Until recently, few people went cycling, but (0) __over__ the last few years, more bikes have (1) sold in Britain than cars. Now, approximately two million (2) bought each year, the majority of them are mountain bikes. There are over 500 different models to choose (3) , and the prices vary enormously. The cheapest can be bought for under £200, (4) you will need over £4.000 for a bike at the top end of the range. The reason (5) this difference is the quality of the frame. Cheap bikes are not recommended for anything more than occasional use (6) they may not have been assembled properly and therefore are not safe to ride. Furthermore, they may get easily damaged because they are often not very (7) made. The more expensive models are much lighter because they are made (8) metals like aluminum.