Join Date: Dec 2005
Location: O'Fallon, MO
Bikes: 1973 Raleigh Professional, 1993 Raleigh Technium Olympian, 2006 Cervelo Dual, 2008 Cannondale Caad8, 2010 Kona Unit, 2013 Trek Superfly 100 AL Pro, 2014 Trek Crockett 9
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I have had a set of Kreitlers with 2.25" drums since 2006. I do all of my indoor riding on them. (Which is a LOT since I have to deal with Midwest Winters and don't typically get outside during the week - even in the Summer.)
I ride both my tri & road bikes on them. As a triathlete, I don't do all-out sprints. But, I have no problem getting 350W+ at 90rpm in the 53/12 with 2.25" drums. The smaller the drum, the more resistance.
I can ride aero, standing, no-hands, whatever. No issue. You do have to pay attention and relax, though.