THM Fibula just broke.

Discuss light weight issues concerning road bikes & parts.
KCookie
Posts: 852
Joined: Thu Feb 12, 2015 9:40 am
Location: Pom living in Australia

by KCookie

Hi Guys.
Please can anyone tell me what the part is thats broken on my brake. I'm thinking tension bar. Can it be replaced. Ive looked on the THM instruction manual but it doesn't say.
Gutted as i was getting the bike ready to ride to stage 1 of the TDU tomorrow.
Cheers

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Last edited by KCookie on Mon Jan 15, 2018 8:45 am, edited 1 time in total.

alcatraz
Posts: 587
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

How did it happen? During a ride?

Have you tried popping it back in?

I have a similar looking spring on my brakes and the spring is not attached at the end points because they need to "float" on the spring. It should (afaik) only be attached at the middle.

Judging from the scratch marks in your picture it looks like it's been moving sideways. I would try to center it and see if the clamp has some way of tightening at the middle of the spring.

(I don't have fibulas, just my quick assessment from looking at the pic.)

/a

by Weenie


KCookie
Posts: 852
Joined: Thu Feb 12, 2015 9:40 am
Location: Pom living in Australia

by KCookie

No not on a ride luckily. Just noticed it was frayed while cleaning them.
I have before pushed it back in, i reckon to much centering and to much pressure has damaged it.
Now it has snapped off.
Now thinking can i ride without a front brake, really want to ride to the TDU tomorrow and not on the spare bike.ImageImage

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Squashednuts
Posts: 250
Joined: Tue Apr 25, 2017 11:12 am
Location: Christchurch New Zealand

by Squashednuts

KCookie wrote:
Mon Jan 15, 2018 9:07 am

Now thinking can i ride without a front brake
Admire your determination...if not your sense of self preservation :wink:

Should be a nice day in Adelaide, a balmy 31degrees :thumbup:

KCookie
Posts: 852
Joined: Thu Feb 12, 2015 9:40 am
Location: Pom living in Australia

by KCookie

Yeah the forecast just said 33c. Warming up later in the week.
So your saying it's not a good idea to ride without a front brake. Lol.

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sedluk
Posts: 409
Joined: Mon Sep 07, 2009 3:10 am

by sedluk

The carbon springs can break, they can break if you take your wheel off and the brake is closed. I always put foam in the brake to keep that from happening when I have the wheel off and boxing the bike up for traveling.

The carbon springs can be ordered and replaced pretty easily.

KCookie
Posts: 852
Joined: Thu Feb 12, 2015 9:40 am
Location: Pom living in Australia

by KCookie

I'll email THM later and order a few. Last time they sent me a part for free quite quickly. Now I know the proper name that will help. Appreciated.
Cheers

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Jenmoss
Posts: 97
Joined: Wed Oct 25, 2017 10:15 am

by Jenmoss

Can you use the spring from your rear brake on the front?
This may sound a bit odd but it’s just a piece of material that tensions, you could take the broken piece to a diy store etc and see if you can find something that will work until your replacement comes. I’m sure you could find something. Piece of coat hanger etc . Long as it’s stiff and flexible and fits it will work .

joejack951
Posts: 282
Joined: Fri Feb 18, 2005 6:50 pm
Location: Wilmington, DE

by joejack951

Why not swap in a serviceable front brake (either a spare or from your other bike) to get the bike back on the road? Let's you ride the 'good' bike still just slightly heavier.

KCookie
Posts: 852
Joined: Thu Feb 12, 2015 9:40 am
Location: Pom living in Australia

by KCookie

Yeah i took the Ultegra brake of my spare bike and fitted that.
Good idea on using another material. Coat hanger might actually work.
I really don't know how to get the broken carbon spring out. Can't see how to release it. If someone could tell me how i would be most grateful.

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joejack951
Posts: 282
Joined: Fri Feb 18, 2005 6:50 pm
Location: Wilmington, DE

by joejack951

KCookie wrote:
Mon Jan 15, 2018 1:44 pm
Good idea on using another material. Coat hanger might actually work.
If you are going to fit some other spring, please do not actually use a coat hanger. That steel is nowhere near spring temper and it will, at best, quickly deform and provide no benefit, or worse, fail and puncture a tire or something. Find some proper spring-tempered wire in stainless and use that if want to ditch the carbon spring.

Marin
Posts: 2580
Joined: Wed Jan 22, 2014 11:48 am
Location: Vienna Austria

by Marin

Use a spoke.

kode54
Posts: 1102
Joined: Tue May 23, 2006 9:39 pm

by kode54

its called a return spring.

on one of my eeBrakes (the older version), i had one come off and i was dragging my brakes on a century ride last year.
that's what Cane Creek called it.
- AX Lightness Vial EVO D + DA9150 + Enve SES 3.4 carbon hubs
- Parlee Altum + DA9150 + Enve SES 4.5 carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 6.7 CK hubs
- Independent Fabrication Ti FLW + DA9100 + Enve 3.4 CK hubs

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jekyll man
Posts: 1307
Joined: Wed Apr 25, 2007 10:23 am
Location: Pack filler

by jekyll man

Remembering the shoddy build up problems you had with the bike, its probably been caused by poor or repeated centring of the brake.
Official cafe stop tester

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dgasmd
Posts: 1246
Joined: Sun Apr 15, 2007 5:10 am
Location: South Florida

by dgasmd

I hate to be the one telling you this as I am one that can't really speak, but......... You bought boutique US$1100+ pair of carbon fiber brakes and a little piece broke off. Please, no coat hanger or any other ghetto repairs. Call THM and get the replacement part. It will time to get to you and you will have to do a bit of work to get it to work, but in the end you end up with what you paid for. Sucks that it happened right before a ride where you wanted to parade your abby, but it is what it is.......

Best of luck bud!! :beerchug:

PS: document with pict the replacement process. You are not the first nor will be the last to have this happen to. Nice to see it done!!

by Weenie


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