VITAL MTB has a pretty good tip for riders who want to avoid mechanicals on their dh, freeride and slopestyle whips
from Vital mtb
We've probably all had a wheel eat up a derailleur that goes too far over into the spokes - it literally sucks. This is the last sort of thing I want to ruin a ride or race. To alleviate this potential fun ender, I've been doing the following modification to my bikes over the past few years with great success. I hope this may be able to help some other riders as well.
from Vital mtb