Gears for Hero Cyclone I have a Hero Cyclone bicycle that is a single speed. Can I add gears to it? If so, can anyone suggest me a good gear?
No you cannot. The Hero Cyclone does not appear to have a hanger / mounting holes for a dérailleur. You may be able to install an internal gear hub, but it would likely cost far more than the bike. 

You may be able to find something used though.