Lets have a moment of silence for all those stuck in traffic on their way to the gym to ride a stationary bike.
BIKE BITS ON YOUR PHONE
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Shimano Ultegra R8000 11-speed derailleur pulleys.They are high quality products, where both the idler pulley and the jockey pulley (11 teeth each) have a sealed precision bearing. The advantage of this is a smoother drivetrain