Ann Arbor Cyclery is your best bet for friendly, knowledgeable, quality bicycle service in Ann Arbor. I took my 10 yr old GT Tequesta mountain bike in to replace: a cracked headset, locked front derailleur, stripped cassette, rusty chain, missing spokes, and some cables.  :) I took the bike to several other local shops and got quotes exceeding $250. I was immediately impressed with the friendly and open attitude of both employees at the shop. I was sold when the total repair cost was almost half that of 'the other guys'. Support your local bike shop: support the Ann Arbor Cyclery! -Paul Barton