Diamondback response comp 275 inch mountain bike frame alloy vectra double butted hydrofomed tubing integrated headset forged dropouts fork suntour xcr air remote 275 suspension headset 1 18semi integrated threadless stem easton ea50 speed 27 front mech shimano deore m590 rear mech shimano deore shadow chainset shimano alivio 2pc 40x30x22t bottom bracket shimano sealed external cup type cassette shimano hg30 11 34t chain kmc z99 front