Ha ha!Guys, guys, guys.I'm really disappointed!The smaller the stronger.No, a 20T sprocket isn't stronger than an 18T sprocket!The 20T Ninja sprocket broke because KHE used weak material.KHE replaced the 20T Ninja with a new, stronger version.You can't run small gear technology with U.S. BB!!20T, 18T, 16T, 14T works only with Euro BB or Spanish BB.I guess 16T or 14T/8T works only with Euro.Also you need a frame that's made for small gears.