The Series One was our first frame when we started FIT back in 2000 and it’s our most popular bike to date. For 2026 we’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.
Features:
- Frame: Cro-Mo Front Tri
- Geometry: Series One 20.5” Top Tube
- Headset: Integrated W/gyro Holes
- BB: Mid Sealed
- Bars: 2-piece 8.7”x 2
- Fork: Cro-mo Steerer, 33mm Offset, Welded Insert
- Stem: Fit Top Load
- Seat: More Padded Integrated Combo, 200mm Post
- Cranks: Tubular Cro-mo 165mm
- 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