Can you Mount a Front Disc brake sold as IS as Post Mount?

myopic
myopic Posts: 692
edited May 2011 in MTB workshop & tech
It looks as if this should be possible by just missing out the IS adpater and fitting the brake direclty to the PM, but I'm sure there must be a subtle alignment issue that would mean the disc would not align with the calliper. Would it, or is this in fact possible? I should know the answer, but I've only ever fitted IS specc'd brakes to IS forks and likewise for PM, and i'm too knackered to think straight :oops:
You don't need eyes to see, you need vision

Comments

  • supersonic
    supersonic Posts: 82,708
    The mounts are available. But what size rotor? What disc brake and fork too?
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • myopic
    myopic Posts: 692
    IS mount brake is an Elixir R with 160 disc, fork is a Fox Float PM. Haven't got the tow available to try, so I was wondering if you could just chuck away the IS adapter and put it staright on, but like I said, I think (expect) there would be alignmnet issues.
    You don't need eyes to see, you need vision
  • nicklouse
    nicklouse Posts: 50,675
    the brake is Post mount anyway just fit it,
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • myopic
    myopic Posts: 692
    Thanks, Nick, that's what I was wondering! So the only difference with an Avid Elixir R Front Brake sold as IS mount vs one sold as PM is that the IS one comes with an adapter? Chuck that away and the IS mount front brake becomes a PM one?

    It looked like that would be the case, but with them being sold as different I expected there must be some non-obvious alignment issues.
    You don't need eyes to see, you need vision
  • supersonic
    supersonic Posts: 82,708
    Indeed, that is the case! And why I asked what brake you had hehe ;-)

    Bolt straight on tothe mounts for use with a 160mm rotor.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • myopic
    myopic Posts: 692
    Thanks, Guys!

    Out of curiousity, would the same also apply to bigger rotors? I mean if you had a 185 IS brake, then you could still mount that as PM, but you would need to get spacers to move it back?
    You don't need eyes to see, you need vision
  • Fenred
    Fenred Posts: 428
    The mount acts as the spacer...You'll need apropriate length bolts though.
  • myopic
    myopic Posts: 692
    OK, but a 185 PM mount adapter with the approprioate bolts would do the trick?
    You don't need eyes to see, you need vision
  • supersonic
    supersonic Posts: 82,708
    Yep!
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • Fenred
    Fenred Posts: 428
    Yep buy a 185 pm/pm mount and bolt it up....
  • myopic
    myopic Posts: 692
    Phew, just thought it couildn't be that simple. Nice to know for once it is. Now I can sleep without this going round in my head all night!!
    You don't need eyes to see, you need vision

Categories