Shops don't really like to install provided parts for a number of reasons, I wouldn't ask them to do so. If you replace the cassette before the tune up they, during the service, will correct any issues that you might not have done well. In fact I would suggest that you mention this at the drop off. If you wait till after, the work they do to adjust the read der might be useless as often tweaking adjustments to ders and cables is needed with different cassettes.


I always tell my customers that if they want to do any work (to save cost, learn, whatever) to do so before we work on the bike. At best we have an easier time and the customer saved some $. At worst we take care of improper work and the customer still has a reliable bike. Andy