I run Avid 185mm's on my monkey and its not bad,
just loosen the botls holding the caliper to the frame and pull the wheel out.
Just remember to tighten them up when your done
Like the brakes enough to deal with the extra work.
chris
With the sliding brake mounts, I have mine set where the wheel will go on without loosening the bolts, and it seems to be working fine. I've got plenty of braking power, and easy to work on.