Reviving this thread unless it`s 5lb difference on an identical bike so many other factors…in last 6 months have ridden Syfyrrdin Taril at Nant yr Arian on 3 different bikes noting times:
June on Ti Van Nic (25-26 lbish) 2hr 37 min
September on Giant Trance FS (30 lbish) 2hr 43 min; legburner climb 16.5 min
October on Cotic BFe (30 lbish) 2 hr 30 min, legburner climb 15.7 min
As I weigh , with Camelbak kit etc, 190 lb my conclusion from above is that it`s more about the bike overall than bike weight per se. Of all above Cotic by far the most fun to ride and most lively feeling 🙂