Overview

This standard specifies the thread profile and limits and tolerances for the screw threads used to assemble bottom bracket cups to bottom brackets on bicycles (adjustable cups with right-hand thread, fixed (rigid) cups with left-hand thread). It is based on: a) the use of the ISO basic thread profile given in ISO 68; b) the satisfactory interchangeability with the corresponding British Bicycle Standard (B.S.C.) thread; this has required the use of an inch pitch (t.p.i.); c) the use screw thread tolerance grades and tolerance positions given in ISO 965-1; d) the use of gauges made to ISO 1502. The responsible German standardization committee is Working Committee NA 112-06-01 AA "Fahrräder für allgemeine und sportliche Benutzung" ("Cycles for common and athletic use") at DIN Standards Committee Sports Equipment (NASport).

Document: references other documents

Responsible national committee

NA 112-06-01 AA - Cycles for common and athletic use  

Responsible international committee

ISO/TC 149 - Cycles