The Surly Pugsley Fork. The fork that pioneered a fat bike revolution is available in offset, symmetrical, and 100mm-spaced versions. Just plain sweet.
100% 4130 chromoly construction; tire clearance up to 4.0" on 82mm rims
Wheel removal can be difficult on 100mm spaced forks
Newly redesigned for increased strength and stiffness
135mm spaced forks require the use of rear hubs or specialty front hubs
Offset forks take rear brake calipers and adaptors
Offset forks have a straight blade that creates a 17.5mm offset which matches the Pugsley frame; this allows front/rear wheel interchangeability