Giant have released their brand new Propel. We took a look at the Giant Propel Advanced SL Zero, the range topping bike. There have been some big claims from the bike maker, those being a 6.2 watt saving over the previous model, a 300g weight saving and of course it being stiffer in all the right places while building in compliance for a more comfortable ride. Is this just more of the same marketing headlines or is it actually a better bike?