Rear mech hangers - all the same?

pbassred
pbassred Posts: 208
edited June 2018 in Workshop
While taking my Boardman CX off roadish managed to drop it on the only piece of concrete in the park. (#irony). So now I need to understand mech hangers. OEM from Halfords is going to take a week but I need the bike earlier. There are many (of the right model) available.

Is there any difference/advantage in CNC machined over the cast ones? The OEM one weighs 10gm

Comments

  • sungod
    sungod Posts: 16,551
    just get a compatible hanger (or two, so that next time you will have a spare ready)
    my bike - faster than god's and twice as shiny
  • pbassred
    pbassred Posts: 208
    Sure, but the question was about CNC versus cast
  • veronese68
    veronese68 Posts: 27,324
    Thing is you don’t want it too strong as it’s the sacrificial part. I doubt there’s a great advantage of one over the other. CNC is cheaper to set up manufacturing for initially but more expensive if you make a lot of them. Casting needs a mould but is cheap to produce. CNC may look fancier and be a fraction lighter. I’d get whichever will get to you quickest and easiest.
  • sungod
    sungod Posts: 16,551
    the only generic benefit of cnc vs. casting is probably tighter possible tolerances, but if casting is good enough, there's no operational advantage

    cnc may be easier/cheaper for manufacture as the same machines can produce many different hangers, whereas casting or forging would require individual moulds/dies

    hangers need to be stiff in normal operation, allow alignment, and fail when forces get too high

    unless you know the specific metallurgy and production process of the 'same' hanger produced using the two methods, there's no way to say if one is 'better' than the other operationally
    my bike - faster than god's and twice as shiny