Well used, but still working great, wheel-on bicycle trainer from CycleOps. Resistance is dependent on how fast the back wheel is rolling, so if you gear up it gets harder, gear down it gets easier. Great for watching the TV and getting exercise in at the same time. Suitable for most bikes with quick-release axles. Comes with front wheel stand, QR axle, and three trainer tires... Two 700x23 (suitable for most road/gravel/cyclocross bikes) and one 26x1.25 (suitable for many mountain bike frames). Cash or e-Transfer only.