1/2 a binding 1/2 a brain
Join Date: Apr 2004
Location: Dillon, CO
Bikes: Serotta Ottrott ST, Titus RX100, Seven Sola 29er HT in the works
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Roller resistance increases as the circumference of the roller decreases. You can also increase resistance with an integrated fan unit.
How much resistance? I don't have a measurement to contrast/compare to trainers. As a rule of thumb, trainers are the better bet for dialing in a higher resistance for interval training where rollers are the choice for developing form and endurance.