Can i put a 10 speed cassette on a new Tiagra back wheel. Some sites (e.g. wiggle) say that the wheel is 8/9 speed compatible only. I thought that the 9 speed and 10 speed cassettes were the same width in total so were interchangeable......If not, any other inexpensive shimano compatible wheels you might recommend....(i want to stop using my nice wheels for my commute!)