Revolutionary Evolution
The ONE is not a revolution pulled from thin air; it is the evolution of everything we’ve learned in recent years. From the Olympic-record-breaking HANZŌ Track to the all-conquering OSTRO VAM, each project has added layers of knowledge. We’ve amassed a deep understanding of form and shapes, fusing CFD, wind tunnel, and real world knowledge. How to manipulate turbulence around a spinning wheel, how to extract more speed without sacrificing stability. When the UCI relaxed key design regulations, we were ready. We pushed to the very edge of what is now possible, not only aerodynamically, but in rider fit and handling. In its first public appearance, unannounced, in prototype form, the ONE won a stage of the Critérium du Dauphiné. It was not a debut. It was a declaration.

Cockpit redefined
The ONE uses an integrated bar system without a traditional stem. Sizes are designated 1, 2, 3, 4, 5, corresponding to stem equivalents of 110 through 150 mm with three high rise options offering an additional 20mm of stack.

Bar adjustability
Up to 15 mm of spacers can be added per bike. When combined with the selection of the high- and low-rise bar, this gives riders 35 mm of shifter stack height range.

CHOOSING YOUR ONE HANDLEBAR
Selecting the right fit for your new Factor ONE is simple. We've designed a new system that removes traditional stem lengths to give you a clean, integrated setup.

A Simple Guide to Your Fit
The easiest way to find your size is to match it to your current OSTRO VAM or OSTRO Gravel setup. Here’s how:

Frame: Choose the same frame size you normally ride.

Seatpost: Select the ONE Setback seatpost (this replaces the OSTRO Zero Setback post).

Stem: Pick the stem number that matches the stem length you use on an OSTRO: 110mm = 1, 120mm = 2, 130mm = 3, 140mm = 4, 150mm = 5. The 20mm longer reach of the ONE is already factored into this calculation.

Handlebar Options
Low Bar: Our standard, aggressive-position bar. Available in sizes: 1, 2, 3, 4, 5.

High Bar: This option directly mimics the hand position of an OSTRO VAM using a 20mm rise in the bars curvature. It is available in sizes 1, 2, and 3 only: 1H, 2H, 3H

Both Low and High handlebar styles can be adjusted with up to 15mm of spacers.