A spare bolt-on rear dropout is invaluable if your derailleur gets whacked and your original gear hanger needs replaced.   Worth carrying as a spare, especially on long trips and more epic rides. To find your hanger code please refer to the charts pictured (Model Years 2010 through 2017). If your unsure as to which hanger you require or can't see your bike listed please contact us by email, phone or drop into your local store. Whyte Hangers (Updated January 2018) Whyte 29-C Dropout Hanger Features 20-C WORKS XX (2012), 20-C TEAM (2012-13), 20-C S (2012-13), 20C (2012-13), 29-C Team (2013-16), 29C-S (2012-16), 29-C (2012-15), Montpellier (2013-14), 29C-S (2017-18), 29C Team (2017-18)