Description Altera: Gravel From The Future What's NewMore 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 GeometrySlacker 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 SolutionsInternal 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 ClearanceSupports 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 QCCareful 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 & OptimizationThe 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 SeatpostNow 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 ShellA 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 SystemWith 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 QualityThis is how we know that Altera G21 is the gravel bike everyone needs and everyone deserves Specification Including Parts: G21 Frame, Fork, Handlebar, SeatpostFrame Size: 45cm, 49cm, 52cm, 54cm, 56cm, 58cm, 60cmMaterial: High Modulus Toray 800 Carbon FiberColor: ChampagneBB: BB T-47 inboard bearing(Pick the right BB depending on your crank spindle size)E.g. If you are using a GRX crank: T47 BB inboard bearing for (Shimano) 24mm spindle size.SRAM DUB / DUB wide crank: T47 BB inboard bearing for SRAM DUBSRAM GXP: T47 BB inboard bearing for SRAM GXPBB Width: 86.5mmHeadtube: Straight 1-1/2”Rear Dropout: 12*142 Thru AxleRear Derailleur Hanger: UDH - ReplaceableFrame Weight:Champagne 1170g (56cm)±50gRaw 1150g (56cm) ±50g Fork: 1 1/8" - 1 1/2", 12*100 Thru AxleFork Weight: 480g (painted, 56cm frame)Tapered Steerer Tube: 1 1/8" Top, 1 1/2" CrownSeatpost Weight: 95.2g (without clamp)Seatpost Shape: Round (27.2mm)Compatibility:Chainring: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.Brake Fitment: Flat Mount DiscCable Routing: InternalBottle Mounts: 4Mudguard Compatible: YesCargo Rack Compatible: YesMax Tire Width: 700X53mm, 650BX2.1” (single chainring setup)Accessories: Handlebar Spacers 3mm: 1 pc, 5mm: 1 pc, 10mm: 2 pcs, Headset Bearing Cap 10mm: 1 pc, Front Axle: 1 pc, Rear Axle: 1 pcLimited Rider Weight: 125KGWarranty: 6 Years G21's Frame GeometryGravel Optimized. Outstanding Stability. 45495254565860Size RecommendationRider Height160cm–168cm165cm–175cm172cm–180cm177cm–185cm182cm–190cm187cm–196cm193cm–201cmASEAT TUBE LENGTH (mm)450490520540560580610BTOP TUBE LENGTH (mm)510515536.4551566577592CREACH (mm)373373379383387390396DSTACK (mm)512531549566586611640EHEAD TUBE LENGTH (mm)7998.5107134145171200FSEAT TUBE ANGLE75°75.0°74.0°73.5°73°73.0°73.0°GHEAD TUBE ANGLE69°69.5°70°70°72.2°72.3°72.6°HBOTTOM BRACKET DROP (mm)79797979797979ICHAIN STAY LENGTH (mm)433433433433433433433LFORK RAKE (mm)47474747474747MFORK LENGTH (mm)401.5401.5401.5401.5401.5401.5401.5 Optional for H21 Intergrated Handlebar ($170.00) Handlebar Type Gravel Bike / Road Bike Handlebar Handlebar Material 100% Carbon Fiber T800 Finish UD Matt Decal Black Glossy Handlebar Stem 80/90/100/110mm Handlebar Width 400/420/440mm Angle 10.2° Reach 80mm Drop 120mm Steer Diameter 28.6mm Compatible Cable Type Inner Cable / Outer Cable Weight 376g ± 15g Comes with Computer Holder, Spacers for rounded 1-1/8 inch (28.6mm) steerer, Top cap and outer cable bearing cover. Standard EN Standard
