Spin bikes, just like you use in spin classes at the gym (don't forget our video explaining the difference between upright, recumbent and spin bikes).
Spin bikes have a solid, externally-visible spinning wheel to give momentum to your exercise routine. Noisier than upright bikes, spin bikes feel and respond more like a real road bike.
Remember, you can compare different spin bikes against each-other by clicking the arrows icon below each product you want on the list. (...more details)