as hes only light, replace most of the bolts with alloy ones, alloy spoke nipples, dt rev 1.8mm-1.5mm spokes, vp pedals with alloy bolts and only 1 cage are lighter than the welgo mag ones and only £10 nylon/carbon cassete spacers/headset spacers try not to run tensiner is poss light inner tubes dont get braided hose, its fair weight if you know a machinist, get nylon headset cups turned, drill out the bottom bracket spindle to atleast 7 mm dia rholloff is only of the lightest chains about and also very strong alloy rear cog foam grips drill and cut stuff