ASTM F2274-11(2016)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F2274 −11 (Reapproved 2016) An American National Standard
Standard Specification for
Condition 3 Bicycle Forks
This standard is issued under the fixed designation F2274; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope intended for use by the manufacturer to the nearest surface of
the crown shall be at least 3 mm.
1.1 This specification establishes testing requirements for
5.1.2 Bending Load Test:
qualifying designs using production forks intended for use in
Condition 3 per Classification F2043.
5.1.2.1 The fork shall withstand a maximum bending load
of 1500 N (100 N initial load plus an additional 1400 N).
2. Referenced Documents
5.1.2.2 The permanent deflection of a rigid fork shall not
2.1 ASTM Standards: exceed5mmandthepermanentdeflectionofasuspensionfork
F2043 Classification for Bicycle Usage
shall not exceed 10 mm.
F2273 Test Methods for Bicycle Forks
5.1.3 Impact Resistance Test:
5.1.3.1 For each fork, permanent deflection shall be less
3. Classification
than 45 mm following impact of a 22.5 kg mass dropped from
3.1 Condition 3 per Classification F2043.
height number 1, and the sample shall not develop cracks or
fractures.Thevelocityatimpactshallbeatleast2.66m/s.Note
4. Sampling and Test Specimens
that in a frictionless system, this velocity would be achieved
4.1 Selection and Preparation of Specimens: with a drop height of 360 mm.
4.1.1 Three forks shall be randomly selected from the first
5.1.3.2 For each fork, following impact of a 22.5 kg mass
production lot for the fatigue plus impact test per this specifi-
dropped from height number 2, the connection between the
cation.
steerer tube and crown must withstand at least 108.5 Nm of
4.1.2 Oneforkshallberandomlyselectedfortheimpacttest
torque without rotation. The velocity at impact from drop
per this specification.
height number 2 shall be at least 3.43 m/s. Note that in a
4.1.3 One fork shall be randomly selected for both the
frictionlesssystem,thisvelocitywouldbeachievedwithadrop
compression and bending tests per this specification.
height of 600 mm.
5.1.4 Fatigue Plus Impact Test:
5. Performance Requirements
5.1.4.1 Each fork shall withstand a fully reversed sinusoidal
5.1 Bicycle forks intended by the manufacturer to be used
load of 650 N for at least 100 000 cycles without structural
according to Condition 3 shall be tested per Test Methods
cracks or fractures and without exceeding the displacement
F2273.
limits described in Test Methods F2273.
5.1.1 Compression Load Test:
5.1.4.2 If the fork withstands 100 000 cycles, it shall be
5.1.1.1 The fork shall withstand
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