Smith says a stock Shimano Dura-Ace pulley cage creates 14.19N (3.19lb) of lower chain tension whereas a Berner’s more lightly sprung setup creates less than half at just 6.85N (1.54lb). In general, less tension is better than more. A standard Shimano Dura-Ace 11/11-tooth pair of pulleys takes 2.6 watts of power compared to 2 watts on Berner’s ceramic-enhanced 13/15-tooth setup.Ĭage tension also apparently plays a role. Subbing in the standard manufacturer’s bearings – but still maintaining constant lower chain tension – extends that difference further, says Smith. The Y axis is chain articulation (how much the chain bends) through the pulleys the x-axis displays watts while the y-axis displays total chain articulation angle Jason Smith/ Smith’s test results confirm a slight advantage to the Berner system. the x-axis displays watts while the y-axis displays total chain articulation angle: the results of friction facts’ rear derailleur pulley and cage testing confirm the (slight) advantage of berner’s oversized assembly. The results of friction facts’ rear derailleur pulley and cage testing confirm the (slight) advantage of berner’s oversized assembly.
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