Shimano CS M8100 12 10 51T Heart Rate Monitors CNC machines offer near perfect accuracy With our unique tread CNC machines offer near perfect accuracy which is why we chose this manufacturing process for our chainrings groundbreaking new design and technology Using SHIMANO's new MICRO SPLINE freehub body and HYPERGLIDE+ tooth profile these 10 45 and 10 51T cassettes deliver advanced shifting performance
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