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Gravel Complete Bicycles

Factor LS Gravel GRX Complete Bicycle

The exciting LS Gravel is Factor's true leap into the gravel race zone with the desire to build a lightweight frameset with perfectly balanced geometry, stiffness to deliver voracious acceleration and climbing performance, while diverging from more of the do-it-all options and quasi-race designs. The balance of comfort and performance being crucial to gravel success, LS offers the correct stiffness for aggressive riding on harsh terrain to break free from the pack without beating on the rider. The LS has been optimized around 40-43 mm tires (43 max). We built a size run of well-equipped Shimano GRX-815/810 Di2 complete bikes for those who prize speed and podiums over satisfaction of a long grind.

Each size of the LS Gravel has its own specific lay-up and definitive tube sizes. Factor has mastered the processes of Computer Fluid Dynamics (CFD) and frame laminate design with it's Fibersim optimization program, using the only the absolutely necessary types and amounts of carbon fiber and resin for each frame. Each LS is built with Factor's EM2 RGicarbon system, employs various amounts of three carbon fiber types: Standard Modulus, Medium Modulus, and the costly and difficult to work with High Modulus Pitch Fiber. Each is applied to it's greatest effect, in accordance with the desired properties of each frame section or tube. Due to the challenges and costs, Pitch fiber is rarely used except at the top-end of the bike world. Factor knows the process and material well, and uses Pitch fiber to it's greatest effect. That exacting process, zero waste, highly informed engineering, and optimal materials combine to deliver a 950 gram gravel race frame that responds like nothing else.

Avoiding trade-offs associated with accommodating the larger tire sizes needed by gravel racers, the geometry of the LS is optimized to ensure exceptionally reactive handling. A 420mm chainstay length is the sweet spot for gravel race bikes, and Factor has managed this while keeping more road-style seattube angles per size. The fork trail varies slightly by size but is between 59-61mm, with all sizes utilizing a 50mm fork offset Headtube angles are only slightly slacker than road norms. The slight triangle cut out offers more space in the rear for the tires, while the frameset itself maintains the O2 style sloping toptube. A 76mm BB drop reflects the added height of the tires. Conceptually, the downtube has a little more curve off the headtube, increasing the clearance there. The end result is a quicker handling bike that retains some stability, but reflects the true race nature of the LS Gravel Frameset design.

Many other frame features that Factor believes strongly in have moved from the O2 to the LS. You'll find the asymmetric bottom bracket system and vertically oversized chainstays. Their pencil shaped chainstays- so effective at mitigating frame buzz from the rear dropouts, have a kinked design that accommodates the tire size, and adds a bit more lateral stiffness along with vertical compliance. The sleek 1-1/8" - 1-3/8" tapered fork is specific to the LS, with a wider crown to leg transition and more clearance from axle to crown (395mm) without adding much overall fork/headtube height- again the racer's preference. On the rear dropouts, just above and behind the axle, hidden lower fender mounts have been added for those times you need one. Along with the inner triangle down and seat tube bottle cage bosses, a third was added under the downtube-. A set of toptube Bento-box style bosses sit behind the headtube.

As expected the disc brake frameset features the Flat Mount standard for the disc calipers (140-160mm rotors), 12/100mm front and 12/142mm rear threaded thru-axles, an integrated chainsuck guard, removable braze-on style front derailleur mount, Factor's hidden and reliable integrated seatpost fastening wedge system for a 27.2mm diameter round seatpost. A standard headset for the tapered fork/headtube is included, as are the thru-axles, and replaceable rear dropout. The frame can accommodate several types of slim/sleek strap-down bike bags for long, isolated events or rides without feeling unbalanced.

The LS Gravel delivers a gravel racing experience road racers will gravitate to. Even some of the best gravel race options tend to feel too stable, without the handling capabilities desired by many. There is a balance needed there, and for Factor they came down on the more reactive side without going too far. It becomes easier to track in straight lines off the rear wheel, while allowing the front to lift and ride over loose or rocky material. Plus, when the track is smoother, or you hit pavement, the LS will handle more like a road bike.

