So you're no longer gnarly enough for single speed, eh? Well, at least Problem Solvers still has your back.
This neat little dealio works on bikes with rear facing dropouts, it allows you to securely hang a derailleur AND keep your wheel in place (did your brain just explode?)
For use with 10mm axles
Horizontal dropouts only
Specifications
Deraileur Hanger Style
Universal
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I'm very happy with this system for attaching a rear derailleur to a track bicycle. The dislike I listed isn't really that big a deal, although including a few sizes of dropout caps to fit different track bike dropout widths would add pennies to the manufacturer's cost, but totally convenience customers.