Originally I bought the Bikehand to deal with a frozen bottom bracket as this tool has a 1/2 inch drive and also the hex shape to fit a 15/16 socket. Unfortunately my old park only has a 3/8 drive and I broke my 3/8 breaker bar trying to get the bottom bracket ukrainianblog.info, it /5(). How to Remove a Bottom Bracket Note: A very special thank you to Lunar Cycles, which is a bike shop in Camden who’ve helped me bring these repairs to London Cyclist and . A square tapered crank is the most common type, Remove A Bike’s Square Tapered Crank. A nut or a bolt pulls the crank onto the taper to jam it on.