Carbon Base and Thomson Seatpost

ivan said:

Is there any way to make it fit the Thomson seatpost directly, without a
rail adaptor?

Yes. Have you seen how Scott Wallis does the adapter for his CF seats?
It's custom for the Thomson seat post.

Someone here (Gerblefranklin? Catboy?) has fabricated a similar adapter
for their KH style CF base. It can be done but requires some custom
work and custom thinking.

--
john_childs

john_childs (att) hotmail (dott) com
Team Never Wash Your Muni
'My Gallery' (http://tinyurl.com/3d57bn) :: 'Unicycling Bookmark List'
(http://backcountry.unicyclist.com/) :: 'World Clock'
(http://tinyurl.com/2blym3)
------------------------------------------------------------------------
john_childs's Profile: http://www.unicyclist.com/profile/449
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Silly Ivan. I can't help you. I barely even read your post.

--
The.Mars.Volta

'Kidmuni.com' (http://www.kidmuni.com/Home)
'My Gallery' (http://tinyurl.com/2lotu6)
'YouTube Account' (http://www.youtube.com/profile?user=UNICYCLEORDIE)
Excuse me, is your fridge running? Because if it is it's probably
running like you, very homosexually.
-Peter Griffin
------------------------------------------------------------------------
The.Mars.Volta's Profile: http://www.unicyclist.com/profile/13719
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

john_childs said:

Yes. Have you seen how Scott Wallis does the adapter for his CF seats?
It's custom for the Thomson seat post.

Someone here (Gerblefranklin? Catboy?) has fabricated a similar adapter
for their KH style CF base. It can be done but requires some custom
work and custom thinking.

'Is it Kaycee you were thinking of?' (http://tinyurl.com/3c5dem)

--
saam

Sam 🙂

Ronnie said:

"Crippled but still keen, I salute you!"

------------------------------------------------------------------------
saam's Profile: http://www.unicyclist.com/profile/9168
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Hi Ivan,

Very simple just get a rail adaptor. They sell them ant UDC and MDC.

Unicorn

[image:
http://www.einradladen.net/shop/popup_image.php/pID/311/invis/0]

--
Unicorn

Keep your eyes on the stars and your feet on the pedals, and you will
accomplish great feats!

'The Unicycling Commune' (http://tinyurl.com/3xkd8d)
------------------------------------------------------------------------
Unicorn's Profile: http://www.unicyclist.com/profile/12801
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Just wondering, why are the thompson seatposts made like this?

--
jamessd

My videos:
http://uk.youtube.com/watch?v=WpBvnO6wVG0#GU5U2spHI_4

http://uk.youtube.com/watch?v=mtnedg1YS8c
Add me: [email hidden]
------------------------------------------------------------------------
jamessd's Profile: http://www.unicyclist.com/profile/15102
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

jamessd said:

Just wondering, why are the thompson seatposts made like this?

what do you mean? thompson seat posts are Bicycle seat posts first and
foremost. have you ever observed the way bike seats and seatposts
attach? bike seat posts attach to the rails of a bike seat. this
allows for more strength, and way more adjustability than to have a
seatpost bolt to a seatbase like with a stock unicycle.

thompson and de-rail is the way to go!

--
TrialsUni
------------------------------------------------------------------------
TrialsUni's Profile: http://www.unicyclist.com/profile/7986
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

TrialsUni said:

thompson seat posts are Bicycle seat posts first and foremost.

I assumed they were bespoke for unicycles.

--
jamessd

My videos:
http://uk.youtube.com/watch?v=WpBvnO6wVG0#GU5U2spHI_4

http://uk.youtube.com/watch?v=mtnedg1YS8c
Add me: [email hidden]
------------------------------------------------------------------------
jamessd's Profile: http://www.unicyclist.com/profile/15102
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

jamessd said:

I assumed they were bespoke for unicycles.

nope. we've just adapted them to our sport. i notice that the
freestyle end of the bmx crowd has too, in recent years. the reason is
that the thompson happens to be one of the strongest, if not, the
strongest post out there.

unicycling, in general, puts unique forces upon the seat/seat post
area. and with trials/street/muni the forces a seat post has to take
far exceed those of bicycling. not only does a seatpost have to take
downward forces, but also upward and other weird-angled
forces/stresses.

it's a lightweight, strong, and well designed product, albeit somewhat
costly.

evan

--
TrialsUni
------------------------------------------------------------------------
TrialsUni's Profile: http://www.unicyclist.com/profile/7986
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Unicorn said:

Hi Ivan,

Very simple just get a rail adaptor. They sell them ant UDC and MDC.

Unicorn

[image:
http://www.einradladen.net/shop/popup_image.php/pID/311/invis/0]

Not that simple, actually. It'll cost me 40 euros(because of the
shipping) and will add 200 grams(assuming it's okay to saw the brake
lever off the KH rail adapter) of weight to my uni. 200 grams of weight
mean nothing at all, but I still don't want them.

And that Kaycee thread is interesting, but it seems he had a normal
plastic KH base, not a cf one.

--
ivan

<<<<>>>>Sledgehammer for Jebus<<<<>>>>entropy isn't what it used
to be.

Trying is the first step towards failure.
-Homer Simpson-

------------------------------------------------------------------------
ivan's Profile: http://www.unicyclist.com/profile/12759
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Maybe I could cash out for a Scott Wallis base(what with my new job and
all...), but he says he won't take orders till next year. Does anyone
have a used Scott Wallis base they'd like to sell?

--
ivan

<<<<>>>>Sledgehammer for Jebus<<<<>>>>entropy isn't what it used
to be.

