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




Post new topic Reply to topic  [ 12 posts ] 
Author Message
 Post subject: Stem degree help
PostPosted: Mon Aug 31, 2015 2:05 pm 
Offline
User avatar

Joined: Tue Sep 18, 2012 9:17 am
Posts: 121
Guys,

I'm buying a new stem (zipp) and the one it's replacing is a deda, on the deda it says 82 degree, I want the same or slight lower profile for the new one but the ones iv seen online say 17 degree's or 6 degrees, I don't understand why the degrees are so different?

Can anyone help on what I should be buying in the zipp stems?


Last edited by Wonderman on Mon Aug 31, 2015 4:39 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Mon Aug 31, 2015 2:22 pm 
Offline

Joined: Tue May 26, 2015 6:27 am
Posts: 6
82 degrees means -8 degrees. Deda counts from 90 degrees. Other brands call 90 degrees 0 degree.
That means -6 degrees is a more upright position compared to 82 degrees.


Last edited by fEichert on Mon Aug 31, 2015 2:23 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: Stem degree help
Posted: Mon Aug 31, 2015 2:22 pm 


Top
  
 
 Post subject: Re: Stem degree help
PostPosted: Mon Aug 31, 2015 2:23 pm 
Offline

Joined: Tue May 23, 2006 9:39 pm
Posts: 536
i think you subtract 90 degree from the 82 and you get 8 degrees. 6 degrees is typical, like an Enve stem. 17 degree is extreme (up or down depending on how you orient the stem).

_________________
- AX Lightness Vial EVO D + DA9070 + Enve SES 4.5 CK hubs
- Parlee Z5 SLi + DA9070 + Enve 3.4 Tune/Dash hubs
- Parlee ESX + DA9070 + Enve SES 6.7 CK hubs
- Independent Fabrication Ti FLW + Campy SR11 + Enve 3.4 CK hubs


Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Mon Aug 31, 2015 2:23 pm 
Offline

Joined: Sun Aug 03, 2014 1:00 pm
Posts: 45
It depends on how the angle is measured. 82 degrees is "equivalent" to 8 degrees, 17 to 73 and 6 to 84 (they always sum up to 90).


Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Mon Aug 31, 2015 2:26 pm 
Offline
in the industry

Joined: Fri Dec 07, 2012 8:34 pm
Posts: 232
Location: North Carolina
Your Deda is an 82 degree (or 8 degree depending how you look at it), therefore neither of those Zipp stems will be the same angle.
you could get the 6 degree and drop it a few millimeters
find a different 8 degree stem
or just deal with a slightly different position

using basic geometric principals (triangles and sine, cosine, tangent) you can calculate the difference in position between differing stem angles

For Example: assuming a 100mm stem the effective position for each angle is as follows
Reach: (stem length)*cos(angle)
Drop: (stem length)*sin(angle)

6 degree:
Reach: 99.45 mm
Drop: 10.45 mm

8 degree
Reach: 99.03 mm
Drop: 13.92 mm

17 Degree:
Reach: 95.63
Drop: 29.24 mm

This is all relative with assumptions taken into account so don't quote me on these numbers, but its a simple enough method to figure out which stem to get.

_________________
The New: BH http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=117760

The Old: Trek http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=110051


Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Mon Aug 31, 2015 4:16 pm 
Offline
User avatar

Joined: Tue Sep 18, 2012 9:17 am
Posts: 121
Guys thanks so much for the quick and detailed responses,

I'm taking as I want either a 8degree stem for the same position or maybe 9/10 degrees for a slightly lower one.

Cheers again


Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Tue Sep 01, 2015 12:43 am 
Offline

Joined: Fri Oct 30, 2009 10:36 pm
Posts: 363
With a 110mm length stem, every degree of stem angle adds approximately 2mm of handlebar height.

_________________
It's all downhill from here, except for the uphills.


Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Tue Sep 01, 2015 1:19 am 
Offline
User avatar

Joined: Mon Dec 26, 2005 9:21 am
Posts: 152
Location: Canberra, Australia
This might help visualizing the different height/reach of the two stems http://yojimg.net/bike/web_tools/stem.php

Sent from my 0PJA10 using Tapatalk


Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Wed Sep 02, 2015 9:22 pm 
Offline

Joined: Thu Apr 11, 2013 8:21 pm
Posts: 130
kode54 wrote:
i think you subtract 90 degree from the 82 and you get 8 degrees. 6 degrees is typical, like an Enve stem. 17 degree is extreme (up or down depending on how you orient the stem).


I would hardly call 17 degrees extreme. It results in a stem parallel to the ground, which is how nearly all quill stems were made. It's also arguably the most aesthetic.

_________________
My favorite components are the ones I never have to think about.


Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Wed Sep 02, 2015 9:54 pm 
Online
User avatar

Joined: Thu Jul 06, 2006 5:53 pm
Posts: 794
Location: Expat in Washington DC
jpanspac wrote:
kode54 wrote:
i think you subtract 90 degree from the 82 and you get 8 degrees. 6 degrees is typical, like an Enve stem. 17 degree is extreme (up or down depending on how you orient the stem).


I would hardly call 17 degrees extreme. It results in a stem parallel to the ground, which is how nearly all quill stems were made. It's also arguably the most aesthetic.



Only if the head angle is 73 deg......


Top
 Profile  
 
 Post subject: Re: Stem degree help
PostPosted: Wed Sep 02, 2015 10:00 pm 
Offline

Joined: Sat May 02, 2015 10:11 pm
Posts: 237
^But isn't the head angle always between 72 and 74 deg on road bikes?


Top
 Profile  
 
 Post subject: Re: Stem degree help
Posted: Wed Sep 02, 2015 10:00 pm 


Top
  
 
 Post subject: Re: Stem degree help
PostPosted: Wed Sep 02, 2015 10:41 pm 
Online
User avatar

Joined: Thu Jul 06, 2006 5:53 pm
Posts: 794
Location: Expat in Washington DC
Multebear wrote:
^But isn't the head angle always between 72 and 74 deg on road bikes?



Just being a pedant..... If you have ahead angle of 72 and use a -17 deg stem you will have a stem angle of 1 deg, thus it will not be parallel with a level top tube.....probably nobody will notice 1 deg....


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 


Who is online

Users browsing this forum: Bing [Bot], Exabot [Bot], kavitator, Raineman 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. Zipp +/-25 degree stem

in Road

marsbe

1

337

Mon Jun 29, 2015 12:59 am

hasbeen View the latest post

There are no new unread posts for this topic. Looking for a budget lightweight -17 degree stem

[ Go to page: 1, 2 ]

in Road

KarlC

20

1787

Wed May 06, 2015 6:44 pm

KarlC View the latest post

There are no new unread posts for this topic. ISO Ti Stem Bolts for PRO VIBE AL Stem

in Road

salesguy

3

247

Fri Nov 13, 2015 9:42 pm

salesguy View the latest post

There are no new unread posts for this topic. Overdrive stem

in Road

tynnogherlig

10

1009

Thu Mar 26, 2015 3:29 am

Cheetahmk7 View the latest post

There are no new unread posts for this topic. Stem angles?

in Road

PLuKE

9

759

Wed Jul 01, 2015 1:20 pm

PLuKE View the latest post


It is currently Sat Feb 06, 2016 9:02 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