The Series One was the first frame when FITBIKECO started back in 2000 and it’s their most popular bike to date. For 2026 they've upgraded to a CNC machined Integrated headtube and a fully sealed bearing front hub. The S1 frame and fork has been lightened up and offered in 3 top tube sizes with corresponding handlebar and crank sizes. SERIES ONE (20.75”) TT SIZE: 20.75” FRAME: Cro-Mo Front Tri GEOMETRY: Series One HEADSET: Integrated w/Gyro Holes BB: Sealed Mid BARS: 2-Piece 9” x 29” FORK: Cro-Mo Steerer, 33mm Offset, Welded Insert STEM: FIT Top Load SEAT: More Padded Integrated Combo, 200mm Post CRANKS: Tubular Cro-Mo 170mm SPROCKET: FIT Key 25T PEDALS: FIT PC FRONT WHEEL: FIT S1W Rim w/Sealed Hub REAR WHEEL: FIT S1W Rim w/Sealed 9T Cassette TIRES: FIT OEM 2.4” BRAKES: U-Brake w/Low Tension Springs, Two Finger Lever, Linear MISC: Sealed Front Hub/ Integrated HT New for 2026
