Only fits on a Trek Madone gen 8 in combination with a Sram Aero Chainring The new Trek Madone Gen 8 Chain keeper for Sram Aero Chainrings (RED-Force).   Designed to fit seamless on your Madone Gen 8 frame Light weight at only 8,3 grams (including bolts)   Designed and tested together with Team Lidl – Trek.   The Chain Keepers are used by the following pro teams: Lidl – Trek   The product is including: A Chain keeper 2 black stainless steel bolts