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gbj_tester
Powertap track hub is my favoured option for track and for fixed gear bikes. I have six of them. The only downside is that if you try to back-pedal too hard, or skid, the internals start unwinding themselves, which is bad. If you can avoid that, they're brilliant. But the 'no back-pedalling/resisting forward motion too hard' thing might make them unviable for fixed crits. In which case, you're back to a spider or crank arm based option.