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SHIMANO Ultegra FC-R8100 Ultegra 12-Speed Double chainset, 52 / 36T 175 mm : Sports & Outdoors - Amazon.com
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EuroBikeParts: Shimano Ultegra R8150 12s Di2 Electronic Group - Rim Brake, Shimano, SH-UL8100-RIM-Di2-Full
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Shimano launches 12-Speed Ultegra R8100 Di2: Wireless Cockpit, Faster Shifting + Improved Brakes - No New Wheel Standards / Freehubs! - Gravel Cyclist: The Gravel Cycling Experience
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EuroBikeParts: Shimano Ultegra R8170 12s Di2 Hydraulic Disc Electronic Group, Shimano, SH-UL8170-Di2-Full
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