Shock Absorbing Seat Posts

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Can you guys (and gals) give me some advice on a shock absorbing seat=20 post?
I don’t want to buy one only to find out that it was never=20 suited for use on
a Muni. =20

Like what brands have you tried? Which ones work the best? What do they cost?
What’s the outer diameter of the post? And what about an adapter to mate up with
the mounting bolts on a=20 Miyata seat?

Thanks in advance

Chris Reeder Moscow, Idaho =20

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<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 3.2//EN”> <HTML> <HEAD> <TITLE>Shock
Absorbing Seat Posts</TITLE> <META NAME=3D"GENERATOR" CONTENT=3D"StarOffice/5.1
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NAME=3D"CHANGED” CONTENT=3D"20000208;22205600"> </HEAD> <BODY> <PRE><FONT
FACE=3D"courier, monospace"><FONT SIZE=3D4>Can you guys (and = gals) give me
some advice on a shock absorbing seat post? I don’t want to buy one only to find
out that it was never suited for use on a Muni. </FONT></FONT>

<FONT FACE=3D"courier, monospace"><FONT SIZE=3D4>Like what brands have y= ou
tried?</FONT></FONT> <FONT FACE=3D"courier, monospace"><FONT SIZE=3D4>Which ones
work the bes= t?</FONT></FONT> <FONT FACE=3D"courier, monospace"><FONT
SIZE=3D4>What do they cost?</FON=
T></FONT>
<FONT FACE=3D"courier, monospace"><FONT SIZE=3D4>What’s the outer diamet= er of
the post?</FONT></FONT> <FONT FACE=3D"courier, monospace"><FONT SIZE=3D4>And
what about an adapt= er to mate up with the mounting bolts on a Miyata
seat?</FONT></FONT>

<FONT FACE=3D"courier, monospace"><FONT SIZE=3D4>Thanks in advance</FONT=
></FONT>

<FONT FACE=3D"courier, monospace"><FONT SIZE=3D4>Chris Reeder</FONT></FO=
NT>
<FONT FACE=3D"courier, monospace"><FONT SIZE=3D4>Moscow, Idaho </FONT><=
/FONT></PRE> </BODY> </HTML>

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Re: Shock Absorbing Seat Posts

Hi,

Definately it is important to get a high-end seatpost. For MUni use, the basic
criteria are that the design can be modified (ie the seatpost shortened), that
it has good torsional resistance, and that the post diameter fits your MUni.

Tube diameter is a big limitation- many of the best posts don’t come small
enough. USE do, but they are very expensive. Bell makes a cheap 25.4mm post that
may not last too long, but it seemed the best of the cheap options. CODA posts
are fairly expensive and I actually had problems with them (I used to have one,
and it wore out quite quickly. there was a pin connecting the rail-attachment
clamp to the post that sheared through the post). Trapezoidal designs are
torsionally strong, but are fairly expensive and are designed for a slanting
seat tube (like all bikes and the Telford unicycle). Without a slanting seat
tube, their geometry does not work as it was designed to and a telescoping
design will provide more travel.

If you have a large enough seat tube (at least 27mm), I would recommend the Rock
Shox post, which I’ve had for about 8 months with no problems. This is how I
modified mine to fit my unicycle:

  1. Take it apart. It consists of an inner tube, an outer tube, and a rubber
    elastomer that rests on the bottom of the post against a tensioning screw.
    Take the tensioning screw and the elastomer out.

  2. Measure the longest possible length of seatpost that you can fit in your
    unicycle. The longer it is, the more travel you will have. Cut off the post
    at this length.

  3. re-tap the screw threads at the bottom of the tube to fit the tensioning
    screw again.

  4. The elastomer will probably be too long now. Throw it out. Replace it with a
    spring from a Manitou brand front fork shock (I used the medium-strength
    spring), which is the brand I found fit the best in the seat tube.

