Fast and Slim Exploro Racemax Boost Proves a Gravel E-Bike Can Win the Race 15 May 2021, 8:05 UTC · by 3T is taking its successful gravel bike, the Exploro Racemax, to the next level, by turning it into an e-bike. The new Exploro Racemax Boost promises great speed for off-road adventures, with the same aerodynamic frame as we're used to. 11 photos The new Racemax Boost is built similarly to the standard Exploro, which was meant to revolutionize gravel bike design with its aerodynamic frame. What makes it unique is the Mahle ebikemotion X35 system, an advanced motor that is lightweight enough to be integrated without having to modify the frame’s shapes, but also powerful enough for off-road riding.