Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About
It is currently Mon Jul 25, 2016 1:08 pm
Recently the board software has been updated and there are some known bugs/failures:
- Avatars are currently not being displayed ✔ FIXED
- Tapatalk connection is currently broken ✔ FIXED
- Avatars cannot be uploaded ✔ FIXED

Please note that we will soon do some changes in WW board template design in case to get a fully mobile/desktop responsiveness board!
If you find more errors please post it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=7&t=139062


All times are UTC+01:00





Post new topic  Reply to topic  [ 14 posts ] 
Author Message
PostPosted: Wed Jun 06, 2012 2:12 am 
Offline

Joined: Sat Jul 19, 2008 8:14 pm
Posts: 172
hi, is it worth it to buy an extralite ultrastar and tune top cap or something similar to reduce weight on the bike, I have a super six evo, already pretty light, but the fsa expander kit is pretty heavy, we can save about 40g with the ultrastar, but 42$ (ultrastar) + 20$ (tune cap) + shipping, maybe I can save elsewhere for less or for the same price. but elsewhere, not sure if we can save 40g for just 80$. i've already ti skewers... 45g

what do you think?

thanks

_________________
Ninja


Top
   
PostPosted: Wed Jun 06, 2012 2:24 am 
Offline
User avatar

Joined: Sat Jan 03, 2009 9:43 pm
Posts: 3036
Location: Canada
My black alloy top cap and bolt from torontocycles is pretty light, actually I think its the same weight as my tune cap and bolt.

The extralite is a great piece of stock but not sure where you can get it at a lower price or better shipping fees.


Top
   
PostPosted: Wed Jun 06, 2012 3:40 am 
Offline
User avatar

Joined: Sun Jun 12, 2005 10:56 am
Posts: 2673
Location: New Zealand
Top cap by MT zoom (check ebay) at about 4.5g incl bolt. Make your own gumgum using a urethane ring and 2 alu washers and a brake mount alu female nut.....$25 should see it all done.

_________________
Updated: Racing again! Thought this was unlikely! Eventually, I may even have a decent race!
Edit: 2015: darn near won the best South Island series (got second in age
-group)..woo hoo Racy Theremery is back!!


Top
   
PostPosted: Wed Jun 06, 2012 3:40 am 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8290
Location: Los Angeles / Glendale, California
EVERY AREA YOU CAN SAVE WEIGHT IS ALWAYS WORTH IT. :twisted:

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Wed Jun 06, 2012 4:15 am 
Offline

Joined: Fri Feb 12, 2010 4:26 am
Posts: 629
I've been very happy with the combo you described. Found it on eBay for $50 and saved 40g over the cannondale expander


Top
   
PostPosted: Wed Jun 06, 2012 5:49 am 
Offline

Joined: Mon Apr 19, 2010 9:44 pm
Posts: 72
Hi ! Can you give me more details on which materials you bought on ebay to make your gumgum ? I am in the process of building up my Evo as well and am looking at alternatives to the SI compression plug. Thank you !


Top
   
PostPosted: Wed Jun 06, 2012 6:46 am 
Offline

Joined: Mon Apr 09, 2012 10:48 pm
Posts: 106
ninjanoir78 wrote:
hi, is it worth it to buy an extralite ultrastar and tune top cap or something similar to reduce weight on the bike, I have a super six evo, already pretty light, but the fsa expander kit is pretty heavy, we can save about 40g with the ultrastar, but 42$ (ultrastar) + 20$ (tune cap) + shipping, maybe I can save elsewhere for less or for the same price. but elsewhere, not sure if we can save 40g for just 80$. i've already ti skewers... 45g

what do you think?

thanks



Bought a gum gum expander and one of the fairwheel top caps today. It totals $30 and weighs 15g for the set...much better than the 45g Neco and FSA I currently have to choose from.

If you're thinking about the gum gum might want to order quick...I just got an email that it came in stock today but it also might not sell out that fast either...haven't been looking long enough to know anything other than it was sold out last week when I wanted to buy it.


Top
   
PostPosted: Wed Jun 06, 2012 10:05 am 
Offline
User avatar

Joined: Sat Dec 06, 2008 10:14 am
Posts: 1037
Location: Sweden
It's likely worth mentioning that the gum-gum gives carbon steerers NO support from being slightly crushed by the stem, and as the stem and the expander doesn't push against one another, it's a common problem that the stem starts creeping upwards, loosening the headset. Some mashed up rubber rng is doing nothing to hold the stem down, which a metal expander does.

Gum-gum works for some, but it is a well known problem and many have tried and given up on it. Do a search.

_________________

The Shivenge


Top
   
PostPosted: Wed Jun 06, 2012 2:04 pm 
Offline
Shop Owner

Joined: Thu Apr 17, 2008 1:07 am
Posts: 997
Location: San Juan, Puerto Rico
The Tune Gum Gum is the minimalist version of an expander and takes a bit of work to get it right the first time but you do same some grams for little $$$$......a solid alloy expander does provide a bit more support on the steering tube but at 4-5 Nm on the stem bolts the Tune does provide some support. If you do experience some tappering of the fork with a Tune Gum-Gum, Extralite or Schmolke cap then I would question the fork quality. We have the Gum Gum on stock and have used it on various builds without any fork problems so far.

_________________
www.royalbicycles.com


Top
   
PostPosted: Wed Jun 06, 2012 3:47 pm 
Offline

Joined: Tue Sep 20, 2011 8:15 pm
Posts: 177
Ultrastar - 7 grams.
Parts of Passion top cap - .7 grams.
Schmolke Carbon bolt - .7 grams.

