Anyone tried Tune GumGum?

Discuss light weight issues concerning road bikes & parts.
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Taz
Posts: 784
Joined: Thu Sep 15, 2005 10:19 am
Location: Greece

by Taz

Has anyone tried the new TUNE GumGUM and the carbon ahead cap?
It is a very light headset expander (9 gr for the expander and 5gr for the cap incl. bolt). (So I am looking at a weight saving of 23gr)
Will it support sufficiently the walls of a carbon steerer?
Would the schmolke carbon ahead cap be a better idea?

by Weenie


Centurion
Posts: 20
Joined: Sat Sep 23, 2006 1:10 pm
Location: Heidelberg, Germany

by Centurion

The Smolke ahead cap would definitely be the better choice. When you torque the stem the expander has no function anymore – you just need it once setting up the bearing clearance. You can remove and replace it by the ahead cap which comes in at 5 g for € 24.

Greyhound
Posts: 109
Joined: Tue Jun 22, 2004 9:56 am
Location: Germany

by Greyhound

I use it in combination with a easton ec90 and it works quite fine but i had to reduce the diameter of the gum to make it fit.

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pk0r
AKA "The Nils"!
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Joined: Mon May 31, 2004 11:01 pm
Location: Germany
Contact:

by pk0r

Regards the Schmolke Ahead-Deckel: although it is said that an expander would only be needed to initially adjust the headset play and would then render useless I have made a little difference experience.
With a flexy steerer (THM Scapula SP) my headset came loose after every hard ride over rough surface - once I installed a tiny expander & ahead cap with alloy bolt (so definitely nothing to take high loads) everything was fine and I have been able to ride for 1000s of miles without having to readjust the headset only once. So to me the combination expander + ahead cap is much more convenient than the Ahead-Deckel, especially as it keeps you from being stranded in the middle of nowhere without being able to do any adjustments.

As for the Tune Gum Gum: the real weight really comes down to 9g. In combination with Tune's Carbon-Cap and alloy bolt (5g) you are looking into a weight of 14g vs. 5g of a Schmolke Ahead-Deckel.
Attachments
Schmolke Carbon Ahead Deckel (5g).jpg
Tune Carbon-Cap - 6 - weight (5g incl. bolt).jpg
Tune Carbon-Cap - 4 - cap & alu bolt.jpg
Tune Gum Gum - 5 - weight (9g).jpg
Tune Gum Gum - 4 - unpacked.jpg
Tune Gum Gum - 3 - package rear.jpg
Tune Gum Gum - 2 - package front.jpg
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Taz
Posts: 784
Joined: Thu Sep 15, 2005 10:19 am
Location: Greece

by Taz

pk0r wrote:As for the Tune Gum Gum: the real weight really comes down to 9g. In combination with Tune's Carbon-Cap and alloy bolt (5g) you are looking into a weight of 14g vs. 5g of a Schmolke Ahead-Deckel.


I know, it was your post at FWB forum that I took the actual weights from. :lol:

Carbonman
Posts: 321
Joined: Mon Oct 04, 2004 10:10 am
Location: London (then Tokyo, now Singapore)

by Carbonman

Anyone know were to buy these ? Look on the Tune web site but nothing. Why is it that Tune has loads of great stuff that never makes it to the web site ? Madness.

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slobodaj
Posts: 55
Joined: Mon May 12, 2003 11:21 am
Location: Slovak rep.

by slobodaj

Halo,
This specifications i found by website
Wieder ein neues Teil aus Britzingen: GumGum, eine schonende Klemmvorrichtung aus Silikongummi. Für Steuerrohr- Innendurchmesser von 24 bis 25,5 mm geeignet, insbesondere empfindlicher Carbongabelschäfte. Die Klemmung selbst besteht aus einem sogenannten NBR-Ring (schwarz), einem Trennplättchen, dem eigentlichen Silikonring und einer Gewindeplatte. Gesamtgewicht ganze 7 Gramm! Der empfohlene Verkaufspreis liegt bei 12 Euro.

Beim Justieren des Steuersatzes drückt sich das Silikongummi zusammen und wird dadurch an den Gabelschaft gepresst, bei Umbaumaßnahmen wiederum ist die Klemmung ganz leicht zu entfernen.
Die Klemmvorrichtung ist seit dieser Woche (KW43) lieferbar und wird ab sofort den aktuellen Tune- Steuersätzen Bubu und Bobo beigelegt.

http://www.leichtbau-konfigurator.de/we ... p?tag=tune
Attachments
gumgum_21.jpg
gumgum_11.jpg

User avatar
Taz
Posts: 784
Joined: Thu Sep 15, 2005 10:19 am
Location: Greece

by Taz

Carbonman wrote:Anyone know were to buy these ? Look on the Tune web site but nothing. Why is it that Tune has loads of great stuff that never makes it to the web site ? Madness.


http://www2.hibike.com/main.php?session ... groupID=23

and for the cap:

http://www2.hibike.com/main.php?session ... groupID=22

geraintnorman
Posts: 965
Joined: Sun Oct 16, 2005 8:46 pm
Location: Swansea, Wales, United Kingdom

by geraintnorman

pk0r, thanks for a very informative post!

geraintnorman
Posts: 965
Joined: Sun Oct 16, 2005 8:46 pm
Location: Swansea, Wales, United Kingdom

by geraintnorman

Taz wrote:Has anyone tried the new TUNE GumGUM and the carbon ahead cap?
It is a very light headset expander (9 gr for the expander and 5gr for the cap incl. bolt). (So I am looking at a weight saving of 23gr)
Will it support sufficiently the walls of a carbon steerer?
Would the schmolke carbon ahead cap be a better idea?


Just installed the Tune Gum Gum and Head Cap. Easy to install, looks great and appears to work. It won't get a proper work out until March though! I'll hang on to my USE expander for now...

Strong Bad
Posts: 313
Joined: Sat Oct 21, 2006 4:54 am
Location: Utah

by Strong Bad

These are pretty good also.
TOKEN ULTRA Lite Fork Expander (18 grams)
$12.95 eBay Buy it now price:
Image

geraintnorman
Posts: 965
Joined: Sun Oct 16, 2005 8:46 pm
Location: Swansea, Wales, United Kingdom

by geraintnorman

Strong Bad wrote:These are pretty good also.
TOKEN ULTRA Lite Fork Expander (18 grams)
$12.95 eBay Buy it now price:
Image


Tried it, couldn't get it to work.

Rascal
Posts: 268
Joined: Fri Sep 15, 2006 9:20 pm
Location: California, USA

by Rascal

Have you considered the Extralite Ultrastar. I've had good results.

Have a look at this post: http://weightweenies.starbike.com/forum ... highlight=

Good luck.
"You can't get there from here"

scott97
Posts: 275
Joined: Sun Jun 11, 2006 9:01 pm

by scott97

geraintnorman wrote:
Strong Bad wrote:These are pretty good also.
TOKEN ULTRA Lite Fork Expander (18 grams)
$12.95 eBay Buy it now price:
Image


Tried it, couldn't get it to work.


Ditto.

I ended up using the Extralite Ultrastar.

by Weenie


Strong Bad
Posts: 313
Joined: Sat Oct 21, 2006 4:54 am
Location: Utah

by Strong Bad

Tried it, couldn't get it to work.


Strange, worked with no problem for me.

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