CycleOps Mag Shifter Upgrade Unit

CycleopsMag Shifter Upgrade Unit. Need to adjust the resistance quickly and easily on your trainer due to your incredible power output don't want to hop off mid session to adjust that resistance Then the Cycleops Mag Shifter Upgrade unit is for you. It fits easily to most bars or stems so you can adjust the resistance higher and lower on your Mag unit depending on your session goals Features Adapter for standard mag unitsQuick release mounting systemBuy CycleOps Nutrition & Training from Chain Reaction Cycles, the World's Largest Online Bike Store.