Joined: Feb 2013
Posts: 1,472
Likes: 11
From: Near St. Louis, Missouri
Bikes: Giant Defy Advanced, Breezer Doppler Team, Schwinn Twinn Tandem, Windsor Tourist, 1954 JC Higgens
It's very likely that you would need a rear derailleur with more tooth capacity and a longer cage to take up the extra chain when in the small chain ring.