6061 Forged Alloy Made to O.E.M. specifications Correct hardness to reduce damage to frame upon impact Includes mounting bolt Fits some Trek Fits some Trek Compatibility: Trek: Allant - 2015 / ALLANT - 2015-2016 / Chelsea - 2015 / Crossrip - 2013-2015 / CROSSRIP - 2015-2016 / District - 2015 / DISTRICT & CHELSEA - 2015-2016 / DS (ALL) - 2015-2016 / Dual Sport - 2013-2015 / ELAN SERIES, 825+, 885, 130 - 2015-2016 / Fisher Fast City - 2011 / FX (All alloy frames) - 201