Minoura Mag-850 Gravity Trainer (dial adjustable): Gravity frame with single sided magnetic resistance unit with a 850 gram steel flywheel. Tire-to-roller pressure adjusts automatically. Dual-sided axle tensioners allow for centering tire on roller...
a Cross Country Rider
Date Reviewed: December 11, 2006
Strengths: The trainer is quiet running. Am using a kenda Kwest 100 psi rear tire. Its quiet enough to watch TV while exercising. The handlebar remote is easy to use. The flywheel is big enough to give smooth pedaling on all the resistance settings. I usually use the highest resistance setting using the largest front chainring and the fifth gear on the rear cassette. Shifting up to the highest gear gives very strong resistance for a harder workout. The unit comes with an all metal quick release skewer so you don't have to use the plastic capped shimano type. The unit is easy to set up. There is a foot pedal to engage and disengage the rear tire from the flywheel.
Weaknesses: None so far. It is accumulating some black rubber dust on the floor under the rear tire, so there is some tire wear using the trainer.
The MAG 850R is a good quality trainer. The pedal feel is realistic and pedaling is very smooth. There is enough resistance in the higher settings to exceed what I encounter in normal street and trail riding.