Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Wed Jan 17, 2018 7:31 pm

All times are UTC+01:00





Post new topic  Reply to topic  [ 28 posts ]  Go to page 1 2 Next
Author Message
PostPosted: Fri Dec 01, 2017 9:23 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8539
Location: Los Feliz, Los Angeles, California
Hello,

Does anyone know of a resource where I can purchase 17t or other oversized jockey wheels (pulley wheels) individually? I'm looking for carbon fiber or other low-mass options. The one 17t wheel I have in hand is alloy, it could be lighter.
It should be lighter.

No... it must be lighter. :twisted:

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Fri Dec 01, 2017 9:54 pm 
Offline

Joined: Sun Jun 10, 2012 1:11 am
Posts: 1219
Do those actually work as in help with climbing or things like that?


Sent from my iPhone using Tapatalk


Top
   
Posted: Fri Dec 01, 2017 9:54 pm 


Top
   
 
PostPosted: Fri Dec 01, 2017 10:29 pm 
Offline

Joined: Mon Jan 13, 2014 7:26 am
Posts: 272
prendrefeu wrote:
Hello,

Does anyone know of a resource where I can purchase 17t or other oversized jockey wheels (pulley wheels) individually? I'm looking for carbon fiber or other low-mass options. The one 17t wheel I have in hand is alloy, it could be lighter.
It should be lighter.

No... it must be lighter. :twisted:


Try http://berner-bikes.com/
I remember the full cage with pulleys being 78 grams. I think half the weight came from the pulleys. I can measure the pulleys individually this weekend, if you want to be sure...


Top
   
PostPosted: Fri Dec 01, 2017 10:36 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8539
Location: Los Feliz, Los Angeles, California
The larger jockey wheels do help with efficiency. It's the basic principles of a pulley...
"our own" Dan Connel wrote a great article about the efficiency:
http://djconnel.blogspot.com/2010/08/be ... grade.html

http://www.bikeradar.com/us/gear/articl ... ent-37615/

The full cage I have on hand is a 17/12 and weighs 61g... but the wheels are both alloy.

Does anyone know if DarkAlbert is still in business?

I may end up just making my own and 3d printing them in carbonfiber.

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Fri Dec 01, 2017 10:55 pm 
Offline
User avatar

Joined: Mon Jul 07, 2014 8:15 am
Posts: 1748
Location: NorthEU
http://www.rideabikes.com/2016/pro_road ... wheel.html

https://www.ultimateceramicbearings.co. ... duct_id=50

_________________
Bikes:

Ax Lightness Vial EVO D
Paduano Racing Fidia
Open *UP*
https://opencycle.com/showcase/the-xplo ... eelsonfire


Top
   
PostPosted: Fri Dec 01, 2017 11:30 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8539
Location: Los Feliz, Los Angeles, California
Yes, thanks, that's not what I'm asking for. :)

I'm asking for the jockey wheels only. I'm not asking for the cage. As I wrote above, I already have one, and it's 61g complete. Not as light as the one you've just sent however, but slightly lower priced (and for SRAM).

I'd like to reduce the weight by going with a lighter-weight 17t wheel. I already have a carbon 12t wheel for the upper.

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Fri Dec 01, 2017 11:56 pm 
Offline
User avatar

Joined: Thu Mar 24, 2011 6:06 pm
Posts: 940
Fiber lyte says they can make 15t without extra cost from their standard ones, if you don't mind 2 less teeth, fwiw.

(side question - do you think my Wifli mid cage can use 15t/17t without any problems?)

Sent from my SM-G930F using Tapatalk

_________________
Trek Mad-one 7 Series team colours http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=115500&start=15

Fuji SL 1.1 http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=140134&hilit=Fuji


Top
   
PostPosted: Sat Dec 02, 2017 12:05 am 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8539
Location: Los Feliz, Los Angeles, California
Good side question! I'll measure the length of my cage when I get home and we can compare. It's going on a tuned derailleur that originally had a short-cage on it.

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Sat Dec 02, 2017 12:50 am 
Offline

Joined: Sun Jun 10, 2012 1:11 am
Posts: 1219
Wait what? You can print in carbon fiber now? That would be so awesome if you printed your own.


