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Mech Hangers Are Expensive

georgebrailsfordgeorgebrailsford Posts: 23
edited March 2013 in MTB general
So mech hangers are a deliberate weak link which protects your frame and your derailleur from being written off if you bash the back around a bit much. Why are they so expensive? And why, if they are deliberately weak, are they not plastic? Assuming plastic ones would be cheaper to replace than alloy or machined ones. I'm asking because i've slid off alot recently due to the roads being covered in lovely loose grit salt and i'm on my 3rd replacement since Christmas, at about a tenner a go it's becoming quite expensive.
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  • quit belly aching. Wish mine had broken today instead of my XTR rear mech...... £140 down the drain! I suggest you need to scan the road better if you're falling off on tarmac!
  • stubsstubs Posts: 5,001
    Fig rolls: proof that god loves cyclists and that she wants us to do another lap
  • well if your mech broke your hanger was too strong....so it should've been cheaper/softer plastic?
  • stubsstubs Posts: 5,001
    The hanger is to protect the frame not the mech.
    Fig rolls: proof that god loves cyclists and that she wants us to do another lap
  • cooldadcooldad Posts: 32,601
    Does your brain hurt a lot?
    It needs to be rigid as well or your indexing will be a bit off, all the time.
    I don't do smileys.

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  • concordeconcorde Posts: 1,008
    cooldad wrote:
    Does your brain hurt a lot?
    It needs to be rigid as well or your indexing will be a bit off, all the time.

    And you can't get rigid plastic?! That's a new one on me!
  • cooldadcooldad Posts: 32,601
    Concorde wrote:
    cooldad wrote:
    Does your brain hurt a lot?
    It needs to be rigid as well or your indexing will be a bit off, all the time.

    And you can't get rigid plastic?! That's a new one on me!
    Read his post again. He said softer plastic. And then you'd need metal inserts to bolt the mech into.
    Keep up.
    I don't do smileys.

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  • cooldadcooldad Posts: 32,601
    But the actual problem seems to be falling off a lot.
    I don't do smileys.

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  • granted that is my problem. but ricardo_smooths problem is that his derailleur broke. Why are the "weak links" not properly weak and cheaper to replace, thus protecting the derailleur and the frame
  • also you'd only need a metal thread insert for the derailleur to attach to
  • cooldadcooldad Posts: 32,601
    Because, as mentioned, it's there to save your frame, not your mech. Steel frames have integral hangers but you can bend steel. Aluminium would snap.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

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  • i know, i just feel it would make more sense to protect both by making them snap-ier. Especially because doing so would probably make them cheaper. I'm not arguing that they shouldn't exist, i understand why they are used and why they're made like they are, I just think that making them differently could result in something better. Whether i'm right or not...... that's just my ha'penny :)
  • Quite simple really. I don't want my mech falling off with every small knock. And be careful.
  • well that would be too weak, the perfect strength would allow it to snap just before the derailleur broke.
  • supersonicsupersonic Posts: 82,708 Lives Here
    It is a balancing act. Stiff enough to withstand the way the mech works and light knocks, weak enough to sacrifice itself and save the frame.

    But I agree, they are stupidly expensive for a small piece of alloy.
  • nicklousenicklouse Posts: 81,520 Lives Here
    stubs wrote:

    why?

    that FUBARs everything.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
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  • chez_m356chez_m356 Posts: 1,893
    at about a tenner a go it's becoming quite expensive.
    be glad your only paying a tenner, it would cost me double that
    Specialized Hardrock Sport Disc 10- CANYON Nerve AM 6 2011
  • PlyphonPlyphon Posts: 433
    I'm thinking about taking my hanger into a mate who has a CNC machine, and asking him to copy it, and quote me for it.

    Just to see if they really do cost pennies.
  • stubsstubs Posts: 5,001
    I think the problem is there are about 200 different designs of hanger out there if the bike manufacturers could agree on say 2 or 3 designs we probably could buy them for about £3 each. I know nothing about CNC machines but I bet the main cost is setting them up for each new design. If it was so easy then the Chinese who can knock out CNC machined LED lights for £10 would be making them and selling them for noodles.
    Fig rolls: proof that god loves cyclists and that she wants us to do another lap
  • DodgeTDodgeT Posts: 2,255
    http://www.muckynutz.com/index.php?rout ... duct_id=61
    I assume it lets you change gear?! If it does, why can't a beefier permanent universal hanger exist?
  • cooldadcooldad Posts: 32,601
    Plyphon wrote:
    I'm thinking about taking my hanger into a mate who has a CNC machine, and asking him to copy it, and quote me for it.

    Just to see if they really do cost pennies.
    Careful making it too strong unless you want to lose your frame - there is a reason they are made of cheesy cast alloy.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • Really don't see the problem, it's the first thing I buy when I get a new bike/frame and then it goes in the Camelback.

    I think that the one for the Summum cost £19 but I don't want a day's DH uplift to be wasted because of a failure.

    Never had to replace one yet, but I know it's there so that I can carry on the ride if needed.
  • RockmonkeySCRockmonkeySC Posts: 15,247
    cooldad wrote:
    Plyphon wrote:
    I'm thinking about taking my hanger into a mate who has a CNC machine, and asking him to copy it, and quote me for it.

    Just to see if they really do cost pennies.
    Careful making it too strong unless you want to lose your frame - there is a reason they are made of cheesy cast alloy.

    It's going to be expensive to make as a one off. For one similar to the mech hanger on my Scalp I would quote around £150 - £175 including the steel thread insert. You also need to get the right grade aluminium, it may not be the same as the frame and it may need heat treatment. I wouldn't bother with it, much easier and cheaper to just buy one.

    Mech hangers can't be designed to fail before the mech because there are so many different mech's which vary massively in strength. If they were designed to suit the weakest good quality mech you would still be bending hangers regularly.
  • welshkevwelshkev Posts: 9,690
    3 hangers and a new mech for me in the last 6 months, quit your whining :wink::lol:
  • ilovedirtilovedirt Posts: 5,798
    You should all be glad you don't ride an intense, £150 for a replacement hanger!
    Production Privee Shan

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  • bennett_346bennett_346 Posts: 5,092
    stubs wrote:
    I think the problem is there are about 200 different designs of hanger out there if the bike manufacturers could agree on say 2 or 3 designs we probably could buy them for about £3 each. I know nothing about CNC machines but I bet the main cost is setting them up for each new design. If it was so easy then the Chinese who can knock out CNC machined LED lights for £10 would be making them and selling them for noodles.
    If it's CNC'd surely there's no cost to changing the design it outputs other than the code monkey who reprogrammes the tooling machine?

    I imagine they are made in one of these or similar, correct me if i'm wrong:

    https://www.youtube.com/watch?v=RNPojGFg9-8
  • RockmonkeySCRockmonkeySC Posts: 15,247
    Not necessarily. Different hangers may be using different cutters and different tooling to hold the hanger during machining. They also need processing separately and packing separately.
    Design is also an expensive process, the component will have to go through design, FEA, detailing, CNC programming and all the document control bollocks.
  • The RookieThe Rookie Posts: 27,748
    Volume saves....always worth seeing if the Carrera one will fit as Halfords do them for £7.99......
  • cooldadcooldad Posts: 32,601
    CRC are selling ones that fit my Kona for £4.99. I've stocked up on a couple.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • supersonicsupersonic Posts: 82,708 Lives Here
    Most are not CNCd, they are forged ie smacked with a big press.
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