Nicely done. It very much resembles a standard bicycle indoor trainer. http://www.nashbar.com/images/nashbar/products/medium/AS-FT1-NCL-ANGLE.jpg Sometimes you can find old ones (called fan trainers, as they used hockey table fans instead of magnets or fluid for resistance) for $20-50. They will generally fit a MB with standard axle nuts (3/8 or 10mm axle). Some only seem to fit old road bikes (short axle length, about 125-130mm between the dropouts). The fan and flywheel part can be moved off the wheel or removed.