the way i learned to spin was to build up a fixed wheel road bike.I found an old track frame and used some old gear i had lying around bought what i did not.The best thing about using an old track frame is a lot of them have holes to bolt brakes on to them.I use a 42x17 gear on mine which allows me to spin on the flat and push a bigger gear than i used to on the hills so you get the best of both worlds.I understand that some people do not want to buy another bike or spend time geting used to riding a fixed wheel,trust me it is a lot different to riding with a freewheel,but i would recommend doing if you want too get the best from your riding