IS 1281 : 2014 : Bicycles - Cranks and Chain Wheels - Specification

Reaffirmed 2023

FOREWORD

This Indian Standard ( Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Bicycles Sectional Committee had been approved by the Transport Engineering Division Council.

This standard was first published in 1958 and subsequently revised in 1968 and 1996. This revision has been undertaken to up date in the light of experience gained during these years and the present trade practices that have followed. In this revision following technical changes have been made:

a) Classifications of chain wheels and cranks,

b) Use of aluminium as alternate materials of cranks,

c) Dimensions and figures of double and triple speed crank and chain wheels,

d) Requirements of deflection and offset of crank and the method of measurement,

e) Static load strength for pedal fixing point,

f) Drop impact test for the crank in horizontal and vertical positions, and

g) Repeated fatigue strength for crank.

The composition of the Committee responsible for the formulation of this standard is given in Annex A.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.