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Hello! I have reviewed the maintenance instructions for SHIMANO NEXUS SG-3R40, SG-3C41, and SG-3D55 internal gear hubs. This document covers topics such as installation, maintenance, troubleshooting, and disassembly/assembly, providing a good overview of the features and how to maintain your 3-speed hub. I'm ready to assist with any questions you might have about your hub.
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What is the purpose of the shift assist mechanism?
How does the coaster brake on the SG-3C41 model work?
What is the difference between the standard and DX versions?