Joined: Jul 2002
Posts: 40,863
Likes: 3,116
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
105 cassettes are fine. No need to spend a lot of money on a cassette for a trainer wheel. Rule of thumb: the more climbing you do, the bigger the spread you'll need. So my climbing cassette would be 11-30, while my crit or flat TT cassette would be 12-25.