ASTM F2274-11

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
An American National Standard
Designation:F2274–03 Designation: F2274 – 11
Standard Specification for
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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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This standardspecification establishes testing requirements for qualifying designs using production forks intended for use
in Condition 3 per Classification F2043.
1.2Thisstandardisapplicabletosuspensionandnon-suspensionbicycleforksforuseofabicycleonroughtrails,roughunpaved
roads, and rough technical areas and unimproved trails. Contact with irregular terrain and momentary loss of tire contact with the
groundmayoccurduringusage.ThisusageisreferredtoasCondition3perClassificationF2043.Othertypesofbicycleusesexist
and other specification standards will apply for uses other than Condition 3.
2. Referenced Documents
2.1 ASTM Standards:
E739Practice for Statistical Analysis of Linear or Linearized Stress-Life (S-N) and Strain-Life (-N) Fatigue Data ASTM
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Standards:
F2043 Classification for Bicycle Usage
F2273 Test Methods for Bicycle Forks
3. Terminology
3.1Definitions of Terms Specific to This Standard:
3.1.1confidence—as used in this standard, is defined as a probability that the population value for either the mean or standard
deviation lies within a particular interval determined based on the desired probability and the sample size.
4.Classification
43.1 Condition 3 per Classification F2043.
5.
4. Sampling and Test Specimens
5.1
4.1 Selection and Preparation of Specimens:
5.1.1Five forks shall be randomly selected from the first production lot for the fatigue test per this test method.
5.1.2Three forks shall be randomly selected from the first production lot for the impact test per this test method.
5.1.3One fork shall be randomly selected from the first production lot for both the compression and bending tests per this test
method.
6.
4.1.1 Three forks shall be randomly selected from the first production lot for the fatigue plus impact test per this specification.
4.1.2 One fork shall be randomly selected for the impact test per this specification.
4.1.3 One fork shall be randomly selected for both the compression and bending tests per this specification.
5. Performance Requirements
65.1 Bicycle forks intended by the manufacturer to be used according to Condition 3 shall be tested per Test Methods F2273.
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This specification is under the jurisdiction of ASTM Committee F08 on Sports Equipment and Facilities and is the direct responsibility of Subcommittee F08.10 on
Bicycles.
Current edition approved May 10, 2003. Published July 2003. DOI: 10.1520/F2274-03.
Current edition approved March 1, 2011. Published June 2011. Originally approved in 2003. Last previous edition approved in 2003 as F2274–03. DOI:
10.1520/F2274-11.
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ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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F2274 – 11
6.1.1
5.1.1 Compression Load Test:
65.1.1.1 The fork shall withstand a compression load of 2800 N without any component failure, fracture or permanent
deformation.
65.1.1.2 Under the application of the compression load of 2800 N, the minimum clearance from the maximum tire profile
intended for use by the manufacturer to the nearest surface of the crown shall be at least 3 mm.
6.1.25.1.2 Bending Load Test:
65.1.2.1 The fork shall withstand a maximum bending load of 1500 N (100 N initial load plus an additional 1400 N).
65.1.2.2 Thepermanentdeflectionofarigidforkshallnotexceed5mmandthepermanentdeflectionofasuspensionforkshall
not exceed 10 mm.
6.1.35.1.3 Impact Resistance Test:
65.1.3.1 For each fork, permanent deflection shall be less than 45 mm following impact of a 22.5 kg mass dropped from height
number 1 such that 1, and the sample shall not develop cracks or fractures. The velocity at impact shall be at least 2.66 m/s. Note
that in a frictionless system, this velocity would be achieved for height number 1with a drop height of 360 mm.
65.1.3.2 For each fork, following impact of a 22
...