The Trail SL 5 is designed with Cannondale's trademark double-pass smooth-welded technology which gives the Trail SL 5 it's handcrafted aesthetic. The Trail SL 5 uses double butted tubing for an increase in frame strength & stiffness with no comprise on weight. The Trail SL 5 uses the One Point Five Standard head tube this helps to stiffen & lighten the frame making steering better