I think that this is a perfect bike for pumptrack riding..it dont have to be lighter or stronger. Its perfect. except one thing..I really dont understand the bar choice. Whats the point? A 710 mm wide carbon xc bar would be perfect. or anythung else. may be its just for me but its too small
Why rigid forks? you should buy some suspension forks and a smaller stem and yes a 710mm wide carbon bar and it would be perfect. With these stuff the bike can come under 8,5 kg.