The iconic bike whose unbeatable aerodynamics and speed changed gravel riding forever, now in a modern evolution.
A special livery to celebrate 10 years of exploro on our gateway to gravel.
Specs
FRAMESET
- FRAME
- Primo2 UDH - painted in Italy
- FRAME MATERIAL
- Unidirectional pre-preg carbon, High-modulus/high-strength performance blend layup
- FORK
- 3T Fango Primo2
- HEADSET
- Sealed cartridge 52/40 (45deg)
- THRU-AXLE
- 100x12 front - 142x12 rear
- STEM
- 3T Apto with semi-Integrale spacer kit (S:80mm – M:90mm – L: 100mm – XL:110mm)
- BOTTLE CAGE
- 3T nylon front load water bottle cage
- SEATPOST
- 3T Primo setpost for Ritchey clamp
Road-inspired geometry and tire versatility
Choose Primo for road-inspired geometry and tire versatility
Fast on any surface
The perfect all-round bike: fast on any surface, from tarmac to gravel
Elegant and efficient
3T Semi-Integrated technology is the perfect design solution for clean cable integration.
UDH Compatible
Engineered for optimal shifting performance.
WE PAINT!
While the advanced carbon technology we use lets us showcase the material itself as a design element, we know that color is one of the key ways a 3T bike expresses personality and style. That’s why we invest so much time in creating original graphics, selecting premium paints, and developing striking finishes.
Because we know how strongly color defines a bike’s identity and character, we decided to bring painting in-house, at our factory in Presezzo, Italy. Today, every 3T frame is painted in Italy.
With the launch of our in-house paint facility and the WPNT custom program, we can finally say we own the full creative process of making our bikes, from engineering to color design.
IT ALL STARTS WITH THE TIRES
To design a fast bike, you have to start with the wheels. Tire choice determines comfort and grip, but also affects aerodynamics and even frame design. And to design around aerodynamics, you need to know the real tire dimensions; the ones you actually measure. That’s what REALFAST aerodynamics means: reality, not theory.
Tire size and shape depend on rim width, tire pressure, and even the accuracy of the manufacturer’s stated dimensions.
So we ran hundreds of tests and measurements to map the actual tire dimensions, what we call WAM (Width As Measured) and RAM (Radius As Measured), and used those numbers to design the frame.
Check the maximum WAM and RAM for PRIMO² here.
REALFAST AERODYNAMICS
Aerodynamics matter even off-road.
You notice it most when you’re not grinding uphill, but riding on tarmac or smoother gravel. With headwinds or crosswinds, even if your ground speed is moderate, you’re still moving fast relative to the air; and that’s exactly why aerodynamics make a difference.
PRIMO² is also a great road bike in its own right. That’s because we designed, tested, and optimized it not only at 30 mph (48 km/h) the wind tunnel standard for road bikes, but also at a more realistic 20 mph (32 km/h), which better reflects off-road gravel, dirt, and singletrack speeds.
We developed the Squaero profile by testing the bike with knobby tires and even caked in mud.
SQAERO
PRIMO²’s aerodynamic performance starts with its down tube. At 50×75 mm with a truncated Sqaero profile, it provides not only optimal stiffness, but also the ideal shape to guide airflow around a wide front tire.
Designing a full airfoil starting from a 50 mm width (needed to continue the airflow from the front wheel) would require a profile height of 150–200 mm creating too much surface drag. With the truncated Sqaero profile, even the bottles remain shielded from airflow.
To optimize REALFAST aerodynamics across the entire platform, we applied the Sqaero profile not only to the down tube, but also to the head tube, fork, seatpost, and seat stays.
Primo² versus Racemax, Extrema and Ultra
Racemax and Extrema Italia all feature gravel-specific geometries. Racemax is designed as the ultimate choice for fast gravel or racing; when speeds get serious.
Extrema Italia excels in non-stop ultra adventures and the toughest off-road races, while Ultra combines exceptional ground clearance for extreme terrain with efficient aerodynamics.
Primo², by contrast, has a road-inspired geometry while still offering wide tire and wheel options. Ride fast on 700c wheels, then switch to 650b and bigger tires when adventure calls.
Your Primo² is ready for anything.
