Fork Damping - Position vs Speed sensitivity

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Fork Damping - Position vs Speed sensitivity JayC 07-29-2008
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Posted by JayC on July 29, 2008, 11:03 am


I've recently heard some "suspension expert" make references to
position-sensitive damping in modern forks. I've seen the innards of
several, and AFAIK, there are no position-sensitive components in
modern damping-valve forks - valves are 100% speed sensitive and,
other react the same regardless of where in the stroke you are -
personally, I think this guy was full of crap. OTOH, I haven't had
the displeasure of tearing apart the forks on either of my new bikes,
so I don't know if there are some new wiz-bang gizmos stuffed in
there. Do the new 391-chamber forks that all the MX bikes use include
any position-sensitive components?

JayC

Posted by Mike W. on July 29, 2008, 1:15 pm



>I've recently heard some "suspension expert" make references to
>position-sensitive damping in modern forks. I've seen the innards of
>several, and AFAIK, there are no position-sensitive components in
>modern damping-valve forks - valves are 100% speed sensitive and,
>other react the same regardless of where in the stroke you are -
>personally, I think this guy was full of crap. OTOH, I haven't had
>the displeasure of tearing apart the forks on either of my new bikes,
>so I don't know if there are some new wiz-bang gizmos stuffed in
>there. Do the new 391-chamber forks that all the MX bikes use include
>any position-sensitive components?
>
>JayC

I got my suspension done twice by those guys up by you. That old guy mx-er
(#5) used to race for them. Something Suspension. In at least two different
conversations with them about the rather under-suspended initial state of
the XR, they noted I was riding in the harsh part of the stroke where the
suspension damping is more aggressive. The first time I got it back from
them, I felt I was finally up in the plush part of the stroke. HUGE
difference. IIRC, Burleson said the same thing that time. That is, the
comments were that the damping I experienced was driven by where I started
in the stroke. So one data point is that what they said satisfied what was
observed. Can't think of how the forks would "know" where they are, but
that was the POV they offered.

Mike


--
Mike W.
96 XR400
70 CT70
71 KG 100 (Hodaka-powered)
99 KZ1000P (training)
99 KZ1000P (rider)
00 Beta Rev-3

Posted by on July 29, 2008, 6:24 pm


:
> >I've recently heard some "suspension expert" make references to
> >position-sensitive damping in modern forks. =A0I've seen the innards of
> >several, and AFAIK, there are no position-sensitive components in
> >modern damping-valve forks - valves are 100% speed sensitive and,
> >other react the same regardless of where in the stroke you are -
> >personally, I think this guy was full of crap. =A0OTOH, I haven't had
> >the displeasure of tearing apart the forks on either of my new bikes,
> >so I don't know if there are some new wiz-bang gizmos stuffed in
> >there. =A0Do the new 391-chamber forks that all the MX bikes use include
> >any position-sensitive components?
>
> >JayC
>
> I got my suspension done twice by those guys up by you. That old guy mx-e=
r
> (#5) used to race for them. Something Suspension. In at least two differe=
nt
> conversations with them about the rather under-suspended initial state of
> the XR, they noted I was riding in the harsh part of the stroke where the
> suspension damping is more aggressive. The first time I got it back from
> them, I felt I was finally up in the plush part of the stroke. HUGE
> difference. IIRC, Burleson said the same thing that time. That is, the
> comments were that the damping I experienced was driven by where I starte=
d
> in the stroke. So one data point is that what they said satisfied what wa=
s
> observed. Can't think of how the forks would "know" where they are, but
> that was the POV they offered.
>
> Mike
>
> --
> Mike W.
> 96 XR400
> 70 CT70
> 71 KG 100 (Hodaka-powered)
> 99 KZ1000P (training)
> 99 KZ1000P (rider)
> 00 Beta Rev-3

I've seen a new style prototype MX fork that has chambers on both ends
of the forks. It looks really wild. Can't find the pics right now but
will post a link if I can.

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