Sent from my iPhone using Tapatalk


Top
   
PostPosted: Sat Dec 02, 2017 1:21 am 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8539
Location: Los Feliz, Los Angeles, California
You can print in CF, but there are two issues:
there's a 4mm minimum wall thickness if you want a continual CF strand laid in by the printer. This is good for strength, but takes finessing on the print side to make sure the printer will lay it in the way you want it... and it is just one thin strand.
-Everything else is basically a resin mix + finely chopped CF mixed in, which does not do much for overall tension strength because the CF fibers are not continuous, just sort of 'random' but really dense.

The end result are parts that are 'strong' and 'stiff' in compression, better than comparables in tension (but not amazing), and not as light in weight as a hand-laid cf piece, but lighter than alloy.

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Tue Dec 05, 2017 7:39 am 
Offline

Joined: Sun Jun 10, 2012 1:11 am
Posts: 1219
prendrefeu: that's awesome. always learning new things from you! :) i have an old RED 10sp short cage and a Red Wifli... so if i wanna get larger pulley.. how would i go about in know which one to get?


Top
   
PostPosted: Mon Dec 25, 2017 12:10 am 
Offline
User avatar

Joined: Thu Mar 24, 2011 6:06 pm
Posts: 940
prendrefeu wrote:
Good side question! I'll measure the length of my cage when I get home and we can compare. It's going on a tuned derailleur that originally had a short-cage on it.
Suddenly reminded of this - any help @prendrefeu?

Sent from my SM-G930F using Tapatalk


_________________
Trek Mad-one 7 Series team colours http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=115500&start=15

Fuji SL 1.1 http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=140134&hilit=Fuji


Top
   
PostPosted: Mon Dec 25, 2017 4:02 am 
Offline

Joined: Fri May 08, 2009 8:31 pm
Posts: 315
Location: Denver
Prendrefeu, your post piqued my curiosity, and I found a set of hollow printed titanium jockey wheels on line from CeramicSpeed for the bargain price of (for real!!) $1000. I wonder if they have actually sold any:) That's a weight reduction costing about $500/gram!
On that rideabikes site, if you click on the "integrating components" tab, scroll down about half way, and you can find jockey wheels without the cage-item code PXLY. No price, weight, or ordering information, however.


Top
   
PostPosted: Tue Dec 26, 2017 2:04 pm 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8539
Location: Los Feliz, Los Angeles, California
Kayrehn wrote:
prendrefeu wrote:
Good side question! I'll measure the length of my cage when I get home and we can compare. It's going on a tuned derailleur that originally had a short-cage on it.
Suddenly reminded of this - any help @prendrefeu?

Thanks for the reminder! (and I just returned from a short holiday, sorry for the delay)

I measured 82.26mm from center of the top wheel (which is also the center of the axle) to the center of the lower wheel. The "oversized" cage I have runs a 17t lower, 12t upper.

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Tue Dec 26, 2017 4:13 pm 
Offline
User avatar

Joined: Sat Aug 30, 2008 1:46 pm
Posts: 107
Location: Ariege, Midi-Pyrenees
[/quote]

I measured 82.26mm from center of the top wheel (which is also the center of the axle) to the center of the lower wheel. The "oversized" cage I have runs a 17t lower, 12t upper.
[/quote]


Hi, can you say what brand and model your oversized cage is? Thanks.


Top
   
Posted: Tue Dec 26, 2017 4:13 pm 


Top
   
 
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 28 posts ]  Go to page 1 2 Next

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Upgraded jockey wheels on DA 9100R rear derailleur

in Road

tantra

3

682

Fri Aug 11, 2017 2:18 am

Pokerface07 View the latest post

There are no new unread posts for this topic. Could you get away with a cog/derailleur pulley this tight? [PIC]

in Road

Shrike

7

974

Fri May 12, 2017 1:48 pm

bikerjulio View the latest post

There are no new unread posts for this topic. Dura ace 9000 rear derailleur?

in Road

sinjun

2

758

Mon Apr 10, 2017 6:02 am

richscott View the latest post

There are no new unread posts for this topic. Campagnolo Chorus HO Rear Derailleur

in Road

stormur

8

969

Mon Aug 07, 2017 11:30 pm

ultimobici View the latest post

There are no new unread posts for this topic. Sram red rear derailleur issues

[ Go to page: 1 2 ]

in Road

NiFTY

19

2331

Tue May 09, 2017 11:32 pm

Gearjunkie View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: bikeguy0, Christono, darnellrm, faucon, jch3n and 35 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:  
Powered by phpBB® Forum Software © phpBB Limited