I'm new to disc brakes and today I tried to fit a Magura MT Trail Series 2-piston brake to my Bike Friday Pocket Llama frame. However, although I'd be able to attach the caliper to the frame, it does not seem to fit perfectly.

Do I need an adapter or a different caliper, or can I just mount the brake on the frame even though it is not a perfect fit?

enter image description here enter image description here enter image description here

Do I need the Magura QM 12 adaptor to change from the IS mounting standard to the Postmount standard?


1 Answer 1


It seems that spacers on both sides will do the job. I hope this is a good and stable approach and a correct way to mount the caliper.

enter image description here

  • 1
    Does your rotor align correctly with the pads?
    – Paul H
    Commented Jan 29 at 7:37
  • I'll have to check and report back.
    – Stücke
    Commented Jan 29 at 12:10
  • 1
    How did it go, were spacers a feasible fix?
    – DoNuT
    Commented Feb 27 at 17:08
  • Sorry for not getting back to you. Yes, it works well :)
    – Stücke
    Commented Feb 28 at 7:20
  • No worries, it just adds some value to such questions when there is closure, so you may also check this as self-answer. Did you just go by eye/feel or is there any information about the spacers and size? Just wondering how this ties in with mounting "standards" - I think most post-mount calipers usually screw in from one side?
    – DoNuT
    Commented Feb 28 at 7:34

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.