The German-made Berner rear derailleur cage features enormous pulleys that are claimed to decrease drivetrain friction.. Photos | Cyclingnews.com

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The German-made Berner rear derailleur cage features enormous pulleys that are claimed to decrease drivetrain friction.

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The German-made Berner rear derailleur cage features enormous pulleys that are claimed to decrease drivetrain friction.

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The German-made Berner rear derailleur cage features enormous pulleys that are claimed to decrease drivetrain friction.

Photo: © James Huang

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