  5. Put it back together and you’re done.

Note: seatpost shocks work best if the unicycle has a seatpost tube that is no
longer than about 3-4". If it is longer, the clamp tends to pinch the
outer and inner tubes together in the shockpost, restricting its motion.
If this is a problem just cut the unicycle seat tube down, and put on a
quick-release clamp.

The ride you get is absolutely incredibly more comfortable- I can ride trails
all day and not be sore at all. I personally feel that this system should be
standard equipment on future high-end MUni’s- probably it will when higher
priorities such as strong axles get sorted out first.

Hope this helps.

-Kris Holm.

Currently I am using a Rock Shox post, which is working really well.

but I wouldn’t but my first one

— Chris & Jennifer Reeder <reed8990@uidaho.edu> wrote:
> Can you guys (and gals) give me some advice on a shock absorbing seat post?
> I don’t want to buy one only to find out that it was never suited for use
> on a Muni.
>
> Like what brands have you tried? Which ones work the best? What do they cost?
> What’s the outer diameter of the post? And what about an adapter to mate up
> with the mounting bolts on a Miyata seat?
>
> Thanks in advance
>
> Chris Reeder Moscow, Idaho
>
>


Do You Yahoo!? Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com

RE: Shock Absorbing Seat Posts

> All you guys with shock absorbing seat posts, what did you use as an interface
> between the bicycle post and the uni seat?

I used Geoffrey Faraghan (yes, he fits under a seat).

Actually, he did my post differently from his original ThudBuster on the Telford
prototype: http://www.sports-psych.com/muni/ The prototype allowed the seat
angle to be adjusted, but was too tall to fit my carbon frame. Also my frame was
not angled like the Telford so we cut away more of the top part of the post
(above the mechanism) and angled it appropriately for the Miyata seat to which
it was attached. Then he welded on a plate to bolt directly to the seat. And I
don’t even know if I have a picture of that.

In other words, some customizing will be required. One approach is to put rails
on the bottom of your seat. I prefer beefing up the plate under Miyata seats
anyway, so I will see if it can be combined with the post, and some welding.

Stay on top, John Foss, the Uni-Cyclone (reply to jfoss@unicycling.com)
http://www.unicycling.com

“Who would ever steal two #$%&@|!@%% MUnis! No matter what they do, they’ll
never get a mountain bike out of it.” - John Foss on February 1, 2000

Re: Shock Absorbing Seat Posts

Hi there,

I have used the USE seat post, it has a 25.0 OD, this appears to be standard. I
had to have it shortened and it works but has quite a bit of movement on it
after a few years use.

Roger

----- Original Message ----- From: Chris & Jennifer Reeder <reed8990@uidaho.edu>
To: uni <unicycling@winternet.com> Sent: Wednesday, February 09, 2000 6:20 AM
Subject: Shock Absorbing Seat Posts

Can you guys (and gals) give me some advice on a shock absorbing seat post?
I don’t want to buy one only to find out that it was never suited for use
on a Muni.

Like what brands have you tried? Which ones work the best? What do they cost?
What’s the outer diameter of the post? And what about an adapter to mate up with
the mounting bolts on a Miyata seat?

Thanks in advance

Chris Reeder Moscow, Idaho


 The UK's Unicycle Source <a href="http://www.unicycle.uk.com/">http://www.unicycle.uk.com/</a>

Re: Shock Absorbing Seat Posts

All you guys with shock absorbing seat posts, what did you use as an interface
between the bicycle post and the uni seat?

Chris Reeder

Re: Shock Absorbing Seat Posts

Roger,

    Cannondale makes a suspension seat post that has a linear bearing like a
    fatty head shock. All Cannondale components are manufactured under the
    name CODA. The post's bearing configuration is an equilateral triangle
    creating three running surfaces. The post is held against three needle
    bearings plates. It can't easily develop any side slip. I believe the OD
    of the post is 25mm, you'll have to check this though. It's not cheap at
    around $140.00 US but good stuff never is. I've seen the post and it
    runs smooth as silk and is well made. Should be good for MUni stuff if
    the overall length works for you. I'm not sure if it can be cut shorter.
    Good Luck.

“The Muniac”