The SLR Endurance 9. 2 Dura Ace Complete Road Bike's Dura Ace shifting and carbon fiber FSA crankset should tell you all you need to know about the top end mechanical entry in Boardman's so called endurance line. Specifically, it's a race bike, not just a comfort rig. By relocating the endurance bike from the SLS's gran fondo neighborhood to the SLR's racing borough, Boardman has removed any doubts about the SLR Endurance's true intentions: behind the facade of a more upright geometry lurks the stiff, low weight aggression of a long distance killer. We're happy that Boardman is finally broadcasting the SLR Endurance frame's capabilities rather than tucking it away in the SLS line where it tended to be unnecessarily and unfairly relegated to sportive duties. Despite the shakeup of naming conventions, Boardman sticks with the same materials that it uses in the standard SLR race frames. Each SLR Endurance chassis comprises a targeted layup of T1000 and T800 Carbon, which balances considerations of stiffness, price, and the ability to erase road noise, chip seal chatter, pave, and even feedback from gravel roads for a ride that's not just limited to well groomed roads. The SLR Endurance's post tarmac pedigree also owes a debt to the frame's geometry, which mirrors the outgoing SLS. Compared to the standard SLR, the endurance model has a shorter head tube and longer chainstays by about 20 and 5mm, respectively for a longer, more centered wheelbase that boosts stability across less than ideal surfaces. It's also got a higher stack and shorter reach, dimensions that benefit the recreational cyclist or the racer who recognizes the value of a comfortable ride position in races that last longer than 50 minutes spent circling a city block. These variations are also good news for those of us whose height means that there's always a gap between sleeves and gloves, tights and booties. The SLR Endurance's geometry means tall cyclists don't have to add a comical exp...