The Race Blades only work with road tires, like a 23c. There are a couple of wider tire models that will work. I have the Planet Bike EZ's (or something like that) that work just fine with Fangos. I am pretty sure SKS makes a similar model for wider tires.
I run a set of planet bike Freddy's bolt-ons that I mount with zip ties on my Major Jake. Takes about 5 min on or off once you get the hang of it. My fork does not have a hole in the crown so I have to make some adaptations to get the front fender mounted.