The specialized sirrus expert carbon x1 hybrid bike 2017 offers the perfect blend of everyday efficiency with the performance you need to hit your fitness goals features a 1x11 sram drivetrain for a simplistic yet highly effective riding style with a high qualtiy fact 9r carbon construction that39s light weight and extremely responsive combining with a fact carbon fibre fork with zertz inserts to ensure that any road vibrations are absorbed creating an all round smoother e