The booster is designed for high power workouts at low speed. It works off magnetic resistance and boasts a 2kg flywheel, so retains some momentum when you ease off the pedals. It can also handle a sprint without bogging down or spinning out and is stable under power. It has 10 resistance settings controlled via a bar lever, and we found every level save for the lowest to be really hard work-ok if you're a bigger rider or want to do low rev workouts, but not a lightweight who likes to spin.
(Posted on 21/09/2011)