Blackburn TrakStand Mag 3 indoor bicycle magnetic trainer for sale. Used a couple of times ~ in good condition. Below if info from the manufacture... Designed to get you "out" for a ride for those times you simply can't get out. Whether you're craving a technology-free trainer session or a ride with your virtual crew, the TrakStand Mag 3 can help you tally the miles. Our easy-to-store, foldable trainer frame features an adjustable resistance unit with three levels that can be used for any virtual - or non-virtual - training ride. * Three levels of magnetic resistance let you customize your workouts for spinning or strength training * Large frame tube keeps riders stable * Foldable design makes this trainer easily portable * Adjustments to suit 700c & 26" wheels * Boxed steel frame * Compact and light