The trek superfly 5 mountain bike 2017 has been tailored to deliver true xc racing speed featuring a super light aluminium frame amp efficient spec that39s tailored for speed the hydro formed aluminium frame has been continuously cold extruded to create a sophisticated set of tubes that deliver maximum strength for minimal weight g2 geometry ensures that the superfly doesn39t feel sluggish on bigger wheels this advanced frame geometry incorporates a custom offset fork to ensure preci