Let Mr. Whirly tag along on your next ride. This versatile crankset comes with everything you need to install it on your bike. Once out cruising around, you'll dig the smooth bottom bracket bearings, tough chromoly spindle and stiff 7075 aluminum arms. And, versitile bugger that he is, the Mr. Whirly can be set up in many different configurations to fit on almost any two-wheeled steed. This one's set up for single speed (additional parts sold separately).