its not my bike but here is the info for the Giant SCR4. I am assuming this fits for all SCR4's.
Taken from
http://sports.ciao.co.uk/Giant_SCR_4_0__6836438
Manufacturer's product description
Giant SCR 4.0 2008 Features:
Whether it's a casual Saturday morning spin or tackling your first century, the SCR series promises Giant's ALUXX aluminum frame comfort and Compact Road ride. With enough gears for your daily commute and on your weekly club ride.
Frame Technology: Featuring a butted ALUXX aluminum frame and T-700 Composite fork, SCR geometry delivers equal parts performance and forgiving positioning for all-day comfort perfectly matched to nimble handling.
Specifications: SIZES 42, 46.5, 50, 55.5, 58.5cm FRAME ALUXX aluminium, Fluid Formed, Compact Road Design FORK CroMo SHOCK N/A HANDLEBAR Aluminium STEM GIANT A3 aluminium ahead SEAT POST Aluminium SADDLE WTB Road Performance PEDALS Steel with resin body and toe clips SHIFTERS Shimano 2200 16 speed STI FRONT MECH Shimano 2200 REAR MECH Shimano 2200 BRAKES Dual pivot long reach BRAKE LEVER Shimano 2200 STI CASSETTE SRAM PG850 12-26 CHAIN Shimano HG73 CRANKS TruVativ Touro 2.0 36/50 BOTTOM BRACKET TruVativ Power Spline RIMS Alex DA22 HUBS Formula SPOKES Stainless steel TYRES Kenda 700x26mm