From where?
Evans had a couple of Powertap Pro track hubs going very, very cheap a while back. I got one, umop3pisdn got the other.
I only use a fixed bike with a fairly basic trainer, resistance is magnetic but enough for everything bar sprints.
Repeated, seated accelerations are the only thing I'd like power for really. A track hub would do that just fine I think.
Ah yes I remember. Balls. I would love one of those.
@Brommers started
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From where?