Originally Posted by
Hermes
Here are a couple of thoughts.... larger diameter rollers are easier i.e. require less power to spin. Typically, rollers are used for working on pedaling form and increasing cadence. To add resistance, one must add a fan or flywheel. A fluid trainer with a flywheel simulates the road better and will offer a better workout over the entire spectrum of power / heart rate levels. Rollers = z1/z2 Fluid trainer = z1 to z7.
Hermes - Appreciate ALL the feedback
! I currently use a 1upUSA trainer, and it's great for isolation type drills (i.e. "grinders", sustained or interval efforts in Z3 or >, etc.) as resistance is linear, and can be adjusted fairly easily to a higher base resistance as a starting point. . I really felt like the rollers made me concentrate on form and balance. I rode rollers that were 3.25 in. diameter, see that Kreitlers come in 4.5, 3.00 and 2.5. I'd guess 3" would be best for me, as the 3.25 I rode (not Kreitlers) were fairly easy to spin, and sounds like 2.5's would be a bit much.