Experience the future of gravel riding with the 2024 3T Exploro RaceMax Boost GRX Flatbar, a bike that seamlessly integrates electric assistance into one of the world’s fastest gravel platforms. Now available in a 56cm size, this is an e-bike designed for true cyclists who refuse to compromise on handling, weight, or aesthetics . It features a stealthy, award-winning design that hides the motor and battery within a race-proven carbon frame, delivering a natural-feeling power boost that simply makes you feel like you have the best legs of your life . Whether you’re keeping pace with faster friends on group rides, extending your gravel adventures, or conquering a commute without breaking a sweat, the RaceMax Boost is your ticket to more speed, more range, and more fun .

Frame and Fork

Frame: The heart of this bike is the Exploro RaceMax Boost carbon frame, constructed from high-modulus unidirectional pre-preg carbon for an ideal blend of light weight, stiffness, and compliance . Crucially, it shares the exact same geometry and aerodynamic tube shaping as the award-winning, non-electric Exploro Racemax. This means you get the same agile handling and “squaero” tube profiles that cheat the wind, without any of the handling penalties often associated with e-bikes . The frame also features massive tire clearance (up to 61mm on 650b wheels), allowing you to tackle the roughest terrain with confidence .
Fork: The matching 3T Fango RaceMax carbon fork features a compact crown for optimal aerodynamic efficiency and precise steering control .
Integration & Aesthetics: The design is so clean that it’s difficult to distinguish the Boost from a standard bike at a glance. This “stealth” approach earned it a prestigious Red Dot Design Award in 2025 for its ability to conceal the motor while retaining a dynamic, aerodynamic profile .

Motor and Battery

Motor: The bike is powered by the refined Mahle X35 ebikemotion rear hub motor system, co-developed with 3T . This 250W motor delivers a smooth, natural power ramp-up that feels like a natural extension of your own pedaling . It offers three levels of assistance (Eco, Medio, Turbo) to suit any situation, from a subtle push on a group ride to maximum boost on challenging climbs .
Battery: A discreet 250Wh battery is fully integrated and hidden within the downtube, maintaining the bike’s sleek lines . This provides a useful range of approximately 60–80 km (37–50 miles) with moderate assist, perfect for day rides, long commutes, or shorter loaded trips . For extended adventures, an optional second battery can be mounted under the downtube without sacrificing the two water bottle mounts .
Operation: The system is controlled via a simple, integrated top tube button with LED indicators for battery level and assist mode, keeping the cockpit clean and uncluttered .

Drivetrain

Shifting: The bike is equipped with a reliable Shimano GRX 1×11-speed mechanical drivetrain . The GRX 812 long-cage rear derailleur is gravel-specific, featuring a clutch mechanism for a stable, quiet chain on rough terrain .
Crankset: Power transfer is handled by a Shimano GRX crankset with a 40T chainring, offering a perfect balance for mixed-terrain riding. For the 56cm frame, the crank arms are sized at 172.5mm to ensure an optimal and comfortable pedaling fit .
Cassette: The wide-ranging SRAM Powerglide 11-42T 11-speed cassette provides the low gears needed to spin up steep gravel climbs .

Cockpit and Finishing Kit

Handlebar & Stem: This model features a 3T carbon flatbar LTD, providing a more upright and confident riding position perfect for technical descents, bikepacking, and urban commuting, while boosting visibility and control . It’s paired with a 3T Apto Stealth stem, sized at 100mm for the 56cm frame to ensure a stable and responsive fit .
Seatpost: The proprietary 3T Charlie Sqaero Team seatpost (with Ritchey WCS clamp) offers a perfect balance of aerodynamic shaping and rider comfort .
Saddle: Comfort is provided by either a Selle Italia Novus Evo Boost Superflow or a WTB SL8 saddle, depending on availability, both designed for long-distance comfort .

Brakes

Confident and consistent stopping power comes from Shimano GRX hydraulic disc brakes (BR-RS405) . These gravel-specific brakes offer excellent modulation and power in all conditions, paired with 160mm rotors front and rear for reliable stopping force on steep descents .

Wheels and Tires

Wheelset: The bike rolls on a premium 3T Discus 45|40 wheelset. These are lightweight, tubeless-ready carbon rims designed for mixed-terrain speed and durability .
Tires: It is fitted with high-performance gravel tires, either Pirelli Cinturato Gravel M (700x37c) or Panaracer GravelKing TLC (700x41c), depending on availability. These tires offer a superb blend of low rolling resistance on pavement and confident grip on loose gravel .

Sizing: The “56cm” Fit

This size 56cm frame is specifically engineered for riders seeking a balanced, confident, and performance-oriented fit .

Rider Height: Designed to fit riders approximately 178cm to 183cm (5’10” to 6’0″) tall .
Key Geometry (Size 56cm):
- Stack: 584 mm
- Reach: 385 mm
- Head Tube Angle: 72.0°
- Seat Tube Angle: 73.0°
- Chainstay Length: 415 mm
- Wheelbase: 1014 mm

Why This Bike?

The 2024 3T Exploro RaceMax Boost GRX Flatbar is for the rider who wants it all: the speed and handling of a world-class gravel bike, the versatility of a flat-bar setup, and the subtle, extended-range magic of a lightweight electric assist system . It’s a machine that “rides like a quick gravel bike with a flatbar stance that’s confident on fast descents and composed on choppy tracks”