CarboXtrem
Carbon 3D Nexus Saddle
Carbon 3D Nexus Saddle
With the 3D Nexus Saddle, every rider enjoys a custom-made solution optimized for their body and riding style. A technological advancement that elevates the experience of every ride.
Superior comfort: Fatigue reduction and vibration absorption.
- Compac format 140mm x 240mm, and with only 146 gr.
- DLS Technology by Carbon 3D: Unmatched precision and consistency.
Ajuste perfecto garantizado
Si algo no encaja, lo ajustamos y te lo devolvemos hasta que quede perfecto.
Producto fabricado a medida
No admite devolución estándar una vez iniciada la fabricación.
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- Made to measure. 100% compatible.
Perfect-fit guarantee.
- Made in 2 weeks. Shipped in 24/48h.
Which size am I? Two minutes and a piece of cardboard
It's the only question that really matters, and you don't need a bike fitter to answer it. Your sit bones are the two bones you actually sit on: the distance between them decides your size.
- Take a piece of corrugated cardboard (a box will do) and put it on a hard chair, with no cushion.
- Sit on it with your feet flat on the floor, back straight, and lean forward slightly, as you would on the bike.
- Put your weight through it for a few seconds and stand up. You'll see two pressed-in marks on the cardboard: those are your sit bones.
- Measure in millimetres from the centre of one mark to the centre of the other. That number is your sit bone width.
Most cyclists fall between 110 and 130 mm. If you measure 118, choose the 110mm - 120mm range. And if you land right on the edge, go for the range above.
Not sure, or no cardboard to hand? No problem.
Choose "I don't know - help me choose" in the dropdown above and place your order as normal. I'll write to you before I start building and we'll nail the size together in a couple of messages. I'd rather do that than sell you the wrong measurement.
And if you'd rather sort it before buying, message me on WhatsApp and we'll go through it.
Maximum comfort. Minimum weight. No compromises.
The CarboXtrem 3D-printed saddle is not just another saddle.
It's the result of applying the best manufacturing technology to high-performance cycling.
Made with EPU 41 resin by Loctite and Digital Light Synthesis™ technology from Carbon3D, this saddle offers a perfect balance of light weight, flexibility and support.
Its Voronoi design — used by every premium brand on the market — spreads pressure, absorbs vibration and improves pedalling efficiency from the first kilometre.
At just 146 grams and in a compact 240 × 140 mm format, it's ideal for riders who want professional performance without giving up comfort.
Comparison: Carbon 3D Nexus saddle vs traditional saddles
| Carbon 3D Nexus saddle | Traditional saddles | |
|---|---|---|
| Custom | Designed specifically for each rider, matched to their weight and needs | Generally built in standard sizes, with no personalised adjustment |
| Comfort and stability | Non-slip surface and vibration absorption for maximum comfort and efficiency | Less grip and less cushioning |
| Durability | Resists wear thanks to advanced materials such as EPU 41 | More wear over time and in extreme conditions |
| Weight | 146g: one of the lightest for the 140x240mm size | Normally ~150g for much smaller sizes |
📖 Related guide: Customisation and Biomechanics: How 3D Saddles Adapt to You
Frequently asked questions
What material and technology is it made with?
3D printed with EPU 41 resin by Loctite and Digital Light Synthesis™ technology from Carbon3D, with a Voronoi structure.
How much does it weigh and what size is it?
Just 146 g, in a compact 240 × 140 mm format.
What does the Voronoi structure add?
It spreads pressure, absorbs vibration and improves pedalling efficiency from the first kilometre.
How do I know which size I need?
You need two things: your weight and the distance between your sit bones. You already know your weight. You can measure the distance in two minutes by sitting on a piece of corrugated cardboard and measuring from the centre of one mark to the centre of the other. Most cyclists are between 110 and 130 mm. If you're unsure, message us on WhatsApp and we'll help you choose.
What if I don't know my sit bone width?
Message us on WhatsApp before buying and we'll work it out with you. Better to spend two extra messages and have the saddle fit first time.
Technical specifications
Technical specifications
Who is this product ideal for?
Who is this product ideal for?
Frequently Asked Questions
Frequently Asked Questions
Warranty
Warranty
Lifetime warranty included.
Our components are designed and built with high-precision 3D technology and certified materials.
That's why every CarboXtrem product comes with a lifetime warranty against any manufacturing defect.
If something fails on our side, we fix it. No excuses.
Model compatibility
Is your bike compatible?
Select your brand to check:
CarboXtrem, a leader in 3D printing for high-performance cycling
At CarboXtrem we specialise in 3D-printed cycling components for riders who won't settle for standard.
We design and manufacture Aero aerobars, grips, saddles and other key parts with millimetre precision, using materials such as carbon fibre and EPU 41 resin, used by leading brands like Specialized and Adidas.
Every piece adapts to your body, your bike and your discipline (road, triathlon, gravel). No generic sizes. No pain. Just performance.
Why do riders choose us?
At CarboXtrem we customise every aerobar, every grip, every saddle…
| Feature | CarboXtrem | Other brands |
|---|---|---|
| Measurements | Yours, taken from your body | Standard |
| Technology | Carbon 3D: 5 times more durable | Plastics |
| Vibration reduction | Up to -92% vibration | No active impact absorption |
| Injury prevention | Prevents neck, hand and sit-bone pain caused by a poor fit | Causes chronic discomfort and fatigue |
| Fitting | Compatible with 250+ models, with step-by-step guidance | Little room for adjustment |
STEP 1: Buy online and talk to us directly
After your purchase, we contact you on WhatsApp to start the customisation process. No complicated forms, no waiting.
STEP 2: We guide you through taking your measurements
We send you visual instructions for gathering the data we need, depending on the product you bought.
For aerobars:
- Height and weight
- Your biomechanical arm measurement
- Exact measurements of your handlebar
The whole process explained with step-by-step images.
STEP 3: We verify and build with precision
We compare your data against our model database. We've built for almost every existing model and brand, and for most body geometries.
If something doesn't add up, we tell you before we build.
Then we make your product 100% to measure using Carbon3D technology (aerobars, grips, saddle, etc).
⏱ Build time: 5–7 days.
STEP 4: Receive it, fit it and ride
Express shipping in 24–48h.
You get support by WhatsApp or video call to help you fit your kit correctly.
We also send you installation videos.
