YOELEO
Altera G21 DB Gravel Bike Frameset
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Specifications of Altera G21
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UCI Approved
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Yes
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Parts Included
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G21 Frame, Fork, Handlebar, Seatpost
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Frame
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Size
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45cm,49cm, 52cm, 54cm, 56cm, 58cm, 60cm
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Material
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High Modulus Toray 800 Carbon Fiber
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Color
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Champagne
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BB
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BB T-47 inboard bearing
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- GRX crank: T47 BB inboard bearing for Shimano 24mm spindle size
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- SRAM DUB / DUB wide crank: T47 BB inboard bearing for SRAM DUB
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- SRAM GXP: T47 BB inboard bearing for SRAM GXP
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BB Width
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86.5mm
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Headtube
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Straight 1-1/2”
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Rear Dropout
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12*142 Thru Axle
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Rear Derailleur Hanger
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Universal Derailleur Hanger (UDH) - Replaceable
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Frame Weight
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Champagne 1170g (56cm)
Raw 1150g (56cm)
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Handlebar
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H21 carbon integrated handlebar
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Handlebar Size
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400mm, 420mm, 440mm
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Stem Size
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80mm, 90mm, 100mm, 110mm
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Handlebar Weight
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360+/-15g (420x90)
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Fork & Seatpost
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Fork
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1 1/8" - 1 1/2", 12*100 Thru Axle
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Fork Weight (Painted, 56cm frame)
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480g
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Seatpost Weight
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95.2g (without clamp)
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Seatpost Shape
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Round (27.2mm)
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Compatibility
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Chainring
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- Single: Max of 42t for normal crank spindle and 44t for wide crank spindle
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Brake Fitment
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Flat Mount Disc
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Cable Routing
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Internal
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Bottle Mounts
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4
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Mudguard Compatible
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Yes
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Cargo Rack Compatible
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Yes
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Max Tire Width
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700x53mm, 650Bx2.1” (single chainring setup)
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Accessories
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Handlebar Spacers
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- 3mm: 1PC
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- 5mm: 1PC
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- 10mm: 2PCS
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Headset Bearing Cap
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10mm: 1PC
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Front Axle
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1pc
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Rear Axle
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1pc
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Limited Rider Weight
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125KG
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Warranty
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6 Years
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Warranty
Standard Coverage: 6-year warranty
Extended Option: AdditionalLifetime warrantyavailable for US$300
Crash Replacement Policy
YOUR SAFETY MATTERS
While we sincerely hope you won't require it, we provide a 30% crash replacement discount on all handlebars and spares in the unfortunate event of a crash. Reach out to us, and we'll strive to assist you promptly, ensuring you can get back on the road and ride again as soon as possible.
A step above perfection
G21 Altera, the best gravel with endless capabilities.
Altera: Gravel From The Future
More storage, more flexible, more comfort, more control and more of everyhing. If G21 has the answer to your questions, the G21 Alterra has the answer and more.
Refined Gravel-Optimized Geometry
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.
Premium Detailing and QC
Careful quality checks and a clean, high-level paint finish give you the kind of value you don't usually find at this price.
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.
Assuring Altera G21's Quality
This is how we know that Altera G21 is the gravel bike everyone needs and everyone deserves
Two Fork Options
Whether you opt for a fork with holes or without, the choice is yours to make based on your bikepacking needs. The fork with holes provides added versatility, allowing for front load attachment and pannier installation, perfect for those seeking to carry more luggage. Whether you prefer a minimalist setup or a fully-equipped adventure, the decision is in your hands.
Integrated or With Stem
It's all up to you to lead your way. Choose between the integrated H21 or the ST1+H25 stem with handlebar option for the G21.
H25
Integrated Handlebar
Stem+Bar
ST1+H25
Gravel Optimized. Outstanding Stability.
G21's Frame Geometry
| Size | A | B | C (Reach) | D (Stack) | E (Headtube) | Seat tube angle (F) | Head tube angle (G) | Front center (K) | Rake (L) | Fork (M) | SO | Wheelbase (K) |
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| 45cm | 490 | 510 | 373 | 512 | 79 | 75°0 | 69 | 595 | 47 | 401.5 | 730 | 1028 mm |
| 49cm | 490 | 515 | 373 | 531 | 90 | 75°0 | 69.5 | 601 | 47 | 401.5 | 760 | 1034 mm |
| 52cm | 520 | 536.4 | 379 | 549 | 107 | 74°0 | 70 | 605 | 47 | 401.5 | 780 | 1038 mm |
| 54cm | 540 | 551 | 383 | 566 | 126 | 73.5°0 | 70 | 615 | 47 | 401.5 | 796 | 1048 mm |
| 56cm | 560 | 566 | 387 | 586 | 145 | 73°0 | 71 | 625 | 47 | 401.5 | 816 | 1062 mm |
| 58cm | 580 | 577 | 390 | 611 | 171 | 73°0 | 71 | 631 | 47 | 401.5 | 840 | 1074 mm |
| 60cm | 610 | 592 | 396 | 640 | 200 | 73°0 | 71 | 634 | 47 | 401.5 | 870 | 1090 mm |
Be Yourself Project
From glossy to matte finishes, simple or complex patterns, we’ll bring your ideas and creativity to life!
Explore the magic of our gradation option that smoothly transitions between two color choices, creating a beautiful, gradual color fade on your frame.
Decals color options : Silver, White, Black.
It is for those who appreciate the dynamics of color interplay and aren't afraid to break the norms in pursuit of their individual style.
Decal color options: Silver, White, Black
Embrace simplicity with our single-color paint option. Make a statement with just one bold, vibrant color.
Decal color options : Silver, White, Black
Ask our designer to collaborate for fully customized design. Turning your artistic vision into a riding masterpiece
Understanding Our Product
Find answers to your questions about our product here:
Tire Compatibility
The G21 accommodates a 53c gravel tire or a 2.0 MTB 29 tire. Select the right tire to enhance your ride's performance and comfort based on the terrain you're tackling.
Chainring Options
- Single: Fits up to 42T for standard cranks and up to 44T for wide crank spindles.
- Double: Accommodates a maximum of 50-34T with a BB to Crank washer.
Bottom Bracket Specs
- Our G21 uses a BB T-47 inboard bearing. Choose based on your crank spindle size:
Shimano GRX Crank: T47 BB inboard bearing for a 24mm spindle. - SRAM DUB / DUB Wide Crank: T47 BB inboard bearing for SRAM DUB.
- SRAM GXP: T47 BB Inboard bearing for SRAM GXP.
Fork Customization
Opt for a fork with mounting holes for front panniers or choose a seamless fork for improved aerodynamics.
Stem and Handlebar Combo
Yes, you can use a stem and handlebar combo. We recommend our ST1 stem with the H25 handlebar for a seamless integration.
Our Core Values
At the core of our company lie the values of self-discipline and freedom, driving us forward and fueling our passion for cycling. We believe that cycling is more than just a sport; it's a way to push beyond our limits, discover our inner strength, and achieve greatness. Since the beginning, we've been committed to these values, delighting our customers with a variety of cycling disciplines designed with a fun and progressive lifestyle in mind.
