Riding into the future of gravel biking, the Altera G21 is our newest masterpiece. Packed with optimized features for an unbeatable gravel and adventure riding experience, the Altera G21 stands tall as a testament to our commitment to innovation, performance, and rider-centric design. All-Terrain Capabiility
The Altera G21 seamlessly combines speed, stability, and comfort, empowering you to conquer challenging terrains and embark on journeys where every turn is a new discovery. Embrace the freedom to race, explore, and conquer with the G21.
G21 Altera, the best gravel with endless capabilities
More storage, more flexible, more comfort, more control and more of everyhing. If G21 has the answer to your questions, the Alterra G21 has the answer and more.
Slacker headtube angle, longer wheelbase, and a shorter stem come together for better stability and control on rough terrain—without the worry of toe overlap.
Integrated Storage Solutions
Internal storage compartments on the top tube and down tube (with a built-in bag) let you pack more gear for extended rides or simply stash a day’s worth of essentials directly in your frame.
Generous Tire Clearance
Supports up to 700x53mm or 650Bx2.1” tires (single chainring). From fast gravel to rugged trails, Altera adapts to the ride you want.
UDH Compatibility & Optimization
The Universal Derailleur Hanger (UDH) adds an extra layer of security and flexibility. Ride confidently knowing your derailleur and frame are protected, and choose any groupset you prefer with UDH’s universal fit.
Introducing the YOELEO Pro-Flex Seatpost
Now featuring a 27.2mm round profile, the Pro-Flex Seatpost quickly absorbs road buzz for improved comfort. The round design also makes it easy to switch to a third-party seatpost if desired—or even upgrade to a dropper seatpost. This change from the previous D-shaped configuration opens up more possibilities for every rider.
Re-Engineered BB Shell
A threaded bottom bracket made from bonded aluminum is now molded into the frame—offering perfect alignment, improved durability, and a lighter overall build for a smoother ride experience.
Flared Cockpit System
With a 15.2° flare and widths from 400 to 440mm, H21 CARBON INTEGRATED HANDLEBAR offers better control and all day comfort. Perfect for gravel, adventure, and aggressive terrain.
ProMoldCore Technology
The conventional manufacturing method that is still common practice with most companies today brings a lot of issues. Conventional methods causes undulations on the internals of the frame and even increases weight, making it difficult to achieve performance according to the specified carbon sheet specifications.Unlike traditional methods such as nylon bladders, ProMoldCore manufacturing technology allows for a more stable molding of the inside of the frame thanks to latex's flexibility and stretchability.We believe that inside out beauty applies for everything, especially for our framesets. By utilizing ProMoldCore technology, the outside and inside of a carbon road frame are of the same quality, resulting in an inner surface that is as smooth and wrinkle-free as the outer surface.The use of latex increases the pressure of the molded latex bag, smoothing the internal finish, improving the compressibility of the compound, reducing resin waste, and allowing for more complex shapes to be made.
ProMoldCore and ProOne Technology
CRAFTED WITH PROMOLDCORE
In the same vein, the implementation of ProMoldCore in fabricating our handlebars has earned them renown for their stiffness. Experience hassle-free cable installation as the latex molds the bar's interior, ensuring a seamless cable routing installation with a sleek, smooth finish inside out. ProOne Technology: One-piece, no-bond manufacturing utilizes high-grade carbon fiber and YOELEO precision layup technique to eliminate the added weight and flex found in traditionally bonded bars.
Integrated or Stem & Bar Combo
Ride with H21, easy to install and hassle-free integrated handlebar, or with H25 and ST1, easy to adjust bar and stem combination that allows for freedom.
