Has anyone heard of folks buying a "Smart" resistance unit and swapping it on to their older, dumber trainer? Seems like that ought to be an inexpensive way to end up with a Smart trainer.

By "Smart" I mean electronically controlled resistance.

I see lots of new Smart resistance units (no stand, just the resistance unit) for sale on ebay, but I've not found anyone talking about attaching them to a dumb trainer.

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"If only he had used his genius for niceness, instead of Evil." M. Smart