I have a saracen helix bike, its a few years old now, but I like it. I was toying with the idea of a new bike (road bike but with flat bars). But thought that maybe I could save money and just upgrade the one I have. I have read that wheels and tyres are probably the best upgrade you can do. But have not got a clue how to start to pick a decent set. Can anyone recommend some decent upgrade wheels, and any other good upgrades I could do. I could probably spend a couple of hundred pounds in total. Cheers