Felt AR4

FOR TRIATHLONS AND FAST GROUP RIDES

Felt cribbed most of the tube shapes on the AR4 directly from its triathlon-specific DA, and then sculpted the bike in a wind tunnel to minimize drag, cutting precious seconds from riders' times. While narrow tubes are great at slicing the air, they also make the AR4 less stiff under power than conventional designs. So if you're strictly into sprinting, the AR4 isn't for you. But if you love a quick group ride or want to try a triathlon, there's no road bike more versatile. [$3,500; feltbicycles.com]