Professional road racers use Berner's uniquely oversized rear derailleur cages because they say that it reduce drivetrain friction because of its huge 15-tooth pulleys. Jason Smith of friction-facts.com confirmed that it does reduce friction through an independent testing. However, the advantage is pretty small at just 1.76 watts compared to a standard Shimano Dura-Ace setup.
You can download Jason Smith's detailed report for free: http://www.friction-facts.com/test-results/free-reports
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