3t Ultra GRX
In stock at 1 shop in New York City
Prices and stock checked Oct 22.
Where to buy
1 shopAbout this bike
The 3T Ultra GRX Bike is 3T's aerodynamic all-terrain gravel platform — a complete bike built around the premise that speed on mixed surfaces comes from optimizing the whole system around the tire, not in spite of it. At $4,399, it pairs 3T's Realfast aero carbon frame with a Shimano GRX 12-speed 1x drivetrain, Fulcrum Rapid Red 900 wheels, and Pirelli Cinturato Gravel tires in a build designed to go fast wherever the road runs out.
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Realfast Aerodynamics
The Ultra's defining engineering idea is that the frame's aerodynamics were designed around the tire's actual dimensions, not around a narrow road profile. Using hundreds of real-world tire measurements, 3T developed Realfast aerodynamics — a frame geometry and tube shaping approach that manages airflow around the real outer diameter and width of the tire rather than working against it. The most visible expression of this is the downtube, which measures 60mm wide and flares outward to 75mm as it approaches the bottom bracket. This shape shields the water bottle from direct airflow and optimizes the air transition from the downtube and tire into the bottom bracket area, reducing drag at the point where a wide tire would normally create a significant aerodynamic penalty.
The frame is built from a unidirectional pre-preg carbon layup using a high-modulus/high-strength performance blend. The seat tube is aero-profiled and mates with a 3T carbon 27.2mm round seatpost — a diameter deliberately chosen for its natural compliance and broad compatibility with dropper and suspension posts. Double-drop chainstays open clearance for wide tires and larger cranks simultaneously, handling a practical tradeoff that most gravel frames have to make less gracefully. A threaded bottom bracket and integrated fender mounts add everyday usability. The fork is the 3T Fango RaceMax Integrale with a compact minimalist crown, shaped for aerodynamic efficiency while maintaining the compliance character of the platform.
Tire Versatility
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