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Aurum Magma vs Factor OSTRO VAM
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 Aurum Magma starts €3,100 cheaper (€8,299 vs €11,399 for the Factor OSTRO VAM).
- Our verdict scores the Aurum Magma higher overall: 78/100 vs 77/100.
- Tire clearance: up to 35 mm on the Aurum Magma vs 32 mm on the Factor OSTRO VAM.
- The Aurum Magma comes in 5 sizes, the Factor OSTRO VAM in 7.
Aurum Magma
Factor OSTRO VAM
| AurumMagma | FactorOSTRO VAM | |
|---|---|---|
| Overview | ||
| Brand | Aurum | Factor |
| Build | Magma Ultegra Di2 / Scope R-series | OSTRO VAM SRAM Red w/ Power Meter |
| Build notes | AURUM lists the Ultegra parts by group name only, without model codes. No power meter. EUR price as AURUM's online configurator totals it (Spain selected), in any of the four standard colours; the KALEIDOS custom paint adds €550 and a second bottle and cage €47. | Barstem width and stem length, crank length, seatpost setback, frame colour and wheel decal colour are chosen at order. Prisma custom paint costs USD 600 extra. |
| Price (MSRP) | €8,299€8,299€8,299 | €13,699$12,599€13,699 |
| Model year | 2026 | 2024 |
| Generation | Magma V2 (2nd generation) | 2nd generation |
| Launched | 2024-05 | 2024-02 |
| Discipline | Aero road | Aero road |
| UCI legal | Yes | Not stated |
| Verdict (out of 100) | ||
| Overall score | 78 | 77 |
| Aero | 80 | 84 |
| Frame | 88 | 92 |
| Components | 82 | 90 |
| Fit | 84 | 86 |
| Practicality | 68 | 66 |
| Price | 65 | 44 |
| Frame & fork | ||
| Frame material | Carbon (AURUM ECT-10 laminate: six types of carbon fibre with a size-specific layup) | Carbon (TeXtreme, Toray and Nippon Graphite pitch-based fibre) |
| Fork material | Carbon (AURUM ECT-10, wide-stance crown, standard 28.6 mm steerer) | Carbon; OSTRO wide-stance fork |
| Frame weight | 780 g27.5 oz | 820 g28.9 oz |
| Fork weight | 375 g13.2 oz | — |
| Weight measured on | AURUM claim, size 54 (Cyclingnews quotes it as unpainted) | Size 54, painted (Factor launch press release); Factor's current spec sheet lists 900 g |
| Frame sizes | 48, 51, 54, 56, 58 | 45, 49, 52, 54, 56, 58, 61 |
| Colours | Carbon Gloss, Red Team, Arctic White, Tenerife (complete bikes); KALEIDOS custom paint | Icon Blue, Geometric, White Chrome, Gloss Chrome, Black, Arctic Chrome, Terracotta Orange; custom Prisma paint at extra cost |
| Also available as | Magma Tenerife limited edition; the cheaper ESSENTIA in ECT-9 carbon with the same geometry | — |
| UCI frame approval | Approved 15 Feb 2024 as 'MAGMA V2' (frame and fork), sizes 48 - 58 (6), code AURUM-MG (UCI list version 2026.10.02); AURUM also states it is UCI approved | — |
| Compatibility & standards | ||
| Brake type | Hydraulic disc, flat mount only | Disc, max rotor 160 mm front and rear |
| Max rotor size | — | 160 mm |
| Wheel size | 700c | 700c |
| Max tire width | 35 mm | 32 mm |
| Bottom bracket standard | T47 threaded | T47A (CeramicSpeed T47A aluminium cups; bearings for DUB, 24 mm or Ultra-Torque spindles) |
| Front axle | 12 mm thru-axle (AURUM CNC 'stealth' ultralight) | 12x100 thru-axle |
| Rear axle | 12 mm thru-axle (AURUM CNC 'stealth' ultralight) | 12x142 thru-axle |
| Drivetrain compatibility | Electronic groupsets only | Electronic only, max chainring 54T |
| Mechanical shifting possible | No | No |
| Max chainring | — | 54T |
| Cable routing | Fully internal through the AURUM integrated handlebar | Internal |
