Threads brake mounts?

dhutch
dhutch Posts: 343
edited December 2007 in MTB workshop & tech
Hi,

Im working on a project with a school involving a electric powered car tha uses a pair of BMX (20" ?) rear wheels at the back, with the drive being applied though the rear cassette on one wheel, and bracking view diskbrakes on each side.

The problem is the the disk brakes appear to be attached to a coller that its threaded onto the hub of the wheel (aluminum to aluminum) rather than bolted directly on as i am familuar with.
- But whats is that under heavy breaking, the threads between the coller that the disk in mounted to, and the hub of the wheel have been damaged on one wheel (the non driven one)

To this end i am wondering the best options are from here? And if anyone can shead any light on this form of brake attachment?

The cassette also appears to be threaded on, and as the damaged wheel is the non driven one, there has been talk of placing the disk onto the other side of the wheel. However the thread seam to be diffrent, and the coller is a knacked as the wheel and ive not seen any in the shops.
- But then whats to say it wont just strip again?

If there was a way of holding the coller on in a stright possition i would be tempted to just TIG it on. But ive not seen there techition welding ali so that might be a bit grim!! Even if we could get it roughtly stright!


Daniel

Comments

  • nicklouse
    nicklouse Posts: 50,673
    you need some good thread lock. the thread for the disc carrier should be left hand so that it does not undo in normal braking but it could undo in reverse.

    unless it is a flipflop hub where it should not be used unless you, as you say "Tig" it on.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • dhutch
    dhutch Posts: 343
    nicklouse wrote:
    you need some good thread lock. the thread for the disc carrier should be left hand so that it does not undo in normal braking but it could undo in reverse.

    unless it is a flipflop hub where it should not be used unless you, as you say "Tig" it on.
    Yeah, well i presume it was put on the right way round, but im not taking that as read and will check today.
    - However, certainly now it need more than thread lock, and neather parts have really any threads left at all. Yay!

    Flipflip hubs?

    I'll take photos of the setup today.


    Daniel
  • dhutch
    dhutch Posts: 343
    here we go, best ive got, can anyone recognise anything off that as to what it is?


    image013xw8.jpg


    Daniel
  • nicklouse
    nicklouse Posts: 50,673
    BMX hub with threads both sides commonly known as a flip flop hub.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • dhutch
    dhutch Posts: 343
    So what does that mean?
    - Whats the best way to get back to a point where the disk is attached and likly to stay as such?
  • nicklouse
    nicklouse Posts: 50,673
    new hub.

    and lots of thread lock.

    the hub is not designed to work with discs.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • dhutch
    dhutch Posts: 343
    nicklouse wrote:
    new hub.

    and lots of thread lock.

    the hub is not designed to work with discs.

    Right ok, so we cant just turn it round?
    - if we where geting a new hub, we mgiht as well just get a disk compatable one, right?
  • nicklouse
    nicklouse Posts: 50,673
    the treads are not normally the same. some are.

    disc hubs are wider,
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown

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