上游充通大学 SHANGHAI JIAO TONG UNIVERSITY Step 1:Prepare the list of metrics Ideal case: >There is one and only one metric for each need m L Metric Imp Units 13 Attenuation from dropout to handlebar at 10hz dB 2.6 Spring pre-load N 国 1.3Maximum value from the Monster Some times,difficult need g 4 1,3 Minimum descent time on test track 5 4 Damping coefficient adjustment range 3 N-s/m may require several metrics to 5Maximum travel (26in wheel) mm 5Rake offset mm 6Lateral stiffness at the tip kN/m translate 9 7Total mass kg 10 8Lateral stiffness at brake pivots 2 kN/m 11 9Headset sizes n >In the fork case,metrics 12 9Steertube length mm 13 9Wheel sizes 5 list 14 9Maximum tire width n for Need1(Reduces 15 10 Time to assemble to frame 16 11 Fender compatibility list Vibration to hands) 17 12 Instills pride subj 18 13Unit manufacturing cost 5 USS 19 14 Time in spray chamber w/o water entry s ·Metric1 20 15 Cycles in mud chamber w/o contamination K-cycles 2116,17Time to disassemble/assemble for maintenance Metric 3 2217,18Special tools required for maintenance 23 19 UV test duration to degrade rubber parts hours Metric 4 2 19 Monster cycles to failure cycles 25 20 Japan Industrial Standards test binary 26 20Bending strength (frontal loading) 5 MNStep 1: Prepare the list of metrics Ideal case:  There is one and only one metric for each need Some times, difficult need may require several metrics to translate  In the fork case, metrics for Need1(Reduces Vibration to hands) • Metric 1 • Metric 3 • Metric 4