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Factor ONE vs Giant Propel Advanced SL
Pick up to 4 bikes. Rows line up component by component. Highlighted rows differ, and green marks the best value where lower or higher is clearly better.
Key differences
- The Giant Propel Advanced SL starts €1,099 cheaper (€12,000 vs €13,099 for the Factor ONE).
- Our verdict scores the Giant Propel Advanced SL higher overall: 75/100 vs 73/100.
- Tire clearance: up to 34 mm on the Factor ONE vs 32 mm on the Giant Propel Advanced SL.
- The Factor ONE comes in 5 sizes, the Giant Propel Advanced SL in 6.
Factor ONE
Giant Propel Advanced SL
| FactorONE | GiantPropel Advanced SL | |
|---|---|---|
| Overview | ||
| Brand | Factor | Giant |
| Build | ONE Shimano Ultegra | Propel Advanced SL 0-Red |
| Build notes | No power meter. The Black Inc HYPER 62 wheel option costs USD 1,100 / EUR 1,199 more. Frame colour, size, crank length and seatpost setback are chosen at order. | EUR price from Giant Germany. Giant Netherlands lists €12,499 and Giant Ireland €12,599. Giant's US site has no new-generation complete Propel Advanced SL. |
| Price (MSRP) | €13,099$11,999€13,099 | €12,000€12,000£10,499 |
| Model year | 2026 | 2027 |
| Generation | ONE (2025) | Fourth-generation Propel (2026) |
| Launched | 2025-12 | 2026-03 |
| Discipline | Aero road | Aero road |
| UCI legal | Yes | Yes |
| Verdict (out of 100) | ||
| Overall score | 73 | 75 |
| Aero | 95 | 93 |
| Frame | 90 | 92 |
| Components | 90 | 92 |
| Fit | 72 | 72 |
| Practicality | 60 | 60 |
| Price | 33 | 43 |
| Frame & fork | ||
| Frame material | Carbon (TeXtreme, Toray and Nippon Graphite pitch-based fibre) | Carbon (Advanced SL-grade composite, one-piece front triangle) |
| Fork material | Carbon; ONE wide-stance bayonet fork | Carbon (Advanced SL-grade composite, full-composite D-shaped OverDrive Aero steerer) |
| Frame weight | — | 800 g28.2 oz |
| Fork weight | — | 360 g12.7 oz |
| Frameset weight | — | 1,443 g3.18 lb |
| Weight measured on | — | Giant's figures for a size M unpainted production frame and fork; the frameset total adds the integrated-seatpost clamp, derailleur hangers, expander, top cap, spacers and headset bearings |
| Frame sizes | 47, 52, 54, 56, 58 | XS, S, M, M/L, L, XL |
| Colours | Onyx Black, Nimbus Grey, Silverstone, Blush, Chrome | Superspeed Blue (SL 0-Red), Prism Pearl (SL 0-DA), Cyber Sunset (frameset) |
| Also available as | ONE SP: the same frame with the ONE SP time-trial/triathlon bar | Propel Advanced Pro and Propel Advanced: lower-grade carbon frames with a telescoping aero seatpost |
| UCI frame approval | Approved 30 May 2025 as 'ONE / FM310' (frame and fork), sizes 47 - 58 (5), code FACTOR-006 (UCI list version 2026.10.02) | — |
| Compatibility & standards | ||
| Brake type | Disc, max rotor 160 mm front and rear | Hydraulic disc |
| Max rotor size | 160 mm | — |
| Wheel size | 700c | 700c |
| Max tire width | 34 mm | 32 mm |
| Bottom bracket standard | T47A (CeramicSpeed T47A aluminium cups; bearings for DUB or 24 mm spindles) | Press-fit |
| Front axle | 12x100 thru-axle | 12x100 thru-axle |
| Rear axle | 12x142 thru-axle | 12x142 thru-axle |
