Avail May 2025 – Pre-Order Now!

The Series One was our first frame when we started FIT back in 2000 and its our most popular bike to date. For 2026 weve 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.

20.5 Top Tube

Bars: 2-Piece 8.7 X 29

Cranks: 165mm

SERIES ONE (20.5 TT)

FRAME: Cro-Mo Front Tri

GEOMETRY: SERIES ONE

HEADSET: Integrated w/Gyro Holes

BB: Mid Sealed

BARS: 2-Piece 8.7x 29

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