Let Mr. Whirly tag along on your next ride. This versatile crankset comes with everything you need to install it on your fat bike (like a Pugsley) including a 100mm bottom bracket spindle. Once out cruising around, you'll dig the smooth bottom bracket bearings, tough chromoly spindle and stiff 7075 aluminum arms. And, versatile bugger that he is, the Mr. Whirly can be set up in many different configurations to fit on almost any two-wheeled steed (additional parts sold separately).
Image of Singlespeed crank shown (image of 3-speed version unavailable from manufacturer).