Cool, but seems overly complex. Back in my MTBing days a broken derailleur from a stick in the spokes was a common occurrence. We'd make sure that one rider in the group carried a chain rivet tool. If someone snapped their derailleur we'd shorten their chain to fit one combo of chainring/cog and the victim would complete the ride in their single chosen gear. When home they would call 1-800-NASHBAR and order a new derailleur. It would arrive two days later. Often the dropout would also be bent and need straightening with a big adjustable wrench. Problem solved!
Last edited by BobG; 11-18-21 at 06:42 PM.
Reason: sp