I have a 2000 Raleigh m20. I want to buy a new rear wheel, however, I do not know the space between the chain stays and donít know what will fit. I run a 7 speed cassette in the back, will it fit any new wheels? Another thing I want to know is the size of my bottom bracket. If you know please do tell. If you know a site that can give me this information please post the link. Thanks in advance.