Shimano components interchangable

magoo289 Posts: 223
edited January 2011 in Road buying advice
I've just bought new wheels for the summer and speaking to a friend he told me of his difficulties in changing the cassette over. So I thought it might be easier buying a new cassette for the spare wheels. If I buy a new casssette I would like to start the upgrade of components.

Would an Ultegra 10 spd cassette work with the remaining Tiagra components? I take it I would also need a 10 spd chain to make this work?