Geometries
| SIZE | S | M | L | XL |
|---|---|---|---|---|
| RIDER HEIGHT* (CM) | 157-170 | 168-180 | 178-191 | 188-201 |
| RIDER HEIGHT* (INCHES) | 5'2"-5'7" | 5'6"-5'11" | 5'10"-6'3" | 6'2"-6'7" |
| 01. STACK** | 517 | 546 | 575 | 604 |
| 02. REACH | 366 | 378 | 390 | 402 |
| 03. HEADTUBE ANGLE | 69.5 | 71.1 | 72.5 | 72.5 |
| 04. FORK AXLE-CROWN | 395 | 395 | 395 | 395 |
| 05. HEADTUBE LENGTH | 101 | 125 | 150 | 180 |
| 06. BB DROP | 70 | 70 | 70 | 70 |
| 07. SEATTUBE ANGLE | 72.5 | 72.5 | 72.5 | 72.5 |
| 08. SEATTUBE LENGTH | 463 | 490 | 518 | 54 |
| 09. TOPTUBE LENGTH | 529 | 550 | 571 | 592 |
| 10. FRONT CENTER | 591 | 598 | 606 | 627 |
| 11. REAR CENTER | 415 | 415 | 415 | 415 |
| 12. WHEELBASE | 996 | 1003 | 1011 | 1032 |
- Rider heights are approximations. For more accuracy, compare stack/reach with your current bike. ** Actual stack height is 15 mm higher due to Apto cable cover.
Design in details
SQAERO FORK LEGS
Sqaero fork airfoil, perfect to guide the airflow around the front wheel and boost fork stiffness.
SQAREO HEADTUBE, DOWNTUBE AND SEATTUBE
Sqareo frame shape complete the aero fork blades
DROP CHAINSTAY ON DRIVE SIDE
Dropping the drive-side chainstay improves tire & crank clearance.
TIRE CLEARANCE
Fits up to 700 x 45mm tires and even 27.5”x51mm (2.0”), while keeping 4mm between any frame part and tire.
1X AND 2X COMPATIBILITY
1x for simplicity and efficiency - 2x compatible
3T SEMI-INTEGRATED TECHNOLOGY
The perfect design solution for clean cable integration. Compatible also with 1x and 2x mechanical groupsets.
THREADED BB
All the Primo complete bikes come with threaded BBs without any alloy rings in the carbon (avoiding added weight, complexity and debonding risk).
RITCHEY RAIL CLAMP
Available for round and oval rails.
2 BOTTLE POSITION DOWNTUBE
When using one bottle cage, go for the lowest downtube position for the best aero advantage
UDH COMPATIBLE
Engineered for optimal shifting performance.
SEATPOST EXPANDER
Aero-optmized and user-friendly.
| SIZE | S | M | L | XL |
|---|---|---|---|---|
| RIDER HEIGHT* (CM) | 157-170 | 168-180 | 178-191 | 188-201 |
| RIDER HEIGHT* (INCHES) | 5'2"-5'7" | 5'6"-5'11" | 5'10"-6'3" | 6'2"-6'7" |
| 01. STACK** | 517 | 546 | 575 | 604 |
| 02. REACH | 366 | 378 | 390 | 402 |
| 03. HEADTUBE ANGLE | 69.5 | 71.1 | 72.5 | 72.5 |
| 04. FORK AXLE-CROWN | 395 | 395 | 395 | 395 |
| 05. HEADTUBE LENGTH | 101 | 125 | 150 | 180 |
| 06. BB DROP | 70 | 70 | 70 | 70 |
| 07. SEATTUBE ANGLE | 72.5 | 72.5 | 72.5 | 72.5 |
| 08. SEATTUBE LENGTH | 463 | 490 | 518 | 54 |
| 09. TOPTUBE LENGTH | 529 | 550 | 571 | 592 |
| 10. FRONT CENTER | 591 | 598 | 606 | 627 |
| 11. REAR CENTER | 415 | 415 | 415 | 415 |
| 12. WHEELBASE | 996 | 1003 | 1011 | 1032 |
Revolution. Then evolution.
The real revolution was the Exploro.
From that moment on, we chose a different path: not to reinvent the bicycle over and over again, but to improve it without betraying its identity. Every update was driven by experience in the field and by the pursuit of a bicycle that was ever simpler, more effective and more functional.
To us, every new version was never a new beginning; it was another step forward.
The 2018 model was identified by the letters FM, standing for Flat Mount:
the new brake caliper mounting standard that had by then replaced the previous Post Mount interface. But that was only part of the story. The new Fango fork featured cleaner, more minimal lines than the original Luteus; the seatpost clamp became accessible from above, making adjustments easier; and the thru-axles adopted a slimmer design, anticipating a solution still found on today's Primo² models.
Small changes. One clear direction.
Because a good project is never truly finished.
Primo² WPNT 10th Anniversary
Every project leaves a trace.
After ten years of continuous evolution, we chose to celebrate Exploro with a bicycle that looks forward rather than back. Instead of looking at the past with
nostalgia, it brings together the very best of Exploro's journey and turns it
into the starting point for what comes next.
The graphic design of the Primo² WPNT 10th Anniversary is built by layering together the visual identities that accompanied Exploro between 2016 and 2026.
Paint schemes, logos and graphic elements overlap like chapters of the same story, capturing ten years of evolution in a single design.
Product Information
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