Shimano Pulley Set RD-6700 - Jockey Wheels - Ceramic for Ultegra, XT, Saint 11T 4524667360773 | eBay
Jockey Wheels | Bikebug
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Shimano Y5XF98130 RD-M773 Guide & Tension Pulley Set :: £13.80 :: Components. :: Gears Rear - Spare Jockey Wheels 9/10/11 Speed :: For Hand built bike wheels & all your cycling needs!
Friction Facts: Bigger pulleys really are more efficient - BikeRadar
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Shimano XT M8000 Guide & Tension Jockey Wheels Pulley Set | New Era Cycle
How To Clean/Lube Rear Derailleur Pulleys - YouTube