Blimey really? It takes a carbon frame, the lightest forks and various high end bits and
this is still hitting 11kg with pedals...
Must admit I was a bit suprised, however, comparing the frames the R4 seems to have aluminium the thickness of a coke can in parts and I'm a bit concerned about it now. However, the wheels are very light (26in) and the geax tyres are lightweight as well, also being an MTB the frame is considerably smaller than my road bike, the weight with the forks suprised me as the Pinnacle has carbon forks but is heavier. Weight was without pedals as they are on the road bike, Time ATACS so not too heavy.
The R4 frame is anything but beefy compared to that Boardman and has a noticable ting when flicking the frame compared to the dull thud of the Pinnacle so that may account for a lot of the saving