THE CPSC (CONSUMER PRODUCT SAFETY COMMISSION) ROAD TEST OF BICYCLE BRAKING PERFORMANCE - KINETIC AND ERROR ANALYSES

The Consumer Product Safety Commission has promulgated a safety standard for bicycle braking systems based on the stopping distances achieved in road tests under specified conditions. This report presents an error analysis of the test method, for the Commission's use in justifying or modifying the test criteria. The error analysis is based on experimental data, for the most part, and on theoretical principles where sufficient data are lacking. The theory, a kinetic analysis of the bicycle braking process, is included in the report together with proposed definitions of terms intended to quantify important aspects of bicycle braking performance. The error analysis produced estimates of rather large lab-to-lab and test-to-test variabilities to be expected from the test method. These, in turn, were found to be principally dominated by errors resulting from an incorrect overweight-rider allowance specified by the Commission, and by variations in rider reaction times, respectively. Suggestions are made for more accurate methods of accommodating variations in rider mass, for reducing the effects of the test-to-test variability, and for reducing the danger of pitchover in the performance of the road test.

  • Supplemental Notes:
    • See also report dated Aug 75, PB-248 642.
  • Corporate Authors:

    National Bureau of Standards

    Engineering Mechanics Section
    Washington, DC  United States  20234

    Engineering Mechanics Section.

    ,    
  • Authors:
    • Mordfin, L
  • Publication Date: 1975-10

Media Info

  • Pagination: 75 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00136496
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NBSIR-75-786 Final Rpt.
  • Files: TRIS
  • Created Date: Jul 13 1976 12:00AM