1、Designation: F2274 11An American National StandardStandard Specification forCondition 3 Bicycle Forks1This standard is issued under the fixed designation F2274; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification establishes testing requirements forqualifying designs using production forks intended for use inCondition 3
3、per Classification F2043.2. Referenced Documents2.1 ASTM Standards:2F2043 Classification for Bicycle UsageF2273 Test Methods for Bicycle Forks3. Classification3.1 Condition 3 per Classification F2043.4. Sampling and Test Specimens4.1 Selection and Preparation of Specimens:4.1.1 Three forks shall be
4、randomly selected from the firstproduction lot for the fatigue plus impact test per this specifi-cation.4.1.2 One fork shall be randomly selected for the impact testper this specification.4.1.3 One fork shall be randomly selected for both thecompression and bending tests per this specification.5. Pe
5、rformance Requirements5.1 Bicycle forks intended by the manufacturer to be usedaccording to Condition 3 shall be tested per Test MethodsF2273.5.1.1 Compression Load Test:5.1.1.1 The fork shall withstand a compression load of 2800N without any component failure, fracture or permanentdeformation.5.1.1
6、.2 Under the application of the compression load of2800 N, the minimum clearance from the maximum tire profileintended for use by the manufacturer to the nearest surface ofthe crown shall be at least 3 mm.5.1.2 Bending Load Test:5.1.2.1 The fork shall withstand a maximum bending loadof 1500 N (100 N
7、 initial load plus an additional 1400 N).5.1.2.2 The permanent deflection of a rigid fork shall notexceed 5 mm and the permanent deflection of a suspension forkshall not exceed 10 mm.5.1.3 Impact Resistance Test:5.1.3.1 For each fork, permanent deflection shall be lessthan 45 mm following impact of
8、a 22.5 kg mass dropped fromheight number 1, and the sample shall not develop cracks orfractures. The velocity at impact shall be at least 2.66 m/s. Notethat in a frictionless system, this velocity would be achievedwith a drop height of 360 mm.5.1.3.2 For each fork, following impact of a 22.5 kg mass
9、dropped from height number 2, the connection between thesteerer tube and crown must withstand at least 108.5 Nm oftorque without rotation. The velocity at impact from dropheight number 2 shall be at least 3.43 m/s. Note that in africtionless system, this velocity would be achieved with a dropheight
10、of 600 mm.5.1.4 Fatigue Plus Impact Test:5.1.4.1 Each fork shall withstand a fully reversed sinusoidalload of 650 N for at least 100 000 cycles without structuralcracks or fractures and without exceeding the displacementlimits described in Test Methods F2273.5.1.4.2 If the fork withstands 100 000 cy
11、cles, it shall besubjected to an impact test in which the mass is dropped fromheight number 1 as described in 5.1.3.1.5.1.4.3 Following this impact test the permanent deflectionshall not exceed 45 mm.6. Rejection and Rehearing6.1 If any sample fails to meet all the requirements of thisspecification,
12、 the fork models shall be rejected.7. Certification7.1 When specified in the purchase order or contract, areport of the test results shall be furnished pursuant to thereport as described in Test Methods F2273.8. Keywords8.1 bicycle forks; condition 3; fatigue; impact; load test;qualifying designs1Th
13、is specification is under the jurisdiction of ASTM Committee F08 on SportsEquipment and Facilities and is the direct responsibility of Subcommittee F08.10 onBicycles.Current edition approved March 1, 2011. Published June 2011. Originallyapproved in 2003. Last previous edition approved in 2003 as F22
14、74 03. DOI:10.1520/F2274-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 10
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