The Series One was the first frame when FITBIKECO started back in 2000 and its 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. This model, in classic Gloss Black, has a 20.75″ toptube.

• 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
• TYRES: FIT OEM 2.4
• BRAKES: U-Brake w/Low Tension Springs, Two Finger Lever, Linear
• MISC: Sealed Front Hub/ Integrated HT New for 2026