AI quick summary
- Factor is an Australian- founded, UK-based engineering boutique — founded by Chris Roberts (former BF1 Systems / Aston Martin One-77 engineer). Factor builds low-volume, engineering-first bikes: every model is designed around a specific problem, not a market segment. Now owned by Visma-Lease a Bike's parent group (2024)
- Road hierarchy: Ostro VAM (all-around race, the flagship) → O2 VAM (lightweight climbing) → LS (endurance) → ONE (aero, previous-gen). The Ostro VAM is the bike of Israel-Premier Tech and Visma-Lease a Bike
- Gravel: LS gravel (the LS is a do-it-all platform with road and gravel variants). Factor has no dedicated adventure gravel bike — the LS is race/endurance only
- Engineering-first design: Factor uses its own wind tunnel (the BSTN facility) and publishes aero data for every model. The Ostro VAM is one of the few aero road bikes that's also under 800 g — the 'lightest aero' claim
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Road — Ostro VAM, O2 VAM, LS, ONE
Ostro VAM: Factor's flagship, the bike of Israel-Premier Tech and (since 2024) Visma-Lease a Bike. The Ostro is unique: it's an aero bike (low drag, deep tube shapes) AND a lightweight bike (820 g frame). Most aero bikes are 950+ g; most lightweight bikes aren't aero. The Ostro VAM is the 'one bike that does both' — Factor's published wind-tunnel data shows it has the lowest drag-to-weight ratio of any production road frame. 'VAM' is Factor's lightweight variant code.
O2 VAM: Factor's pure climbing bike, ≈690 g frameset, round tube shapes, no aero optimization. The O2 VAM is for riders who prioritize weight above all — mountain stages, climbing events. It's the direct competitor to the Trek Émonda and Cervélo R5.
LS: Factor's do-it-all platform. Available as a road endurance build (32 mm clearance) or a gravel build (35 mm clearance) on the same frame. The LS is the value Factor — same engineering, heavier layup, round cockpit (adjustable stem).
ONE: Factor's previous-gen flagship aero bike (pre-Ostro). Still sold at a discount while supplies last. The ONE was Factor's first aero road frame; the Ostro replaced it in 2021.
Factor road family. 'VAM' = Factor's lightweight variant of a platform. Ostro = aero+lightweight hybrid.
| Model | Category | Frame weight | Key feature | Tire clearance | Starting price |
|---|---|---|---|---|---|
| Ostro VAM | All-around race (aero + light) | ≈820 g (size 54) | Lowest-drag frame under 850 g; the 'lightest aero' | 32 mm | ≈$10,000 (Red AXS) |
| O2 VAM | Lightweight climbing | ≈690 g (size 54) | Round tubes, no aero; pure climbing bike | 32 mm | ≈$9,000 (Red AXS) |
| LS (road) | Endurance | ≈910 g (size 54) | Endurance geo, 32 mm clearance, compliance seatpost | 32 mm | ≈$5,500 (Ultegra Di2) |
| LS (gravel) | Gravel | ≈950 g (size 54) | Same LS frame, gravel build, 35 mm clearance | 35 mm | ≈$5,000 (Force AXS XPLR) |
| ONE | Aero (previous-gen) | ≈950 g (size 54) | Discontinued flagship aero; still sold at discount | 28 mm | ≈$4,500 (105) |
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Gravel — LS gravel
Factor's gravel offering is the LS gravel — the same LS frame built for gravel, with 35 mm tire clearance and a SRAM XPLR or Shimano GRX groupset. There's no dedicated adventure gravel bike (no Factor equivalent of the Specialized Diverge or Canyon Grizl). The LS gravel is a race/endurance gravel bike with road-endurance geometry.
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Factor's engineering-first philosophy
BSTN wind tunnel: Factor uses its own wind tunnel (the BSTN facility, shared with Black Inc wheels). Every Factor model is wind-tunnel-validated, and Factor publishes the drag numbers — rare in an industry where most brands keep aero data proprietary or vague. The Ostro VAM's published drag data is the basis of its 'lightest aero' claim.
Black Inc: Factor's sister brand (same ownership), making wheels, bars, stems, and cranksets. Factor bikes ship with Black Inc components — the integrated cockpit on the Ostro VAM is Black Inc, as are the deep-section wheels. Black Inc is the Factor equivalent of Roval (Specialized) or Cadex (Giant).
T47 bottom bracket: Factor uses the T47 threaded standard (a threaded, oversized BB) on the Ostro VAM and O2 VAM. T47 is creak-free and serviceable — Factor avoided press-fit BBs entirely, a choice that endears them to mechanics and riders who hate press-fit creaks.
Low-volume production: Factor builds fewer bikes than the major brands. The implication: tighter quality control and more engineering attention per model, but less availability and longer lead times on popular sizes. Factor is the bike for riders who want something that isn't a Trek/Specialized/Giant.
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