Factor O2 VAM Headset and Barstem: Bearings, Reach and Spacer Scope
Factor O2 VAM headset numbers describe more than one interface. The current page lists bearing sizes, head-tube dimensions and a separate Black Inc barstem reach and drop. The 2023 manual’s spacer warning adds another limit. Keeping those roles separate prevents a bearing description from becoming a guessed cockpit or height specification.
Factor O2 VAM headset bearings and head-tube entries
The specification names CeramicSpeed SLT bearings in 1-1/8-inch and 1-3/8-inch sizes. Its Head Tube Diameter row separately identifies upper 1-1/8-inch and lower 1-3/8-inch. Factor O2 VAM bearing sizes should retain those upper and lower distinctions; neither entry is the length of the stem or the width of the handlebar.
The Factor O2 VAM barstem row names the Black Inc Integrated Barstem with 80mm reach and 120mm drop. It says multiple stem lengths and bar widths are available, without identifying a single universal length-and-width combination. Factor O2 VAM handlebar reach here concerns that cockpit entry, not the chassis reach row in the geometry chart.
Read the spacer limit with the cover included
The 2023 steerer warning limits the supplied spacers to 40mm including the tall headset cover. Factor O2 VAM headset spacers must therefore not be described as 40mm added above any chosen cover. Retain the supplied-parts scope and included-cover wording whenever asking the shop about the arrangement.
The same manual’s Top bearing section calls for a shape-matching spacer when the Black Inc HB01 non-aero is used. That named condition is another reason a headset purchase cannot be selected from the two bearing dimensions alone. This guide does not explain steerer cutting, disassembly or changing the riding position.
Ask for the actual cockpit and frame combination
The catalogue package can anchor the enquiry, while the manufacturer records supply only their stated general interfaces. The catalogue listing is Factor O2 VAM - SRAM Force w/ Power Meter Bike — Chrome.
Record the frame generation, fitted cockpit and cover before requesting a replacement or height assessment. A number copied from the bearing row cannot establish arbitrary barstem compatibility. Likewise, the historical photograph’s visible cockpit is not evidence of the current package’s dimensions or permitted spacer arrangement. Find the wider bicycle context in the Factor family introduction and retain the Factor topic as the starting point for separate cockpit questions.
FAQ
Is the 80mm barstem reach the frame reach?
No. Those are separate dimensions with different reference points.
Does the manual allow 40mm above the tall cover?
No. Its stated 40mm includes that cover.
Do two bearing diameters identify the complete cockpit?
No. The applicable bearing, cover, spacer and cockpit arrangement still needs confirmation.
Sources
Manufacturer model specification (https://factorbikes.com/bikes/o2-vam) (read 5 November 2026).
O2 VAM v2 manual, cover dated 2023 (https://assets.ctfassets.net/uyc32o2uod42/4tilfMcqAd3aG2yvddQd2f/f84ba94ebf86b407a4d13200fac80c9e/New_O2_VAM__2023_.pdf) (read 5 November 2026).
Photograph credits and permissions
Photograph 1
Original title: Factor O2 VAM Disc
Creator: Glory Cycles; creator URI: https://www.flickr.com/photos/glorycycles/
Original source URI: https://www.flickr.com/photos/glorycycles/48745876337/
License / permission: CC BY 2.0 Generic
License / permission URI: https://creativecommons.org/licenses/by/2.0/
Modification notice: Original downloaded JPEG bytes retained without crop, recompression or colour edits. EXIF and XMP retained, including embedded Artist/creator value Picasa and the supplied modification metadata. Earlier source processing is unassessed.
Source disclaimer: Historical source-identified Factor O2 VAM Disc, with externally visible cables and a conventional seatpost. Photograph/upload dates do not establish bicycle production year. Related model history only: not the current v2 external-seatmast design, the linked Chrome SRAM Force package, or proof of current specifications, fit, condition or compatibility. No endorsement or warranty is implied; other rights may apply.