3t Ultra Boost Eagle AXS Flatbar 650b
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 Boost Eagle AXS Flatbar 650b takes 3T's Exploro Ultra carbon platform — engineered around aero tube shapes and a pure-road-length carbon fork — and orients it toward the rougher end of mixed-terrain riding. Where the drop-bar versions of the Ultra Boost are built around speed on fast gravel and open roads, the flat-bar 650b configuration is built for riders who want access to more technical terrain. The flat handlebar and wider 650b wheels are the two choices that define this bike's character, and both serve the same underlying goal: a capable, confident gravel eBike for rides where pavement is the exception.
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3T's Realfast aerodynamic architecture is present throughout the chassis. The wide downtube shields the water bottle from oncoming airflow while redirecting air around the rider — a design choice that holds its value whether you're on pavement or gravel. A close-fitting rear wheel cutout keeps the frame profile tight. Double drop chainstays provide lateral stiffness without compromising tire clearance; the Pirelli Cinturato Gravel M tires that come standard measure 650b x 50mm. The aero seat tube accepts dropper posts, which is a relevant detail on a bike that will regularly encounter technical descents. Frame construction is unidirectional pre-preg carbon with a high-modulus/high-strength performance blend layup, and the fork is 3T's Fango RaceMax Integrale with a compact crown.
The geometry is tuned for the flat-bar 650b mission. Head tube angle is notably slack in the smaller sizes — 68.5° at 48cm, stepping up to 72.5° at 56cm and above — which gives the front end a stable, planted feel on loose surfaces. The 74° seat tube angle is consistent across all sizes, and 419mm chainstays run uniform throughout the range. The 3T Flatbar LTD runs 700mm wide with a 9° sweep and 30mm of rise, keeping the rider upright and in control. The 3T Apto Stealth stem is sized by frame: 80mm in S, 90mm in M, 100mm in L, 110mm in XL.
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