Hi people, I have bought this new Hero ranger DTB 18 speed cycle to start riding. Haven't ridden a geared bike ever and so succumbed to it. It fitted my budget too. Riding after..perhaps 25 years. But this new bike, is already creating problems. The brakes need adjustment or sticking to the rim, the Shimano gear shifts are poor. Clattering as they shift. Wondering whether I should have bought a no frills single speed cycle to break in. Any advice, including on maintenance?