Darimo Carbon IX2 Ultralight Stem - 12 degrees
Darimo Carbon

Darimo Carbon IX2 Ultralight Stem - 12 degrees

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Darimo Carbon IX2 ultralight stem, +/-12° angle, for 31.8 mm handlebars and 1.1/8" standard or 1.1/4" oversize headtubes. With weights from only 57 gr. , is one of the lightest stem in the world but it's super strong, stiff and safe at the same time. Monocoque high module carbon fiber made with special gr.5 titanium bolts. Road, MTB (XC, Enduro), CX and Gravel use. 60-70-80-90-100-110-120-130 mm lenght, 3k or UD, glossy or matte finishing, decal stickers available in many colors. 100% Made in Spain.

Stem Lenght
Head Tube Standard


Shipping Policy


Terms of sale

With weights only 57 grams, Darimo Carbon IX2 is one of the lightest stem in the world. It fit  Oversize  handlebars (31.8 mm diameter) and standard or tapered headtubes with 1.1/8" or 1.1/4" ends (two different versions of the stem), the height on the headtube is 46 mm. It's has got +/- 12° angle but also +/- 6° +/- 17° and +/- 25° are available in our shop (just ask us if don't find them and you're interested). There are many lenghts options : 60-70-80-90-100-110-120-130 mm.

darimo carbon ix2 stem 12°

Darimo Carbon IX2 is not a simple stem but a masterpiece of design and technologies. Clever design, high technologies and best materials are used to create this beauty.
It's light weight doesn't affect stiffness and safety that are strenghts of Darimo Carbon IX2. A 100 mm lenght stem with 3K finishing weighs only 66 gram (+/- 3% tolerance), UD finishing adds about 3-4 grams.

darimo carbon ix2 stem 12°

The stem is monolithic made without junctions or bonding, carbon fiber layers are super compacted and allows a superior strenght.
The stem is made with high quality T800 fibers, oriented in the best way possible thanks to Darimo Carbon great experience on composite materials. Final layer could be 3k plain weave or unidirectional UD with glossy or matte finishing.
Stiffness is guaranteed by:
  • Oversize body shape, for example 35 mm diameter instead 30 mm standard stem diameter increase stiffness in exponential way due to the moment of inertia of the section. Darimo Carbon IX2 increase 40% torsional stiffness with less stress (-20%) so it's also more safe and will last for a long time.

darimo carbon ix2 stem 12°

  • Stem design, the closed type front end is always better for torsional stiffness than an open one (with removable clamp/clamps)

  • Fibers layering, carbon fiber layers are placed to allow the best stiffness/weight ratio possible with a great comfort (where's required)
  • Shaping, round stems have a high torsional stiffness, while more square cross sections are very stable in the vertical direction. As a result, a combination of both forms was selected, which combines the respective advantages. 

darimo carbon ix2 stem 12°

Closed type front end design is the most Darimo Carbon IX2 representative feature. This solution isn't practical during handlebar installation and can create fitting problem with some kind of road handlebars (tipically aero flattened ones) but has got some bigger benefits :
- Greater torsional stiffness
- Lower weight
- More reliability
- Better aerodynamics
- Great look

darimo carbon ix2 stem 12°

Darimo Carbon produce IX2 stem also in traditional shape with removable front clamps which is better for practicality and versatility but surely not in pure performance. The 4 bolts version with removable front clamp is called IX4 and it's available on our shop.

darimo carbon ix2 stem 12°

Every detail is considered all the corners are smooth to avoid any handlebar damage (specially carbon fiber ones), bolts housing are precise to have a linear loads concentration without high load spots. 

darimo carbon ix2 stem 12°

Also the bolts aren't standard, they're special made of Gr.5 Titanium CNC machined with forged heads and rolled threads so the best bolts you can make! Their special design, with the help of CNC machining, allows to save weight and minimize high stress spots. They are M4 bolts with special oversized head to prevent damages during the assembly. They are available in black color.

darimo carbon ix2 stem 12°

The bolts are screwed on to threaded inserts made of 7075T6 Aluminium. The special rounded design allows a perfect mechanic and aesthetic fitting. Inserts comes in black anodized color.
Sticker decals with Darimo logo are easly removable and customizable (white, black, gold, red, yellow, orange and blue color decals are available, please specify what do you prefer in order notes)
We always advise to use a good quality and precise torque wrench to tightening stem bolts following user manual instructions (3.5 Nm max allowed).
Darimo Carbon IX2 stem after FEM simulation, easly withstand severe UNI-EN-ISO 4210 safety test, so it's light, stiff and affordable at the same time. These great results comes after many lab tests and a clever product developing. 

darimo carbon ix2 stem 12°

Darimo Carbon IX2 stem is adapt for MTB Xc use, but can also be used for Road Racing or Gravel, the only limitation is the handlebar fitting. Closed front end design with unremovable clamp can create fitting problems with aero type flattened and compact bend road handlebars.
Darimo Carbon IX2 stem is compatible with Darimo Carbon Ellipse road handlebar, the fitting procedure is shown on a video that you can find on Darimo YouTube channel and also in this product page.

darimo carbon ix2 stem 12°

Who want to use a darimo Carbon stem with compact bend or aero road dropbars should choose IX4 model with 4 bolts standard removable front clamp. You can find it in our shop.
Darimo Carbon IX2 stem require not less than 43 mm of free head tube for a safety installation.
Max rider weight is 90 kg (rider + clothing + luggage) but, as all Darimo Carbon products, could be custom build with some reinforcements and no rider weight limit.
Darimo Carbon IX2 comes with a nice packaging which include also product user manual and installation kit with mounting paste specific for carbon fiber.

darimo carbon ix2 stem 12°

Darimo Carbon products are handmade and custom made with many sizes, finishing and laminations. Have in stock all of them is very difficult also for Darimo Carbon that made them on request.
Products that are availables in our warehouse has got "IN STOCK" indication. All other product combinations has to be ordered from Darimo and this will takes about 15-20 days.
These products has to be considered ordered on request so the right of withdrawal can't be applied to. This kind of order require advance payment for total amount.
All Darimo Carbon products are 100% handmade in Spain.

darimo carbon made in spain

Data sheet

Weight :
57 gr. (60 mm) - 59 gr. (70 mm) - 61 gr. (80 mm) - 63 gr. (90 mm) - 66 gr. (100 mm) - 70 gr. (110 mm) - 74 gr. (120 mm) - 78 gr. (130 mm) +/- 3% tolerance (UD + 3-4 gr.)
Construction :
Bar clamp diameter :
31.8 mm Oversize standard
Lenght :
60-70-80-90-100-110-120-130 mm
Width :
46 mm
Steer tube clamp diameter :
1.1/8" or 1.1/4"
Angles :
+/- 12°
Hardware Material :
Al 7075T6
Graphics :
Bolts :
Special CNC Grd5 Titanium
Fork clamp height :
46 mm
Use :
MTB, Road, Cross
Max rider weight :
90 kg (rider + cloth + luggage), no rider weight limits on demand
Max tightening torque :
3.5 Nm


Darimo Carbon IX2 Stem

Darimo Carbon IX2 Stem Instruction Manual

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