Felt’s AR is the brand’s aero bike and its latest version announced today sees its first significant update since 2014, when variable road/TT geometry was introduced. As well as changes to the frame’s design, Felt has made the bike stiffer, more comfortable and made claimed improvements to its aerodynamic performance. Significantly for an aero bike, the AR has some practical touches too, and it’s disc-brake only. It’s interesting that Felt hasn’t chosen to launch the new Felt AR with a fully loaded superbike spec (though Ultegra Di2 and Reynolds carbon wheels are not to be sniffed at). Often, a second-tier model gets a lower grade frame (think Cannondale’s Hi-Mod and carbon versions or Giant with the Advanced and Advanced SL) but here the AR receives all of Felt’s top-tier features. The frameset is built using Felt’s UHC (ultra hybrid carbon), which uses three distinct types of fibre. The brand claims these are all orientated to make the best use of their individual properties. It’s all bonded together with a ‘Nano-tech’ resin, which has particles of carbon embedded within it. This is said to enhance strength, and is bolstered further with the use of Textreme woven carbon. Accor...