CycleOps' Magnetic Remote Shifter is for use with CycleOps' standard Mag trainers. It allows you to adjust the resistance without leaving the saddle and fits on your stem or handlebars.
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I bought the Mag Trainer without the magnetic shifter initially and found my self either getting frustrated with the resistance or interrupting my workout to get off and adjust it. The remote shifter addressed the issues and I absolutely recommend it. It was a bit confusing to install, but I figured it out easily enough.