American Bottom Bracke
http://www.youtube.com/bikemanforu How to switch from a one-piece to a three-piece crank. Part One of the BikemanforU series, American Bottom Bracket Four Ways. The video tutorials in this series use different methods for upgrading your American bottom bracket shell to gain more choices and lighter weight in your bicycle drivetrain. Converting the inside of the BBT shell (or hanger in old cycling lingo) on your bike from an American to European thread means you can let go of the one-piece ashtabula (or American) crank and enter the new world of three-piece cranksets. Change your sprocket / chainring or arm length at will. s of bottom brackets. In this series, BikemanforU shows us techniques for working with different BBT adapter kits, and bottom brackets themselves. The techniques will work whether you're upgrading to a new single-speed or multi-speed crank. Free Shipping http://www.bikemanforu.com/ on bike parts, tires, tools, and cycle accessories. Part one of the series covers what has to be done first – get the old American (ashtabula) one-piece crank off and the old loose-bearing bottom bracket out of the bicycle, cleaning the inside of the shell (or hanger in old cycling lingo), and then installing a thread converter kit that will allow the crank set upgrade. For his first tutorial, BikemanforU prepares the American BBT shell in preparation for installing a TruVativ American to European thread adapter kit and a SunLite maintenance free sealed bearing cartridge bottom bracket. The video assumes you know the width of your BBT shell and the desired length of your axle / spindle. Don't worry if you don't. We have video links to help you out. Most American BBT shells are 68mm. Rarely, a 73mm shell appears, usually on early mountain bike models.