| Electronic battery location | — | Inside the seat tube, fitted from behind the bottom bracket (no need to remove the seatpost) |
| Hydration & storage | ||
| Bottle mounts | — | 2 |
| Bottle mount locations | — | Down tube and seat tube, with location-specific Black Inc aero bottle cages included |
| Fit & adjustability | ||
| Cockpit | One-piece AURUM Integrated Handlebar (carbon monocoque) with hidden cable routing, in 15 sizes (38/40/42 cm widths, 90-130 mm stems) | One-piece bar and stem (Black Inc Integrated Aero Barstem) |
| Seatpost type | AURUM MAGMA aero carbon seatpost with hidden wedge clamp, 0 or 20 mm setback | OSTRO VAM aero seatpost, 15 mm wide, 0 or 20 mm setback; pusher-type clamp at the back of the seat tube |
| Fit notes | The bar width (38/40/42 cm), stem length (90-130 mm), crank length and seatpost setback are chosen in the configurator. The bar comes with 5 and 10 mm stack spacers. The two smallest sizes have shorter seat tubes and the fork offset is 50 mm on sizes 48-51 and 44 mm on 54-58. | The barstem is chosen at order in 36, 38, 40 or 42 cm widths and 80 to 140 mm stem lengths (10 mm steps), with 80 mm reach and 120 mm drop; the drops flare by 30 mm. Factor also offers the Integrated Aero Barstem with Extensions (AB03) as an upgrade. Saddle rail clamps take 7x7 and 7x9 rails. A 45 cm size was added and the seat-tube angle is 0.5° steeper than before. |
| Aerodynamics | ||
| Manufacturer aero claims | About 7 W saved at 45 km/h by the new frameset against the original Magma with the same size, wheels and parts, plus about 10 W from the integrated handlebar against a standard two-piece round bar and stem (AURUM CFD estimates) | 70 g less drag (a 7 W saving) than the previous OSTRO VAM frame; Factor says it outperforms its rivals in the wind tunnel |
| Testing method | CFD across -10 to 10 degrees of yaw during design; Cyclingnews reports the design was then checked in the University of Valencia wind tunnel | CFD simulations of dozens of head tube profiles (Rapid Iterative Design), then rapid prototypes verified in the wind tunnel and real-world testing |
| Tube profile | NACA 0024 profile for the head and down tubes, NACA 0021 for the fork, seat tube and seatpost, truncated trailing edges; high seat stays and a flattened top tube | Airfoil-type profile along the frame's waterline; 15 mm wide seatpost shaped for the airflow off the rider's legs |
| Travel, maintenance & warranty | ||
| Headset bearings | Tapered, angular stainless-steel bearings 1.5 in lower and 1-3/8 in upper | 1-1/8 in upper and 1-3/8 in lower bearings |
| Derailleur hanger | UDH (SRAM Universal Derailleur Hanger) | — |
| Maintenance | — | The threaded T47 bottom bracket takes CeramicSpeed bearings. The Di2 battery is reached from behind the bottom bracket rather than through the seatpost, so the saddle height isn't disturbed. |
| Proprietary parts | AURUM integrated handlebar, MAGMA seatpost and hidden wedge clamp, AURUM thru-axles | One-piece Black Inc barstem, OSTRO VAM seatpost and clamp, location-specific bottle cages |
| Frame warranty | 2 years on frame and fork, extended to lifetime when the frame serial number is registered on AURUM's website | Limited lifetime warranty |
| Sold via | Direct online at aurumbikes.com and through AURUM dealers | Direct from factorbikes.com and through retailers |
| Drivetrain | ||
| Groupset | Shimano Ultegra Di2 | SRAM Red eTap AXS |
| Launched | — | 2019 · replaced by SRAM Red AXS E1 (2024) |
| Speeds | 12-speed | 12-speed |
| Electronic | Yes | Yes |
| Wireless | — | Yes |
