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oversized rear derailleur pulley
I'm offering a summary of: "Do Oversized Derailleur Pulleys Really Help?" parts 1 and 2. . My rear derailleur capacity was 39 (Shimano RD-R8000-GS). I fitted an oversize pulley wheel (J&L) with the same cage length and an 18 tooth tension jockey wheel (replacing 11t). It now easily manages the required 44 tooth capacity. I had to . When the chain moves through the jockey wheels, a small amount of energy is required to turn the actual wheels, and reducing this energy is what Oversized Pulley Wheel Systems (OPWS) aim to do. OPWS use large-diameter sprockets to guide the chain—typically 15-17 teeth, compared to 11 teeth on a stock Shimano or SRAM rear .
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oversized rear derailleur pulley