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




Post new topic Reply to topic  [ 19 posts ] 
Go to page 1, 2  Next
Author Message
PostPosted: Fri Jul 27, 2012 4:25 pm 
Offline

Joined: Mon Jul 31, 2006 6:49 pm
Posts: 427
so I just got a new frame, Cervelo RS and I want to make sure that I dont trim it to much, but do want to leave enough in case I want to come up higher. So do I measure from the headset carbon cone or from the top of the headset. How much do I allow for the spacers, stem, and maybe one small spacer on top. please adive


Top
 Profile  
 
Posted: Fri Jul 27, 2012 4:25 pm 


Top
  
 
PostPosted: Fri Jul 27, 2012 4:50 pm 
Offline

Joined: Mon Oct 12, 2009 6:36 pm
Posts: 246
Assemble the bike without cutting the steerer. Then installed the maximum amount of spacers you think you would need and install the stem. Add 2 mm and cut it there.


Top
 Profile  
 
PostPosted: Fri Jul 27, 2012 5:01 pm 
Offline

Joined: Mon Jul 31, 2006 6:49 pm
Posts: 427
is there a max spacers that can be put below the stem?


Top
 Profile  
 
PostPosted: Fri Jul 27, 2012 5:14 pm 
Offline

Joined: Sat Jul 29, 2006 2:36 am
Posts: 1156
Location: UK
Manufacturer specific. Check the docs that came with your frame.


Top
 Profile  
 
PostPosted: Sat Jul 28, 2012 4:25 am 
Offline

Joined: Sun Jul 10, 2011 9:03 am
Posts: 292
daj wrote:
Assemble the bike without cutting the steerer. Then installed the maximum amount of spacers you think you would need and install the stem. Add 2 mm and cut it there.


Shouldn't that be 'subtract 2 mm'?

_________________
r o y g b i v


Top
 Profile  
 
PostPosted: Sat Jul 28, 2012 5:36 am 
Offline
User avatar

Joined: Tue Mar 08, 2005 10:01 pm
Posts: 662
Location: New Hampshire
Adding 2mm will allow for a 5mm spacer above the stem, which is generally good practice with any carbon-steerer fork.


Top
 Profile  
 
PostPosted: Sat Jul 28, 2012 1:56 pm 
Offline

Joined: Sat May 26, 2012 11:26 pm
Posts: 394
Cannondale recommends cutting 2mm below the top of the stem

_________________
Evo 5.63kg SL3 6.66 viewtopic.php?f=10&t=110579" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;


Top
 Profile  
 
PostPosted: Sat Jul 28, 2012 5:48 pm 
Offline

Joined: Fri May 18, 2012 7:11 pm
Posts: 296
Location: FL
allezkmiec wrote:
Adding 2mm will allow for a 5mm spacer above the stem, which is generally good practice with any carbon-steerer fork.


If it's carbon steerer and using an expander plug then below the stem is usually recommended. You can add a 5mm above but you have to make sure you install the expander plug deep enough.


Although he has a Cervelo RS and there are instructions here http://www.cervelo.com/r/3T%20Fork_instruction.pdf It involves more than normal.


Top
 Profile  
 
PostPosted: Sat Jul 28, 2012 7:02 pm 
Offline

Joined: Mon Jul 31, 2006 6:49 pm
Posts: 427
thanks, but I was wondering if there is a limit of how high the stem can be. I been hearing that you can go up from the cone for another 4-5 cm, then stem, then 2-5mm on top. doest that sound right


Top
 Profile  
 
PostPosted: Sat Jul 28, 2012 7:42 pm 
Offline

Joined: Mon Jan 21, 2008 12:09 pm
Posts: 2450
If you're going to add 4 or 5 cm of spacers, you're on the wrong frame.

_________________
TED
Schoorl, Noord-Holland, Nederland
Bike Pics
English Custom Steel Internal di2
Litespeed Ghisallo


Top
 Profile  
 
PostPosted: Sat Jul 28, 2012 11:22 pm 
Offline

Joined: Tue Sep 28, 2010 10:30 pm
Posts: 313
NiFTY wrote:
Cannondale recommends cutting 2mm below the top of the stem


Are you absolutely sure?!?! Cutting 'below' the stem height reduces the effectiveness of the top bolt on the stem as it is not gripping onto the steerer enough. I VERY highly doubt your info is correct.

_________________
It's not how much you spend on a bike it's how hard you can ride it.


Top
 Profile  
 
PostPosted: Sat Jul 28, 2012 11:40 pm 
Offline

Joined: Sat Jul 29, 2006 2:36 am
Posts: 1156
Location: UK
NiFTY is correct. Cannondale specify not to put a spacer above the stem.


Top
 Profile  
 
PostPosted: Sun Jul 29, 2012 12:02 am 
Offline

Joined: Tue Sep 28, 2010 10:30 pm
Posts: 313
That is very surprising to say the least!!

My steerer was cut about 2 or 3 mm lower than the stem and the top of the stem (at the top bolt tabs) closes in when tightening. This does not apply as much grip pressure on the steerer compared to having the steerer protrude past the stem. It reduces the effectiveness of the top bolt and this may not have any negative consequence to your general riding/training/racing but in a max-effort-sprint out of the saddle it would be a little un-nerving.

_________________
It's not how much you spend on a bike it's how hard you can ride it.


Top
 Profile  
 
PostPosted: Sun Jul 29, 2012 12:29 am 
Offline

Joined: Mon Jul 31, 2006 6:49 pm
Posts: 427
I'm sorry if not wording my self correctly, I'm for sure going to have few mm of steer tube past the stem. I I was just wondering what is the limit of steer tube that I can have before it gets to the stem


Top
 Profile  
 
Posted: Sun Jul 29, 2012 12:29 am 


Top
  
 
PostPosted: Sun Jul 29, 2012 1:55 am 
Offline

Joined: Tue Sep 28, 2010 10:30 pm
Posts: 313
As long as you have even a thin shim (mine is less than a 1mm aluminium shim) between is fine. It's generally accepted that putting stem straight on top is not advisable.

_________________
It's not how much you spend on a bike it's how hard you can ride it.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 19 posts ] 
Go to page 1, 2  Next


Who is online

Users browsing this forum: centhar, customtune, Exabot [Bot], Google Adsense [Bot], mnmasotto, random101, sanrensho and 41 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. headset advice

in Road

KOGAN

1

388

Sun Dec 08, 2013 2:44 am

bricky21 View the latest post

There are no new unread posts for this topic. New headset advice, please

in Road

DMF

7

566

Sun Sep 15, 2013 8:31 pm

DMF View the latest post

There are no new unread posts for this topic. Ui2 battery seatpost advice

in Road

KOGAN

11

1183

Wed Nov 20, 2013 5:33 am

drmutley View the latest post

There are no new unread posts for this topic. Advice need for training bike

in Road

cappo455

14

742

Tue Apr 22, 2014 6:30 pm

NGMN View the latest post

There are no new unread posts for this topic. Size-advice Canyon CF SLX

in Road

bruno2000

4

610

Thu Apr 03, 2014 11:51 am

bruno2000 View the latest post


It is currently Fri Aug 22, 2014 5:36 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