DualBox®6-TR Inline Frame 4x110 and 3x125
Find Your Perfect Fit in 2 Minutes:
How to Choose Your Size
Scan Your Feet
Follow the steps in the app. You’ll receive a detailed 3D profile of both feet.
Use the Cádomotus Size Chart
Our chart shows the length of the last—the mold your shoe is built on—not the length of your foot.
➤ Choose a size that’s at least 2–4 mm longer than your longest foot for a snug, race-optimized fit.
Understand Width and Instep Height (1–5 Scale)
The app shows both measurements on a 1–5 scale:
- 3 = average → standard fit
- 2 or 4 = slightly narrow/wide or low/high → ideal for heat molding to fine-tune the fit
- 1 or 5 = very narrow/wide or very low/high → see options below
Wide Foot Tip
If you're borderline wide (scale 4), you can also try sizing up one size for more space.
Following these guidelines ensures a snug yet comfortable fit for optimal performance.
| Millimeters | European size |
|---|---|
| 235 | 37 |
| 241 | 38 |
| 248 | 39 |
| 255 | 40 |
| 261 | 41 |
| 268 | 42 |
| 275 | 43 |
| 281 | 44 |
| 288 | 45 |
| 295 | 46 |
| 301 | 47 |
- Worldwide shipping
- Low stock - 6 items left
- Out of Stock
- Pitch (mm):
- Wheel setup:2-in-1 (3W or 4W)
- Spacer length (mm):
- Shim angle (°):
- Best screw length (mm):14
- Weight (g):210
- Profile:dualbox®6
- Length (in):13.2
- Mount separation (mm):195
- Alloy:6061
The sixth edition of our best frame! After many world titles, we went back to basics with our design. This is the only frame on the market in which you can install three as well as four wheels, thanks to the dual box technology. That makes the Dualbox6TR the only high-end frame on the market that actually can be used for races on the road and the track.
Competitive inline skaters sometimes take two pairs of skates to an event. One pair with three wheels for races on the road and one pair with four wheels for races on the track. According to the new rules of the world skating organization. But it is not necessary anymore to buy and maintain two complete set-ups.
The advantages of the DualBox® frame
The DualBox frame is made of one piece of aluminum. The tubular sidewall (dual box) provides rigidity and proportional distribution of power during the full push-off. In contrary to other brands, we don’t use extra reinforcements. In fact, these so-called bridges – the connections between both of the sidewalls – make the frame in certain areas very rigid and in other areas more flexible.
DualBox makes the rigidness of the frame in all areas completely the same. As you can imagine, this will provide more control and predictability. And when you compete at a high level, this can make the difference. Every skater wants to be in tune with the surface and to feel in control, especially in the moments when it counts.
- More stability gives you more control and predictability. When can you put on some extra pressure, and when not?
- More stability gives you more grip and pressure in the corners.
- More stability reduces fatigue in muscles which are responsible for fine motor skills.
As we are using the rigidness of the sidewall, we don’t need reinforcing bridges. That’s the reason why we could build a 2-in-one frame. You have to have an extra room in the profile to do that after all. There is no room for reinforcements, but we don’t need those.
Back to basics
We went back to basics in our 2020 design. The profile has two boot mount platforms and is stripped off any decorations. It is a functional design, thanks to the use of topological research. Smart algorithms are often taking over processes in various human domains, as well as in design. We have analyzed the mechanical and dynamical behavior of the DualBox frame construction using Topology and FEA analysis. Based on the results, we’ve chosen a classic CNC profile and left out all unnecessary connections. Functional design.
So this is our sixth edition of the DualBox frames since 2000. It is a unique design, other than all the other frames that are being produced in the industry. With the DualBox 6, you don’t only have a frame you can trust, but also a brand behind you that is known for innovation and an unprecedented reputation as inline skate frames market leader.
Ordering from Outside the EU? Read This First:
Our warehouse is located in Europe, and all prices shown in our webshop include European VAT (Value Added Tax). However, if you are ordering from outside the European Union, no EU VAT will be charged at checkout — so the amount you pay will be lower than the listed price.
Please note: your local customs office may charge import duties and taxes upon delivery. These fees are not included in your order total and are the responsibility of the buyer. Import rates vary by country and are governed by local regulations.
We recommend checking with your country’s customs authority for more information about applicable import charges before placing your order.