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The Series One was FIT's first frame when they 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 lengths with corresponding handlebar and crank sizes.
SERIES ONE (20.75 TT)
FRAME: Cro-Mo Front Tri
GEOMETRY: SERIES ONE
HEADSET: Integrated w/Gyro Holes
BB: Mid Sealed
BARS: 2-Piece 9”x 29”
FORK: Cro-Mo Steerer, 33mm Offset, Welded Insert
STEM: FIT Top Load
SEAT: More Padded Integrated Combo w/ 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 Cable
MISC: Sealed Front Hub/ Integrated HT New for 2026