I've got a Novara Divano '08. Like it fairly well, but find the range too narrow for my fitness level and our hills around here. As a result, I find myself taking out my touring bike out most of the time.
I want to extend the range in a rear. Currently it has 12-25, and I probably want to go to all the way to 30/34, given that I have a road crankset in the front.
Is my assumption right that I have to replace the derailleur (Tiagra), and overall, I'm looking at new casette, derailleur and chain ? Would this be all ?