HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Articles FAQ Contact About




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Fri Nov 14, 2014 11:21 am 
Offline

Joined: Sun Apr 21, 2013 2:56 pm
Posts: 24
Location: Bournemouth, UK
Hi
I'm building a retro steel TT bike and for the silver bling look was going to use a Thompson post (undecided on Elite or MP) and given they come in 250 or 330mm lengths I'm unsure which length to go for. I can't find what the minimum insertion is on their site and I'd probably say I need about 90mm in the frame if I use a 250mm post. I've been advised it's a balance also of the frame material too. Frame is Reynolds 753 and I'd prefer the shorter length, but don't want to risk issues...

Thoughts and any help very welcome!

_________________
Losing weight is an education
Hong Fu Bikes FM0069 Superlight 2014 6.35kg (SRAM Red, Ksyrium SLRs)
Cannondale Flash F1 '10
Felt Brougham '10


Top
 Profile  
 
PostPosted: Fri Nov 14, 2014 12:50 pm 
Offline

Joined: Mon Jan 02, 2006 7:10 pm
Posts: 399
Insertion lengths are listed on the website under the 'specs'.

Don't forget you can also buy long and then cut off unnecessary length.


Top
 Profile  
 
Posted: Fri Nov 14, 2014 12:50 pm 


Top
  
 
PostPosted: Fri Nov 14, 2014 2:30 pm 
Offline

Joined: Thu Aug 20, 2009 12:44 pm
Posts: 118
As a very minimum I think the seatpost needs to go past the top tube lug


Top
 Profile  
 
PostPosted: Fri Nov 14, 2014 4:22 pm 
Offline
User avatar

Joined: Wed Oct 06, 2004 6:55 pm
Posts: 2008
Location: Vienna, AUT
As you mention this is a retro steel TT frame, then it might have fastback seat stays, so you should go considerably beyond the seat tube lug.
With my older steel frame I have a minimum insertion of 8 to 10 cm from the top of the seat tube lug. But that might be overkill if you are a lighter rider.


Top
 Profile  
 
PostPosted: Fri Nov 14, 2014 9:18 pm 
Offline

Joined: Wed Feb 03, 2010 1:31 am
Posts: 340
I have a Waterford 2200 frame. Lugged, Reynolds 753, silver brazed. Fastback style seatstays. The seatstays come close to each other at the back of the lug below the bolt. American Classic aluminum seatpost. Old style, original post. 13cm of shaft sticking out of the lug. Assume the post is 25cm total. So about 12cm of post in the seattube. Not sure where the minimum insertion line on the post is. Guessing the minimum line is about 8-10cm from the bottom. So your 9cm inserted in the seattube is right near the minimum insertion line. I would say you will be OK with the 25cm post from Thompson. You'll be right near the minimum insertion line. Few millimeters either way. Doubt it will matter either way. I do not think the Reynolds 753 tubing will care. Mine has held up fine for 17 years.


Top
 Profile  
 
PostPosted: Fri Nov 14, 2014 9:27 pm 
Offline

Joined: Mon Jan 02, 2006 7:10 pm
Posts: 399
In fact, don't worry about it: it will cold weld in no time.


Top
 Profile  
 
PostPosted: Fri Nov 14, 2014 10:55 pm 
Offline

Joined: Sun Apr 21, 2013 2:56 pm
Posts: 24
Location: Bournemouth, UK
Thanks for the replies, I've attached a pic of the lug at the top of the tube. Couldn't find the spec on the site, but think at 90cm should be ok. Im 185lb or 84kg and have been told both the Elite and the Masterpiece are pretty much bomb proof, just need the tubes to hold out. Guessing they will as its not carbon...


Attachments:
LowPro.jpg
LowPro.jpg [ 145.34 KiB | Viewed 702 times ]

_________________
Losing weight is an education
Hong Fu Bikes FM0069 Superlight 2014 6.35kg (SRAM Red, Ksyrium SLRs)
Cannondale Flash F1 '10
Felt Brougham '10
Top
 Profile  
 
PostPosted: Tue Nov 18, 2014 9:45 pm 
Offline

Joined: Wed Mar 19, 2014 3:18 pm
Posts: 152
Just get the long one and cut it down as needed.


Top
 Profile  
 
Posted: Tue Nov 18, 2014 9:45 pm 


Top
  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 


Who is online

Users browsing this forum: bikemaniack, Bing [Bot], Cyberduc748, Exabot [Bot], MSNbot Media and 31 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Need Seat Post Yoke Bolts, Where?

in Road

synthesis

2

410

Sun Jul 27, 2014 6:56 pm

synthesis View the latest post

There are no new unread posts for this topic. Seat post clamp 1-bolt Ritchey

in Road

Method01

2

151

Fri Apr 03, 2015 8:23 pm

Rick View the latest post

There are no new unread posts for this topic. Seat post advice - Boardman AiR road bike (not TT)

in Road

Svetty

3

360

Wed Apr 01, 2015 11:42 am

Svetty View the latest post

There are no new unread posts for this topic. Attachment(s) Cento1SR ISP and Ritchey seat post stubby question

[ Go to page: 1, 2 ]

in Road

Frankie13

21

1137

Mon Dec 08, 2014 10:56 am

Method01 View the latest post

There are no new unread posts for this topic. Post to Post Disc Brake Adapter

in Road

Valbrona

1

118

Wed Apr 15, 2015 4:14 pm

dwaharvey View the latest post


It is currently Thu May 28, 2015 5:22 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB