LS
The Factor LS is a dedicated gravel racing platform built for riders who prioritize speed and efficiency over bikepacking utility or plush comfort. Introduced in 2020, it draws heavily from Factor’s lightweight road heritage, resulting in a sub-kilogram carbon frame that looks and behaves much like a modern tarmac bike. Rather than chasing the trend of ultra-wide tire clearance and suspension elements, the LS remains a minimalist machine optimized for fast, mixed-surface riding. It accommodates tires in the 40mm to 43mm range and relies on a conventional 27.2mm round seatpost for seated compliance. While it includes provisions for three bottles and a top-tube bag, its core identity is strictly performance-oriented. This is a bike designed for competitive gravel events, fast group rides on dirt roads, and riders who want their off-pavement experience to feel as direct and responsive as a lightweight road racer.
| Stack | 530mm |
| Reach | 372mm |
| Standover height | 748mm |
| Seat tube length | 455mm |
Fit and geometry
The geometry of the Factor LS leans heavily toward the aggressive end of the gravel spectrum, mirroring the fit and handling characteristics of an endurance road bike. With a relatively steep head tube angle—measuring 72.3 degrees in the larger sizes—and a tight 420mm chainstay length, the chassis prioritizes quick steering and agility. This compact footprint keeps the bike nimble through tight corners, though it does introduce noticeable toe overlap on smaller frames when running 40mm tires.
Rider posture is decidedly sporty. The stack and reach figures encourage a low, aerodynamic position suitable for racing, though the front end is slightly taller than a pure road climbing bike. Handling is further defined by a low bottom bracket with 76mm of drop, which helps anchor the bike and provides stability to counter the fast steering. Across the build range, the LS utilizes a Black Inc integrated carbon bar and stem. This one-piece cockpit locks riders into a fixed handlebar geometry, though it features a flattened top section designed to introduce a small degree of flex to help mute high-frequency vibrations at the hands.
Builds
The Factor LS build ladder is concise, offering three premium electronic configurations that cater to slightly different mixed-surface applications. Every model shares the same lightweight carbon frameset, a T47A threaded bottom bracket, and a Black Inc Thirty Four carbon wheelset, establishing a high baseline for performance and value.
The lineup splits primarily by drivetrain philosophy. The Shimano Ultegra build is distinctly road-oriented, featuring a 2x12 setup with a 52/36T crankset and an 11-34T cassette. This configuration is ideal for riders using the LS as an all-road machine where high top-end speed on pavement is a priority. Moving to the SRAM options, the Force with Power Meter build provides a more versatile 2x12 all-road gearing spread, utilizing 48/35T chainrings paired with a 10-33T cassette. For dedicated gravel use, the SRAM Force XPLR build shifts to a 1x12 system with a 44T chainring and a wide 10-44T cassette, simplifying shifting and improving chain retention over rough ground. Both SRAM builds include integrated power meters, adding significant training value for competitive riders. Notably, none of the builds include a seatpost or saddle, leaving those final contact points to the rider's preference.
Reviews
Critics consistently frame the Factor LS as a highly efficient, road-adjacent machine that excels on smooth dirt but demands careful handling on rougher trails. Testers praise its immediate power transfer and climbing prowess, noting that the chassis rewards hard efforts. Cycling News describes the bike as an "exceptionally stiff machine" (Cycling News) that feels incredibly fast and reactive when accelerating out of corners or tackling steep gradients. On well-maintained gravel and pavement, the bike maintains momentum beautifully, with reviewers highlighting a "controlled feel" (Velo) that allows it to glide over mild imperfections.
However, reviewers agree that this rigid, race-bred construction comes with distinct compromises in comfort. Without suspension elements or massive tire clearance, the frame transmits significant feedback on rocky or corrugated surfaces. Cycling News found the ride quality to be "unapologetically jarring" (Cycling News) on choppy singletrack, suggesting it is better suited for competitive efforts than leisurely exploration. Additionally, testers pointed out that the quick handling can feel skittish on steep, loose descents, and the minimalist carbon frame lacks robust external protection against rock strikes. Ultimately, reviewers view the LS as a specialized tool for riders who value tactile feedback and outright speed over all-day bump absorption.