| Drivetrain compatibility | Electronic only (SRAM, Shimano, Campagnolo), 1x or 2x, max chainring 54T | — |
| Mechanical shifting possible | No | — |
| 1x compatible | Yes | — |
| Max chainring | 54T | — |
| Front derailleur mount | Adjustable front derailleur mount | — |
| Cable routing | Internal | Fully internal through the one-piece bar/stem, the D-shaped steerer and the frame |
| Hydration & storage | ||
| Bottle mounts | 2 | — |
| Bottle mount locations | Black Inc aero integrated bottle cages included | Down tube and seat tube, with Giant's tube-specific aero bottle cages |
| Fit & adjustability | ||
| Cockpit | One-piece Factor integrated barstem; the bar mount is separated from the steering axis so long reach doesn't need a long stem | One-piece bar and stem (Giant Contact SLR 0 Aero Integrated) |
| Seatpost type | ONE aero seatpost, 0 or 30 mm setback; adjustable head gives a 73.5-77° seat angle range; takes 7x7 and 7x9 rails | Integrated seatpost (Vector), -5/+15 mm saddle offset |
| Saddle position range | — | -5 to +15 mm offset |
| Fit notes | The barstem comes only 380 mm wide, with 80 mm reach and 120 mm drop, in five lengths (sizes 1-5, equal to 110-150 mm stems) and three high-rise versions with 20 mm more stack. Up to 15 mm of spacers fit, giving 35 mm of shifter-height range in all. Factor says the steep nominal seat angle still gives the same effective fit as the OSTRO VAM, and that every size has the same steering geometry, which avoids toe overlap on small frames. | — |
| Aerodynamics | ||
| Manufacturer aero claims | More than 8% faster than the OSTRO VAM, with the advantage sustained from 0 to 15° yaw (Factor) | 18.44 W less total resistance at 40 km/h than the previous Propel Advanced SL (complete bike, size M, -20 to +20 degrees yaw; aero drag, wheel rotation and tyre rolling resistance combined) |
| Testing method | CFD iterations followed by wind-tunnel testing against a 3D-printed drop-bar HANZŌ ('HANZO Road') reference | CFD and wind-tunnel testing with Giant's Grischa 2.0 dynamic mannequin with articulating legs |
| Tube profile | Wide-stance bayonet fork with a chin fairing that manages the air spilling off the front wheel | Truncated ellipse tubing (AeroSystem Shaping) |
| Travel, maintenance & warranty | ||
| Headset bearings | 1-1/8 in upper and lower bearings | — |
| Derailleur hanger | Factor Mini-UDH | UDH |
| Proprietary parts | Integrated barstem, bayonet fork and chin fairing, ONE seatpost, Mini-UDH hanger, location-specific bottle cages | Integrated seatpost, one-piece bar/stem, D-shaped steerer and spacers |
| Frame warranty | Limited lifetime warranty | — |
| Sold via | Direct from factorbikes.com and through retailers | — |
| Drivetrain | ||
| Groupset | Shimano Ultegra Di2 R8100 | SRAM Red AXS E1 |
| Launched | 2021 · current generation | 2024 · current generation |
| Speeds | 12-speed | 12-speed |
| Electronic | Yes | Yes |
| Drivetrain | 2x | 2x |
| Shifters | — | SRAM Red AXS E1 HRD |
| Crankset | Shimano Ultegra R8100 | SRAM Red AXS E1 Power Meter |
| Chainrings | 52/36 | 50/37 |
| Crank length | 165 / 170 / 172.5 (chosen at order) | 165 (XS, S) / 170 (M, M/L) / 172.5 (L, XL) |
| Power meter | — | SRAM Red AXS E1 Power Meter |
