Which is better 7 gear or 21 gear?
Good 7 speed is better than entry level 21 speed. The 21 speed usually aimed for higher speeds as in road and hybrid bikes. It should be a minimum of Altus or equivalent, else it’s just a gimmick. If you are planning regular bike with regular tyres, better go for 6 or 7 speed. In terms of how the number of gears affects the overall ride of the bike, a 21-speed is generally faster with smoother transitions and pedaling. The 7-speed is adequate for most riders, which is why many people choose the slower option.