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Slang for an experienced bike mechanic. It takes several years to become a shop rat. Only after spending thousands of hours building bikes, building wheels, rebuilding suspension forks and shocks, setting up derailleurs, replacing bottom brackets, rebuilding hubs, matching chainrings/cranksets/cassettes, and bleeding every type of hydraulic brake system does one become a shop rat. A shop rat is the guy/gal you want to talk to about your bike's issues. They've seen every possible problem a million times over and know how to fix it professionally and quickly. They also know secret repair tricks that you'll never find in a service manual or on YouTube. The opposite of a Tool Box Ted.
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