Thompson Elite "Tuned"

Discuss light weight issues concerning road bikes & parts.
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rebizap
Posts: 142
Joined: Mon Nov 13, 2006 5:43 am
Location: Seattle

by rebizap

Had some free time at work yesterday. So it was time to tinker...
Down to 158g from 198g
It is a 31.6, was 287mm long and is now 240mm.
The centers of the head have been milled out, the edges have been trimmed back and the top of the post has been milled down.
This weight is with tuned stock steel bolts and barrels.
Attachments
Thomson small2.jpg
Thomson small.jpg

Nicola
Posts: 322
Joined: Tue Dec 23, 2003 4:48 pm
Location: Italy

by Nicola

nice works! I'm just planning to do the same with my Thomson seatpost....

by Weenie


Frans
Posts: 550
Joined: Wed Jan 25, 2006 8:32 pm
Location: Bow of a Farr 40

by Frans

Good work, can you do mine please? :-)

I already filed away the fwd part of the lower saddle rail clamp since it was cause abrasion to my cycle shorts (my saddle is as far back as possible) but I never imagined how far you could take it.

I suppose cutting it to length was by far the biggest weight saver. I once tried cutting a 400mm 30.9 Thompson post and it was not easy, the alu was quite hard. Is that because it's 7000 series? Most cheaper alu posts are soft as hell.

rebizap
Posts: 142
Joined: Mon Nov 13, 2006 5:43 am
Location: Seattle

by rebizap

Yes the 7000 series is pretty hard. But it does machine nice.
It doesnt seem to gaul up as much as softer alum.

The 45mm long piece of tube weighed out to 19g.
So there is about 15-20g from the head and bolts.
I think you take a little more off the head parts to get a few more grams but i figured this was enough for now.

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asphaltdude
Posts: 1234
Joined: Tue Aug 12, 2003 8:39 pm
Location: Holland
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by asphaltdude

Replacing the upper part of the clamp by something like this:

Image

could save even more weight....
Whow! That's a pretty damn nice garage door!

rebizap
Posts: 142
Joined: Mon Nov 13, 2006 5:43 am
Location: Seattle

by rebizap

That is a good idea!
Are those parts alum?

rebizap
Posts: 142
Joined: Mon Nov 13, 2006 5:43 am
Location: Seattle

by rebizap

oops....
Double post

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asphaltdude
Posts: 1234
Joined: Tue Aug 12, 2003 8:39 pm
Location: Holland
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by asphaltdude

http://weightweenies.starbike.com/forum ... hp?t=14674

Topic about Felix0rs tuning job on a Easton EC90 post :thumbup:
Whow! That's a pretty damn nice garage door!

SL58
Posts: 642
Joined: Tue Oct 30, 2007 5:02 pm

by SL58

Asphaltdude,
I replaced clamp like that with Thomson upper plate and I think
Thomson is lighter and better (Ridley Helium ISP).

rebizap,
now you need to watch all the dirt from back wheel
getting thrown under a saddle and falling down right on the BB.
Piece of tape on the upper plate?

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bobbyOCR
Posts: 1838
Joined: Sun Sep 03, 2006 1:55 pm
Location: Western Australia

by bobbyOCR

His BB should be sealed, and if he isn't mountain biking, he should be fine anyway.
Cyclist turned music producer

Visiting South West Australia? Visit Crank n' Cycles!

SL58
Posts: 642
Joined: Tue Oct 30, 2007 5:02 pm

by SL58

Here is Ti bolts and nuts for the post:

http://cgi.ebay.com/Thomson-Titanium-Se ... dZViewItem

Also the saddle cradle(lower part) can be made from ofcut from any carbon fork cut in half lengthwise.

backon2wheels
Posts: 70
Joined: Tue Mar 18, 2008 3:02 am

by backon2wheels

Give the guy any free time at all and parts start getting machined down.

nice effort bro.

Kyle.
agent of Kharma

MikesBike
Posts: 68
Joined: Wed Sep 01, 2004 10:48 am

by MikesBike

Or save time and buy the Thomson Masterpiece :D

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beatnik
Posts: 1237
Joined: Thu Aug 03, 2006 6:38 pm

by beatnik

Or save everything and keep the Elite reliability. You are crazy ;) :lol:
Biomechanical spreadsheet. Sizing&Fitting.

http://weightweenies.starbike.com/forum ... 8e319d185b

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linus
Posts: 494
Joined: Wed Apr 18, 2007 5:18 pm
Location: Toronto, ON

by linus

beatnik wrote:Or save everything and keep the Elite reliability. You are crazy ;) :lol:


Welcome to WW my friend. :wink: :lol:

by Weenie


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