The complete build spec is listed below, but the full GRX-815/810 Di2 set-up is top notch- we even added the Bluetooth transmitter, complemented by Black Inc's Carbon Integrated Bar-Stem; and the bike is carried by 3T's Discus 45|32 carbon wheelset on 700x38 Panaracer Gravel King SK tubeless tires.


  • Race-grade Gravel frame design by carbon experts; bike build by Excel Sports with GRX-815/810 Di2
  • Geometry more similar to road designs, optimized for 40-43mm tires and responsive acceleration
  • Slight seattube cutout/downtube curving off headtube afford more tire clearance w/o adding overall length
  • Shorter seatstays, refined steering trail allow racers the ability to react and take advantage
  • Carbon construction with three distinct materials and design specific lay-up/resin use
  • Sloping design that exposes more of a 27.2 round seatpost and kinked pencil stays add comfort
  • Tapered headtube/carbon fork steerer (1&frac18" - 1⅜") and headset
  • Seatpost wedge system is hidden- under TT/ST junction, uses effective, integrated wedge (see torque spec)
  • Asymmetric BB junction for maximum stiffness (79mm PF or Thread Together BBright)
  • Internal routing for mechanical & electric shifting for 1x or 2x drivetrains with hydraulic disc brakes
  • 12/100mm fork and 12/142mm rear threaded thru-axles; Flat Mount disc (140-160mm rotor)
  • Requires: braze-on type front derailleur, 27.2mm seatpost (350+ mm depending on size/fit)
  • Replaceable rear derailleur, removable FD tab for 1x use, hidden lower fender mounts
  • TT bento box mount and three options for bottle cages (inner triangle DT/ST, under DT)
  • Sleek strap-style frame bag compatibility
  • Shimano 11s GRX-815 Di2: Dual Control levers w/hydraulic GRX-810 FM disc calipers, FD, RD (GS)
  • Di2 eTube wiring, with internal seatpost battery, BLE transmitter, EW-RS910 Junction Box (bar-end)
  • GRX-810 2x crankset 48-31, CN701 chain, HG800 11-34 cassette, RT90 140mm Center Lock Rotors, Wheels Mfg BBright Direct Fit BB
  • 3T Discus 45|32 disc brake wheelset w/Panaracer Gravel King SK Tubeless 700x38 tires, with tubes
  • Ritchey WCS 1-bolt Alloy seatpost, 25mm SB, San Marco Mantra Full Fit Saddle/ Xsilite rails/ 136mm width
  • Black Inc Carbon Integrated Bar/Stem w/ Lizard Skins DSP 2.5mm Bar tape, Jet Black
  • Component specifics by frame size:
    • 49cm Bar: 38c-c, Stem: 90mm, Crank: 170mm
    • 52cm Bar: 40c-c, Stem: 100mm, Crank: 172.5mm
    • 54cm Bar: 42c-c, Stem: 110mm, Crank: 172.5mm
    • 56cm Bar: 42c-c, Stem: 110mm, Crank: 175mm
  • Sizes: 49, 52, 54, 56 cm
  • Finish: UD Carbon/Grey w/clear coat
  • Weight: 18.03 lbs (54cm, Frame 957 grams / 54cm bare )
Factor LS Gravel
Size 49cm 52cm 54cm 56cm 58cm
Wheel Size 700 700 700 700 700
Stack 530mm 547mm 566mm 585mm 605mm
Reach 372mm 378mm 383mm 392mm 401mm
Head Angle 71.5° 71.9° 72.3° 72.3° 72.3°
Seat Angle 74.5° 74° 73.5° 73.5° 73.5°
Top Tube Length 519mm 535mm 550mm 566mm 580mm
Standover 748mm 772mm 789mm 809mm 831mm
Fork Trail 60-61mm 60-61mm 59-60mm 49-60mm 59-60mm
Fork Offset 50mm 50mm 50mm 50mm 50mm
Bottom Bracket Drop 76mm 76mm 76mm 76mm 76mm
Front Center 582mm 589mm 597mm 612mm 627mm
Wheelbase 990mm 998mm 1005mm 1020mm 1035mm
Chainstay Length 420mm 420mm 420mm 420mm 420mm