3T - PRIMO
GRX 1×12 700c

SQAERO

A wide 50 mm downtube catches air from the front tire—but a deep full airfoil would be inefficient. That’s why 3T designed the Sqaero shape. With a 50×75 mm profile, Sqaero balances aerodynamics and stiffness. This shape also shields your bottles. You’ll find it all over the Primo frame.

PRIMO versus RACEMAX, EXTREMA and ULTRA

RaceMax, Ultra and Extrema are built for gravel, each with unique strengths. Primo is different: it brings road-bike DNA with gravel adaptability. Ride it with fast 700c wheels or swap to 650b for rough terrain. Primo is your all-rounder—versatile, elegant, and ready for any road.

REALFAST AERODYNAMICS

Aerodynamics matter—even on gravel. You may go slow off-road, but on tarmac, speed returns. And wind resistance never takes a break. 3T tested Primo at 32 km/h, with bottles and mud. Real-world conditions. The result? Primo is faster dirty with 40 mm gravel tires than clean bikes with 28 mm slicks.

WHAT’S MY FRAME SIZE?

Sing the right bike size is crucial for a comfortable and enjoyable ride. Use this chart to pick the size which fits your body. Please note, this is merely a suggestion. For the best results, we recommend a professional bike fitting with an expert.

IT ALL STARTS WITH THE TIRES

To build the fastest bike possible, you start with the tires. They define grip and comfort—and how the frame can guide airflow. But printed sizes lie. 3T measured hundreds of tires to get their real-world widths (WAM) and radii (RAM). With this data, Primo is built to fit road, gravel and even wide 650b tires when adventure calls.

Key features

Lightweight aero carbon frame with REALFAST design, made for real tire widths and top speed.
Shimano GRX 1×12 groupset with wide-range 10–45T cassette for smooth, reliable shifting.
Powerful hydraulic GRX brakes with 160 mm rotors for confident stopping.
Gravel-tuned setup: 700×45 mm Pirelli tires and Fulcrum wheels for traction and durability.
Built for long rides with ergonomic cockpit and adventure-ready geometry.

Product details
Delivery info
Size help

Details

Frame material

Unidirectional pre-preg carbon, High-modulus/high-strength performance blend layup

Fork

3T Fango

Headset

Sealed cartridge 1.125” - 1.5”

Thru-axle

100x12 front - 142x12 rear (specific for hang loose hanger)

Handlebar

3T Superergo LTD (S: 40cm - M&L: 42cm - XL: 44cm)

Bar Tape

3T Prendo Tough

Stem

3T Apto Stealth (S:80mm - M:90mm - L: 100mm - XL:110mm)

Bottle cage

3T nylon front load water bottle cage

Rear derailleur

Shimano GRX RD-RX822 GS RD+ 12s

Shift/brake levers

Shimano GRX ST-RX610 12s

Brakes

Shimano BR-RX400 (SM-RT64 160mm rotors)

Crankset

Shimano FC-RX610-1 40T 12s (S: 170mm, M&L: 172.5, XL: 175mm)

Cassette

Shimano CS-M6100-12 10-45T

Wheelset

Fulcrum Rapid Red 900 700c or Fulcrum Racing 600 700c

Tires

Pirelli Cinturato Adventure 700x45

Seatpost

3T Primo setpost for Ritchey clamp

Saddle

Selle Italia Novus Boost Evo Superflow

*Additional info

Specifications are subject to change without notice

At RimRebellion, we do everything we can to make the purchase of your new 3T bike as simple and worry-free as possible. You can choose between two delivery options – both completely free of charge:

1. In-store pickup at RimRebellion Store (Bratislava)

Order your bike online and pick it up directly at our RimRebellion Store & Community Café on Košická 27 in Bratislava. We’ll have your bike fully prepared, professionally set up, and double-checked with you before handing it over. You’ll also have the opportunity to consult with us on the spot – completely free.

2. Courier delivery to your address

We’ll deliver your bike conveniently anywhere in Slovakia. Before shipping, we carefully adjust, inspect, and pack your bike into a specially designed 3T box. Upon delivery, just a few simple steps are needed to complete the setup – we’ll guide you through everything.

You can easily choose your preferred delivery method in the cart during checkout.

GEOMETRIES

Size

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"

Max. BB to saddle rail** (mm)

763

790

818

845

Stack

517

546

575

604

Reach

366

378

390

402

Headtube angle

69.5

71.1

72.5

Fork rake

Fork axle-crown

395

Front center

591

598

606

627

Rear center

415

BB drop

Headtube length

101

125

150

180

Toptube length

529

550

571

592

Seattube length

463

490

518

454

Seattube angle

72.5

Technologies

SQUAERO FORK LEGS

Sqaero fork airfoil, perfect to guide the airflow around the front wheel and boost fork stiffness.

SQUAREO HEADTUBE, DOWNTUBE AND SEATTUBE

Squaero frame shapes 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 46mm tires and even 27.5”x51mm (2.0”), while keeping 4mm between any frame part and tire.

1X AND 2X COMPATIBILITY

1x transmission for simplicity and efficiency - 2x groupset compatible

SEATPOST EXPANDER

Aero-optmized and user-friendly just like on the Strada.

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

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RimRebelion Ride Mate Club

3T - PRIMO GRX 1×12 700c

SQAERO

PRIMO versus RACEMAX, EXTREMA and ULTRA

REALFAST AERODYNAMICS

WHAT’S MY FRAME SIZE?

IT ALL STARTS WITH THE TIRES

Key features

Product details

Delivery info

Size help