Product details:

NOTE: Images and weight were taken of the size 50cm version. Othersizes have different dimensions and will look and weigh slightlydifferently. COMPONENTS: Frame: Tig Welded Aero Taper 6061 Aluminum, waterbotle mounts,and rear rack and fender mounts - English threadedbottom bracket(68mm)Fork: Hi-Ten Steel, caliper rim brake compatible only, 1-1/8"threadlesssteerer with mounts on the dropout for fenders - Stem: Evo Alloy 1-1/8" threadless, 100mm - Headset: Threadless, semi-integrated internal style - Seatpost:Alloy, 27.2x300mm Seatpostclamp: Alloy, 27.2mm COMPATIBILITY NOTES: Brake compatibility: Road caliper only - Hub spacing requirements: 100mm front, 135mm rear Wheel compatibility: 700c - Front derailleur compatibility: 31.8mm, bottom pull Handlebar compatibility: 25.4mm Crankset compatibility: Anything compatible with 68mm wide - English threaded shells Please note: We listed in the title and defined it, by the "Equivalent"size. There aretwo sizes to pay attention to; one that's the actual size of the seattube, the other is effectively a more accurate size which takes intoaccount the sloping top tube. For example, if younormally ride a 55cm bike, you'd pick the 52cm actual size with theequivalent size of 55cm. The manufacturer made it this way due to thetop tube that slopes downwards, making the seat tube shorter than itwould be on a bike that didn't have a sloping top tube. The box youreceive will state the "actual" size on it. SIZING: (all sizes in millimeters or degrees except where otherwise noted. - Divide millimeters by 25.4 to convert to inches) Actual - Size: 45cm (S) 47.5cm (M) 52cm (L) 55cm (XL) Equivalent Size: 50cm 52cm 55cm 58cm Seat Tube(actual): 450 475 520 550 Effective - Top Tube: 520 545 555 575 Head tube - Length: 130 140 160 180 Head Angle: 71 71.5 72 72 Seat Tube - Angle: 74.5 74.5 73.5 73 Chainstay - Length: 430 430 430 430 BB drop: 70 70 70 70 Wheelbase: 1015 1025 1030 1045 Fork - Offset: 45 45 45 45 Standover - Height: 720 745 780 810 Stem - Length: 100 100 100 100