Primo

THE WORLD’S FIRST FULL-AERO GRAVEL BIKE

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The Exploro Primo has changed gravel riding & racing forever, combining road speed and mountain toughness.

“A bike that literally can replace an entire stable gathering dust in a garage. A bike that exhibits the ride and reactive feel of a road frame to keep you competitive on the fastest group attack, yet can handle a black diamond extreme downhill at your local summer mountain.”

GRAVELPLUS: FIT ROAD, GRAVEL & MTB TIRES

The Exploro Primo is designed to fit road, cross and even mountain bike tires following the GravelPlus standard. The road and cross tires are 700c, the mountain bike tires use the 650b size, ensuring that all of these have virtually the same overall wheel diameter and therefore the same predictable handling. For 700c, we recommend our3T Discus wheels, for 650b our3T DiscusPlus wheels.

REALFAST

Why is aerodynamics important on allroad (asphalt, gravel, fire roads, single track) rides?

  • You may go slow off-road, but on the connecting asphalt sections you need road riding speed.
  • If you’re slow because of gradients, aero doesn’t matter much. But if it\'s due to head- or crosswinds, you\'re slow relative to the ground but very fast relative to the air and that’s what determines the resistance you experience (that’s exactly why you’re slow).
  • The Exploro is also a great road bike in its own right. When using it for fast paved (group) rides, any aero benefit is appreciated.

We didn’t want the Exploro Primo to be fast in theory, but in the real world. So we tested at a realistic 20mph (32kmh) instead of the standard 30mph (48kmh) and optimized the frame for water bottles (tough to do long, epic rides without). We even designed the Sqaero shape to work well when covered in mud! The result? A muddy Exploro with 40mm knobby gravel tires and 2 water bottles (red line in the graph) is faster than the equivalent clean round tube bike is with 28mm slick road tires and without bottles (grey line).

SQAERO

The key to the Exploro’s speed is the aero downtube that is wide enough to catch the airflow coming off the big front tire (a skinny downtube wouldn’t even touch the airflow). But at 50mm wide, a full airfoil with a normal ratio would have to be 150-200mm deep, causing too much surface drag. So we square off the tail, keeping most of the aero performance with a 50x75mm cross section that is also close to perfect for strength and stiffness; our Sqaero shape. The wide downtube also effectively shields the water bottles.

We also use Sqaero on the headtube, seattube, seatstays and seatpost.

design in details

FRAME SPECIFICATIONS

For frame specifications, component compatibility, clearances, etc, please check ourEXPLORO PRIMO FRAME SPECIFICATIONS. Geometry information is found below

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"
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 72.5
Fork rake 50 50 50 50
Fork axle-crown 395 395 395 395
Front center 591 598 606 627
Rear center 415 415 415 415
BB drop 70 70 70 70
Headtube lenght 101 125 150 180
Toptube lenght 529 550 571 592
Seattube lenght 463 490 518 545
Seattube angle 72.5 72.5 72.5 72.5