Originally Posted by
utoner34
Currently I own ~ 10.5kg aluminum xc bike. I like to train on uphill roads (average 8-9% of gradients or so)
Lets say I buy a crabon frame ~8kg bike. Will this make my times significantly faster?
Climbing speed is inversely proportional to total weight.
Assuming you weigh 70kg, dropping that 2.5 kg of bike weight will make speed 80.5 / 78 kg = 1.032 times what it was before; or save 2.5/80.5 x 3600 = 112 seconds per hour.