Extralite Ultrastem OC
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Extralite Ultrastem OC, 31.8 mm oversize MTB standard stem. With their 82 grams (90 mm) is one of the lightest stem in the world but is stiff and safe at the same time. Fully CNC machined aluminum made with special grd 5 titanium bolts.Black anodized with black, red, orange or gold front clamps.
Terms of sale
Ultrastem OC 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 don't affect stiffness and safety that are strenghts of Ultrastem OC.
Ultrastem OC is fully CNC made from a bar of forged 7075Txx Al. Forging and special military heat treatment gives to stem body an incredible strenght. Superfine 5 axles CNC machining assure perfect shape optimized for weight and also with smooth finish ideal to increase fatigue life.
35 mm oversize body diameter instead 30 mm standard stem diameter increase stiffness in exponential way due to the moment of inertia of the section. So Ultrastem OC increase 40% torsional stiffness with less stress (-20%) so it's also more safe and will last for a long time.
Why other brands don't use the same Ultrastem OC technology? Because isn't so easy and cheap to produce a similar stem, other stems are usually made from a forged bar but this tecnology couldn't be used to make a stem which body diameter is larger than front clamp bolts circle diameter. The only way to go is the expensive fine CNC machining and Extralite makes this better than any other competitor.
Front clamps are also CNC machined from a forged plate of aluminum, special heat treatments allow them to be light and strong at the same time. They looks minimal but they withstand all safety and fatigue tests. They are one far from the other to increase torsional stiffness and minimize handlebar flexion.
Every detail is considered all the corners are smooth to avoid any handlebar damage (specially carbon fibre ones), bolts housing are precise to have a linear loads concentration without high load spots.
Also bolts aren't standard, they're special made for Ultrastem OC, they're Gr.5 Titanium CNC machined with forged heads (Torx insert) 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. These are little details but for Extralite are much important!
We always advise to use a precise torque wrench to tightening Ultrastem OC bolts. Torque specs are written on product user manual that comes with the stem and that you can also download here. We reccomend to use an antiseize compound on titanium bolts threads and where they are in contact with aluminum stem parts to avoid oxidation.
Ultrastem OC clear and smooth design has also an ergonomic function because there are not dangerous sharp edges that could hit rider legs.
Anodized black finish is light and durable, laser etched graphics too. You can add a note of color and customization choosing coloured front clamps that only Dream Bikes can offer you. These custom front clamps are made from Extralite only for us.
Ultrastem OC after FEM simulation, easly withstand severe UNI 10518 safety test, so it's light, stiff and affordable at the same time. These great results comes after 10 years of clever product developing. Many riders used and still using Ultrastem OC winning many races all over the world!
Please take note that in some pictures Ultrastem OC is shown with Extralite Hypercap which is not included in Ultrastem price but you can buy it separatly. You can find it inside accessories section in this product schede.
Ultrastem OC is 100% Made in Italy!
- Bar clamp diameter :
- 31.8 mm Oversize standard
- Lenght :
- 90-100-120 mm
- Steer tube clamp diameter :
- 1.1/8" standard
- Angles :
- +/- 4° reversible
- Material :
- Totally CNC from AL 7075 Txx
- Graphics :
- Laser etched
- Bolts :
- Special CNC Grd5 Titanium
- Fork clamp height :
- 42 mm
- Use :
- XC Only