While on the subject of a new cassette, I currently have a compact crank with a 11-25 cassette in the back. Thinking about getting the wheel in this thread for the trainer. If I'm going to get a new cassette, do you think it's worth it to get the same one (11-25) or get the 12-27? Thinking of puting the 11-25 on the trainer wheel and use the 12-27 on the bike. Suggestion is appreciated.