork. I will need 19 mm wrench to adjust it as in the top picture. I use the recommended SportBike setting, which apparently similar with the setup that I have used. Which is 10 turn counterclockwise from full stiff. This will be my front preload setup.
As to rear preaload, the adjustment was bit tough as it hidden at the rear shock. But after checking the setup, the measurement are the same from the standard CBR setup with the recommended by SportRider and what I have used which is position 4 from full soft. Bellow pics shows its location:
Now, I have set the preload which is 10 turn counterclockwise from full stiff for front; and position 4 for the rear. Next shall be the rebound and compression damping.