Trying is the first step towards failure.
-Homer Simpson-

------------------------------------------------------------------------
ivan's Profile: http://www.unicyclist.com/profile/12759
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

ivan said:

...Does anyone have a used Scott Wallis base they'd like to sell?

Sorry to be negative, but don't hold your breath on that one. Scott's
saddles are the best, and precious few of them have been made.

--
unisk8r
------------------------------------------------------------------------
unisk8r's Profile: http://www.unicyclist.com/profile/4660
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

ivan said:

And that Kaycee thread is interesting, but it seems he had a normal
plastic KH base, not a cf one.

It's been done at least twice with a CF base. I just don't have
pictures and can't find the threads where it has been mentioned. It
can be done. But you'll need to use some engineering smarts to come up
with a design that is strong and robust.

Also take a look at 'this thread'
(http://www.unicyclist.com/forums/showthread.php?t=44469) for ideas.
It includes good pictures of the Scott Wallis CF base.

You could also rig up something similar to the KH adapter pictured
there. Weld or epoxy a half cylinder to a KH 4 bolt plate. Rig up
some way of attach and adjust the two adjusting bolts on the seatpost.
I'd follow that route. Something where you use the KH 4 bolt plate and
the standard 4 bolt holes. That will be stronger and also allow you to
switch over the KH rails adapter if necessary or other compatible
seatpost mount options that may come in the future.

The bigger advantage of going rail-less is that you won't have to worry
about your fingers getting caught under or between the rails. More
friendly for trials and street style riding.

--
john_childs

john_childs (att) hotmail (dott) com
Team Never Wash Your Muni
'My Gallery' (http://tinyurl.com/3d57bn) :: 'Unicycling Bookmark List'
(http://backcountry.unicyclist.com/) :: 'World Clock'
(http://tinyurl.com/2blym3)
------------------------------------------------------------------------
john_childs's Profile: http://www.unicyclist.com/profile/449
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

The concept JC describes is used on alot of BMX saddles, but with one
bolt attachment into the center of the post, like the pic. You don't
have to use a serrated semi-circle mount, Scott Wallis' is actually
smooth and the 2 bolts provide enough clamping force.

+-------------------------------------------------------------------+
|Filename: macneilimpseat.jpg |
|Download: http://www.unicyclist.com/attachment/23506 |
+-------------------------------------------------------------------+

--
unisk8r
------------------------------------------------------------------------
unisk8r's Profile: http://www.unicyclist.com/profile/4660
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Hmm, good idea. I've got a 4-bolt plate broken off my old seatpost. If I
can attach to Thomson, it will make a very good seatpost.

--
ivan

<<<<>>>>Sledgehammer for Jebus<<<<>>>>entropy isn't what it used
to be.

Trying is the first step towards failure.
-Homer Simpson-

------------------------------------------------------------------------
ivan's Profile: http://www.unicyclist.com/profile/12759
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

I'll be following this thread with much interest...

Wouldn't a "tilted" (see picture) 4bolt post allow you to get a
horizontal rear portion using the KH Freeride. And if so are there any
that are ones longer than 250mm as I think that is what my KH 24 came
with and it's just barely long enough with a rail adapter.

[image:
http://www.einradladen.net/shop/images/big_sa1082_tryall_seat_post.jpg]

--
412
------------------------------------------------------------------------
412's Profile: http://www.unicyclist.com/profile/14317
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Zack Baldwin and Ryan Atkins once rode with carbon fibre bases attached
to thompson posts before the wallis base came around.

I don't their exact methodology in constructing a means for the two to
be attached, or how effective their results were. Zack rode his
unicycle that way in Defect, and there are just a couple tiny shots of
Ryan on the Semper alum. frame where he rode with this seat
arrangement. So, I don't know what the weaknesses were, if any. This
was around 2004/5.

Maybe you could ask Ryan about it, or maybe someone will read this
thread and post what they know.

Here's a picture of what it looked like on Zack's old uni. You can see
that he constructed a carbon fibre piece for it to work on the outside,
but I don't know what he did to hold everything in place on the
flipside. I jacked this from unicyclejester.com:

+-------------------------------------------------------------------+
|Filename: IMG_0805.jpg |
|Download: http://www.unicyclist.com/attachment/23509 |
+-------------------------------------------------------------------+

--
TrialsUni
------------------------------------------------------------------------
TrialsUni's Profile: http://www.unicyclist.com/profile/7986
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Zack, Ryan, and I all did this. The way I did mine was I took the bottom
plate of the thomson rail holder and sanded it until it fit the
contours of the cf base. Then I drilled for the two bolt holes. I
sandwiched two pieces of thick innertube between the plate and the base
to keep it from scratching the cf. I was never particularly impressed
by the results, but it did work. From an engineering perspective, i
think the rail adapter is much stronger for a host of reasons.

Zack got that second piece of cf from a cf base he snapped a while
back.

I actually do have an extra de-rail base right now (miyata foam, duct
tape cover, kinport handle) since I'm only riding one unicycle, but
damned if I'm ever gonna part with it. Right now it's hanging on the
wall in my dorm room as a piece of art. It's very classy. When the day
comes that I decide to rebuild my trials uni, I'll have that seatbase
ready.

--
gerblefranklin

(Shut up and ride)

http://gallery.unicyclist.com/Trials-Muni
------------------------------------------------------------------------
gerblefranklin's Profile: http://www.unicyclist.com/profile/4295
View this thread: http://www.unicyclist.com/thread/65798

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com