Total weight is under 9g for the WHOLE setup.

Not the best grams-per-dollar weight savings, because it cost about 80 bucks... but the UD carbon cap and bolt match my raw UD carbon stem really nice, and the Ultrastar works perfect.


Top
   
PostPosted: Wed Jun 06, 2012 4:11 pm 
Offline

Joined: Mon Apr 09, 2012 10:48 pm
Posts: 106
DMF wrote:
It's likely worth mentioning that the gum-gum gives carbon steerers NO support from being slightly crushed by the stem, and as the stem and the expander doesn't push against one another, it's a common problem that the stem starts creeping upwards, loosening the headset. Some mashed up rubber rng is doing nothing to hold the stem down, which a metal expander does.

Gum-gum works for some, but it is a well known problem and many have tried and given up on it. Do a search.


haven't heard that before. Are you saying that the top cap ends up pulling the gum gum expander up instead of the gum gum pulling it down?

If that's the case, it sounds like problem would be improperly installing the gum gum to torque specs (not enough torque) or even just not enough friction inside the tube (hairspray trick or some carbon paste would fix that).

Regardless, I'll start looking into it as I'm interested to see what the problem is that others run into. I might also "jimmy-rig" an aluminum shim to use with the gum gum to try and better emulate a more traditional expander when it does come.


Top
   
PostPosted: Wed Jun 06, 2012 4:26 pm 
Offline
Shop Owner

Joined: Thu Apr 17, 2008 1:07 am
Posts: 997
Location: San Juan, Puerto Rico
I think he is presenting two problems with the Gum Gum:

1. The Stem compressing the steerer tube
2. The gum Gum pulling out as it doesn't hold

The first problem is a first for me....never heard of a stem actually crushing/compresing the steerer tube when installed correctly. As I mentioned I would question the quality of any fork that has problems with 4-5 Nm applied on the steerer tube.....the rider weight puts much more force into a steerer tube than that.

The second problem is a bag of mix results.....on some forks the Gum Gum works from the start and on some you do have to play around....and on some cases it just doesn't work. It could be inside diameter of the fork and surface finish...besides incorrect setup.

Keep in mind that a top cap expander function is just to eliminate the front end play so minimal torque should be enough to make any expander work. Once you have setup your stem with the required torque you could actually take it out (not that I recommend that anyway)

_________________
www.royalbicycles.com


Top
   
PostPosted: Wed Jun 06, 2012 4:30 pm 
Offline
User avatar

Joined: Sat Dec 06, 2008 10:14 am
Posts: 1037
Location: Sweden
No, I'm saying that the gum-gum does nothing to actually hold the headset together, it's about as useful as having no topcap at all. It's perfectly fine for preloading the headset. But after that, it really doesn't do much to keep the stem from creeping upwards on the steerer due to vibrations/bumps when riding.

I know alot of people don't even use topcap, and can't understand or refer to user error when other people can't get it to work and the stem slips upwards, loosening headset preload. It is a much discussed topic, where alot of people aren't having any problems - but then alot of people are, even with everything setup perfectly, using friction paste in stem/steerer interface and whatnot.

Really, this is not a matter of poor setup, but a mechanical issue. Carbon steerers are fairly soft (compared to aluminum ones) and they have a lot of give, that's not a matter of poor quality forks, and with a metal expander there is actually something pushing against the stem just like the stem is pushing against the expander, they somewhat hold each other in place, if you will.

Even here on WW there are lots of threads about people who have binned the gum-gum in favour of the ultrastar, just because of this.


P.S
Oh, and I don't mean actually CRUSHING the steerer so it breaks, but a stem will compress a carbon steerer (ever so slightly) as the material does have some give. Try installing a metal expander, and then the stem. Now remove the expander, the stem bolts will be sligtly looser as the expander expanded the steerer. The stem does the same thing in the other direction. I'm not talking monsterous tourqe on the bolts here either.

_________________

The Shivenge


Top
   
PostPosted: Thu Jun 07, 2012 9:40 am 
Offline
Administrator
User avatar

Joined: Sat Jun 19, 2004 11:08 am
Posts: 6740
Location: Urbana, Illinois
I've never tried a GumGum but have two Ultrastar 2's on two bikes. It works very well. My top cap is a Carbon with bolt that weighs 5 grams. Its been on my Roadbike for over 5 years but the fork, an Alpha Q GS30, has a proprietary starnut in it.

_________________
RESIDENT GRUMPY OLD MAN.


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 14 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Attachment(s) How to install my J&L extra-light headset expander?

in Road

J00P

9

818

Fri Sep 04, 2015 5:58 am

eric01 View the latest post

There are no new unread posts for this topic. No top cap or expander

[ Go to page: 1 2 ]

in Road

jamesbass

15

1327

Thu Oct 08, 2015 5:49 pm

ghisallo2003 View the latest post

There are no new unread posts for this topic. Attachment(s) Out from light holder

[ Go to page: 1 2 ]

in Road

Bely

20

830

Mon Mar 21, 2016 5:17 pm

Calnago View the latest post

There are no new unread posts for this topic. dura ace di2 10 speed red light lit

in Road

hm123

9

564

Tue Oct 27, 2015 9:23 pm

goodboyr View the latest post

There are no new unread posts for this topic. Aircomp Ultra-Light

in Road

TarugoKing

10

382

Sun Jul 24, 2016 9:27 am

e30matt View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: Bing [Bot], Ebruner, MSNbot Media, Yahoo [Bot] and 22 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