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Amazon.com : 4iiii Precision Powermeter Left Side | Shimano Ultegra R8000 | 170mm | Measures Each Pedal Stroke with 3 Strain Gauges : Sports & Outdoors
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4iiii Shop - USA/World: Single-sided and dual-sided power meters for Shimano, SRAM, Praxis, and Campagnolo cranks
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