Diamondback Bicycles 2015 Insight Sti-8 Complete Performance Hybrid Bike Hand built 6061-t6 aluminum alloy frame is durable and comfortably compliant Integrated aero alloy straight blade fork delivers quick, confident handling Frame and fork eyelets let you mount rack and fenders Shimano nexus 8-speed internally geared hub is simple and reliable Linear pull brakes and 700c wheels