One bike is never enough, I need a Windcheetah with fairing, a proper track bike with Campag, a Mercian tourer w. Suntour XC Pro/Superbe mix, a Ti Brompton and a Storck with Posh all over it. When I built my mountain bike I was trying to build my ultimate XC, and got pretty close. Before I replaced the Pace carbon forks with Rockshox it was sub 18lbs. Since I built it Scott have released their super light carbon frames and that's what I would have started with if I were building it today.
Rocky Mountain Vertex Team Scandium hardtail. 19.5", 2.9lbs.
Mavic CrossMax ceramic wheel set.
White RockShox SID World Cup Black Box w. carbon crown and steerer.
Easton carbon bars and post and FSA stem.
White RaceFace (square taper) Turbine cranks on RaceFace Ti BB.
GoldTech Ti rings w. Ti nitride, 40t, 30t.
SRAM 9spd cassette, SRAM 10spd hollow pin chain.
SRAM X.0 rear mech, Sachs Quartz front mech, White SRAM 9.0sl shifters.
Avid Ultimate brakes, Avid Supreme levers.
White Selle Italia Gen Gel, Ti rail.
Expedo Ti pedals.
SRP gold anodised alu bolts or Pace Ti bolts throughout.
White Federal grips.
Tioga Red Pheonix 1.8 SL tyres with Stan's No-Tubes.