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Most Heds (NOT Specialized) with a black steel rotor should be convertible. I'm not sure whether some very early Heds may have the non-convertible 6200 pattern freehub which was used on all the Specialized freehub wheels.
A strict reading of Regulations would make use of any kind of suicide hub illegal in a CTT time trial, but fitting a rear brake caliper would at least make it pass the "road legal" part of the Reg.
My bad. I was thinking of one of these:
...which would still work for Scilly as he wont be braking with his drivetrain
Is there an easy way to tell if a rear HED can take a fixxer?