Redline Vintage 401 Single Pinch Flight Cranks with Techmatik BB White Arm Length_135mm designed for Flatland tricks requiring Brake Mounts:Removable Brake Mounts designed for Flatland tricks requiring hands free locked brake The latest Skapegoat frame from Terrible One the Redline by Kastan 401 Flight cranks set is built to original era specifications identified as a reissue by a small RBK stamping on the rear of the arm between the spindle boss and sprocket drive boss The Techmatic Sealed Bottom Bracket Set is machined using era original specifications and supplied with the same Japanese IJK sealed airframe bearings that the assembly was designed and built around in the early 1980s