I talked to Jeremy Wilkey today and he was quite excited about this article.
http://www.mx-tech.com/?id=articles_new ... &type_id=1
http://www.mx-tech.com/?id=articles_new ... &type_id=1
interesting pds article
- Thread starter SFO
- Start date
-
- Tags
- article interesting pds
Man, Jer has been the crazy believer in pds.
He is dedicated to making this system work.
It still startles me that I might actualy forgo a link.
He is dedicated to making this system work.
It still startles me that I might actualy forgo a link.
Excellent article on the pds system. I have been told some of the same things by my suspension tuner for some time now.
What is also interesting is the relationship between the needle profile, length, and whether or not a progressive or straight rate spring is used.
With the Husaberg 2001 shock, which had a relatively long tapered needle, a straight rate spring was desirable due to the linear increase in damping via the long tapered needle with a constant change in diameter. However, those bikes came with a progressive rate spring that made the ride rather rough over the small chop, but, good in absorbing the big hit. However, the stock shock came with too little rebound for western US conditions. So what would happen as the shock compressed is that as the needle diameter was getting bigger and closing off the bypass relative to the shaft position, and at the same time the spring rate was ramping up which gave a rather abrupt change in compression resistance, and as the suspension became unloaded, it would rebound too quickly which could remove the rider rather quickly.
In contrast, the later model shocks came with a short fatty needle, and due to it's profile would benefit from the progressive spring to help ramp up compression resistance before the abrupt bypass cut off.
I found the article enlightening as well as inspiring that some research is being done to help refine a very promising design.
SFO, when you talk to JW again let him know that we liked his article. And thanks for posting the article.
What is also interesting is the relationship between the needle profile, length, and whether or not a progressive or straight rate spring is used.
With the Husaberg 2001 shock, which had a relatively long tapered needle, a straight rate spring was desirable due to the linear increase in damping via the long tapered needle with a constant change in diameter. However, those bikes came with a progressive rate spring that made the ride rather rough over the small chop, but, good in absorbing the big hit. However, the stock shock came with too little rebound for western US conditions. So what would happen as the shock compressed is that as the needle diameter was getting bigger and closing off the bypass relative to the shaft position, and at the same time the spring rate was ramping up which gave a rather abrupt change in compression resistance, and as the suspension became unloaded, it would rebound too quickly which could remove the rider rather quickly.
In contrast, the later model shocks came with a short fatty needle, and due to it's profile would benefit from the progressive spring to help ramp up compression resistance before the abrupt bypass cut off.
I found the article enlightening as well as inspiring that some research is being done to help refine a very promising design.
SFO, when you talk to JW again let him know that we liked his article. And thanks for posting the article.
Similar threads
Register CTA
Register on Husaberg Forum! This sidebar will go away, and you will see fewer ads.
Sign Up
