Truvativ X-Guide 2x Chainguide 36-38t: For 2x10 drivetrains with either 36-38t or 39-42t maximum chainring compatibility. Dual-ring MRP 2X Dual All-Mountain (AM) design with Truvativ branding and graphics. Replaceable truss design polymer skid plate and relieved aluminum backplate for reduced weight and stout impact protection. Front-access, single-bolt positioning of lower retention/guide (with sealed bearing pulley wheel) and captive hardware for easy installation and adjustment. 155g (ISCG-05/ISCG/BB-cup).