| Launched | — | 2024 · current generation |
| Bottom bracket | — | SRAM DUB Ceramic |
| Standard | — | Press-fit |
| Bearings | — | Ceramic |
| Front derailleur | — | SRAM Red AXS E1 |
| Rear derailleur | — | SRAM Red AXS E1 |
| Cassette | Shimano Ultegra R8100 | SRAM Red XG-1290 E1 |
| Range | 11-34 | 10-33 |
| Speeds | 12-speed | 12-speed |
| Chain | — | SRAM Red E1 |
| Brakes | ||
| Brake levers | — | SRAM Red AXS E1 HRD |
| Brake calipers | — | SRAM Red |
| Type | — | Hydraulic disc |
| Rotors | 160/140 mm rotors | SRAM Paceline X |
| Front rotor | 160 mm | 160 mm |
| Rear rotor | 140 mm | 140 mm |
| Wheels & tires | ||
| Wheelset | Black Inc SIXTY TWO | CADEX Max 50 WheelSystem |
| Front rim depth | 62 mm | 50 mm |
| Rear rim depth | 62 mm | 50 mm |
| Material | Carbon | Carbon |
| Hubs | — | CADEX R3 Aero (front), CADEX R3-C48 Aero with 48T ratchet driver (rear), Center Lock, 12 mm thru-axles |
| Spokes | — | CADEX Super Aero Carbon |
| Notes | Black Inc HYPER 62 available at extra cost | — |
| Tires | — | CADEX Aero |
| Tire width | — | 28 mm |
| Set up tubeless | — | Yes |
| Cockpit | ||
| Handlebar | Factor ONE Integrated Barstem | Giant Contact SLR 0 Aero Integrated |
| Type | One-piece bar and stem | One-piece bar and stem |
| Integrated stem | Yes | Yes |
| Bar width | 380 mm | — |
| Widths available | 380 mm only | 380/360 mm (XS, S), 400/370 mm (M, M/L), 420/390 mm (L, XL), drops/hoods; integrated stem 80 (XS), 90 (S), 100 (M), 110 (M/L, L), 120 mm (XL) |
| Bar reach | 80 mm | — |
| Bar drop | 120 mm | — |
| Tops | — | Aero (flat tops) |
| Cable routing | — | Internal |
| Material | — | Carbon |
| Notes | Five lengths (1-5, equivalent to 110-150 mm stems) and three high-rise versions (1H-3H) with 20 mm more stack, chosen at order | — |
| Saddle & seatpost | ||
| Saddle | — | CADEX AMP |
| Seatpost | Factor ONE Seatpost | Giant Vector integrated seatpost |
| Offset / setback | 0 mm or 30 mm setback, chosen at order | -5/+15 mm |
| Material | Carbon | Carbon (Advanced SL-grade composite) |
| Bar tape | — | Giant Stratus Lite 2.0 |
| Included extras | ||
| Bottle cages | Black Inc Aero Integrated Bottle Cages | — |
| Geometry (smallest – largest size) | ||
| Sizes | 47, 52, 54, 56, 58 | XS, S, M, M/L, L, XL |
| Rider height min | — | 157–189 cm5–6′2″ |
| Rider height max | — | 169–199 cm5′7″–6′6″ |
| Stack | 503–587 mm19.8–23.1″ | 515–596 mm20.3–23.5″ |
| Reach | 390–421 mm15.4–16.6″ | 377–412 mm14.8–16.2″ |
| Seat tube angle | 75.5–76.5° | 72.5–74.5° |
| Head tube angle | 72.5–73.3° | 71.5–73° |
| Head tube length | — | 115–200 mm4.5–7.9″ |
| Effective top tube | — | 520–600 mm20.5–23.6″ |
| Chainstay | 405–408 mm15.9–16.1″ | 405 mm15.9″ |
| Wheelbase | 974–1,022 mm38.3–40.2″ | 971–1,020 mm38.2–40.2″ |
| BB drop | 75–77 mm3–3″ | 67–72 mm2.6–2.8″ |
| Fork offset | 43–48 mm1.7–1.9″ | 45 mm1.8″ |
| Trail | 57.4–58 mm2.3–2.3″ | 58.3–67.8 mm2.3–2.7″ |
| Standover | — | 746–847 mm29.4–33.3″ |
| Wheel size | 700c | 700c |
| Crank length | — | 165–172.5 mm6.5–6.8″ |
| Stem length | — | 80–120 mm3.1–4.7″ |
| Handlebar width | — | 380–420 mm15–16.5″ |
Geometry overlay
Pick a size for each bike to see frames and arm-pad ranges on top of each other.
Drawn to scale (how to read it).