Originally Posted by Aeroplane
"Normal 135 hubs" meaning your average 135mm freehub, for a multi-gear bike.
Yes, it's probably "even more" of a problem for freeride and like, but my point is that the problem is extremely minute. Unless you are casing every landing and not absorbing anything with your legs at all, you probably won't have to worry about wrecking your wheel.
I thought I was pretty clear that I was talking about 135mm-spaced
freewheel hubs being potentially a problem because of exposed axle. Just a miscommunication, and shugun17 explained the reasons more.
I'm going to just, for now, get a singlespeed conversion kit and run one or two sprockets on the freehub, along with spacers.