Hi, have just ordered some new wheels for my bike. Fulcrum 7s from Wiggle. It says that they are suitable for an 8/9/10 speed cassette. I have a 9 speed Shimano Ultegra cassette, will it require a spacer to fit on the splined thingy? This is the last bit on my little bike project. I've been working on this the last couple of months. Can't wait to ride it!!