proform rockers ?

I have not owned any preform junk nor will I ever own them. Read to many horror stories about them like Norway-dart described. I would take 273 adjustable rockers any day over cheap Chinese junk. As Perfacar said replacing the stock adjusters with aftermarket adjusters is really simple. As for what little weight savings and the very minimal friction reduction the preform rockers claim I highly doubt it'd be power you would actually feel.