| Drivetrain | 2x | 2x |
| Shifters | Shimano Ultegra Di2 | — |
| Crankset | Shimano Ultegra Di2 | SRAM Red AXS Power Meter |
| Chainrings | 52/36 | 48/35 |
| Crank length | — | 165 / 170 / 172.5 (chosen at order) |
| Power meter | — | SRAM Red AXS Power Meter |
| Bottom bracket | CeramicSpeed T47 | — |
| Standard | T47 | — |
| Front derailleur | Shimano Ultegra Di2 | — |
| Rear derailleur | Shimano Ultegra Di2 | — |
| Cassette | Shimano Ultegra Di2 | SRAM Red AXS |
| Range | 11-30 | 10-33 |
| Speeds | 12-speed | 12-speed |
| Chain | Shimano Ultegra | — |
| Brakes | ||
| Brake calipers | Shimano Ultegra Di2 hydraulic disc | — |
| Type | Hydraulic disc | — |
| Rotors | Shimano Ultegra | 160 mm rotors |
| Front rotor | 160 mm | 160 mm |
| Rear rotor | 140 mm | 160 mm |
| Wheels & tires | ||
| Wheelset | Scope R-series 4 / 6 | Black Inc 48|58 |
| Front rim depth | — | 48 mm |
| Rear rim depth | — | 58 mm |
| Internal rim width | — | 23 mm |
| Material | Carbon | Carbon rims, carbon spokes |
| Rim bead | — | Mini hook |
| Notes | Choice of Scope R4 or R6 in the configurator | Black or silver decals, chosen at order |
| Tires | Vittoria Corsa Pro | — |
| Tire width | 28 mm | — |
| Notes | Tubeless ready | — |
| Cockpit | ||
| Handlebar | AURUM Integrated Handlebar | Black Inc Integrated Aero Barstem |
| Type | One-piece carbon monocoque bar and stem | One-piece bar and stem |
| Integrated stem | Yes | Yes |
| Widths available | 380, 400 or 420 mm at the hoods (395/415/435 mm at the drops) with 90-130 mm stems, chosen in the configurator | 36, 38, 40, 42 cm |
| Bar reach | 80 mm | 80 mm |
| Bar drop | 125 mm | 120 mm |
| Flare | 4° | — |
| Cable routing | Fully internal | — |
| Material | Carbon | — |
| Weight | 330 g11.6 oz | — |
| Notes | 330 g for 400x110 mm including mounting hardware (AURUM's handlebar page); the Magma page quotes 320 g. Removable CNC mount for Garmin, Wahoo and GoPro. | Stem length 80-140 mm in 10 mm steps, chosen at order; drops flare by 30 mm |
| Saddle & seatpost | ||
| Saddle | Prologo Scratch M5 Nack | — |
| Seatpost | AURUM MAGMA Carbon | Factor OSTRO VAM Seatpost |
| Offset / setback | 0 or 20 mm | 0 mm or 20 mm setback, 350 mm long |
| Material | Carbon | Carbon |
| Weight | 170 g6 oz | — |
| Bar tape | AURUM Experience | — |
| Thickness | 3 mm | — |
| Included extras | ||
| Bottle cages | — | Black Inc Aero Integrated Bottle Cages |
| Geometry (smallest – largest size) | ||
| Sizes | 48, 51, 54, 56, 58 | 45, 49, 52, 54, 56, 58, 61 |
| Rider height min | 152–180 cm5′0″–5′11″ | — |
| Rider height max | 163–188 cm5′4″–6′2″ | — |
| Stack | 505–592 mm19.9–23.3″ | 502–611 mm19.8–24.1″ |
| Reach | 371–401 mm14.6–15.8″ | 360–409 mm14.2–16.1″ |
| Seat tube angle | 73.3–75° | 73.5–75.5° |
| Head tube angle | 71.8–73.2° | 71.1–73.3° |
| Head tube length | 103–189 mm4.1–7.4″ | — |
| Effective top tube | 506–579 mm19.9–22.8″ | — |
| Seat tube length | 435–549 mm17.1–21.6″ | 432–554 mm17–21.8″ |
| Chainstay | 408–410 mm16.1–16.1″ | 405–410 mm15.9–16.1″ |
| Wheelbase | 967–1,008 mm38.1–39.7″ | 969–1,022 mm38.1–40.2″ |
| BB drop | 71–74 mm2.8–2.9″ | 70–72 mm2.8–2.8″ |
| Fork length | 370 mm14.6″ | — |
| Fork offset | 44–50 mm1.7–2″ | 43–57 mm1.7–2.2″ |
| Trail | 58–60 mm2.3–2.4″ | 58–58.6 mm2.3–2.3″ |
| Front centre | 570–608 mm22.4–23.9″ | — |
| Standover | 721–826 mm28.4–32.5″ | 726–840 mm28.6–33.1″ |
| Wheel size | 700c | — |
| Handlebar reach | 80 mm3.1″ | — |
| Handlebar drop | 125 mm4.9″ | — |
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).