Gravis
A legacy reimagined. Innovation at its core.
Gravis is the perfect fusion of LUG's rich heritage and modern innovation. It combines the timeless elegance of LUG's classic craftsmanship with cutting-edge design and geometry, creating a folding bike that both honors tradition and leads the way into the future. While prioritizing lightweight and convenience, Gravis retains the warmth and depth of craftsmanship, allowing riders to still feel the elegant legacy of a century-old tradition.
Your bike already arrives 95% built. We give you the tools. And simple instructions. No technical skills needed.
Free frame replacement for natural cracking under normal riding conditions (non-impact related).
LUG housing craft originated in Europe, with brands like Colnago, Bianchi, Cinelli, Pinarello, and De Rosa known for their LUG and steel frames, representing the peak of steel frame craftsmanship. In the U.S., Rivendell is famed for silver brazed LUGs and retro geometry. In Japan, TOEI, and in the UK, Mercian, are renowned for hand-carved LUGs and custom paint, making them highly coveted by collectors. Today, many brands are reviving these classic designs, solidifying LUGs as a symbol of high-end craftsmanship.
Compared to direct welding, the LUG housing process makes it easier to maintain consistency during frame production and allows for the use of lightweight steel tubes. LUG housing offers a larger contact area and precise angle control, making the frame connections more solid and reliable.
LUG Craftsmanship: Where Tradition Meets Modern Design
LUG craftsmanship blends tradition with modernity, elevating folding bicycles with its intricate design and artistic details. It preserves the elegance of classic steel frames while adding a timeless charm to urban cycling.
4130 High-Strength Steel
Made from 4130 steel (C0.28-0.33%, Cr0.8-1.1%, Mo0.15-0.25%, balance Fe), this low-to-medium carbon chromium-molybdenum alloy offers excellent strength and toughness. After heat treatment, its yield strength reaches 560-700 MPa and tensile strength can go up to 700-900 MPa, combining high strength with great durability.
Compared to aluminum alloys like 6061-T6 (tensile strength around 310 MPa), 4130 steel offers more stable performance under impact and fatigue loads. Its excellent weldability and machinability make it an ideal material for complex and precise frame structures, especially for high-end road and folding bike frames.
Stopping Power: CNC Machined Aluminum Hydraulic Disc Brakes
Precision-engineered for optimal performance, these CNC-machined aluminum hydraulic disc brakes offer superior stopping power and control. Built for durability and responsiveness, they ensure smooth braking even in demanding conditions, providing a safe and reliable riding experience.
Bike Configuration List
| Artículo | Especificación |
|---|---|
| Cuadro | Cuadro de acero Cr-Mo 4130 con construcción LUG |
| Potencia plegable | Potencia plegable de aluminio forjado de una pieza |
| Puesto de mando | Manillar y tija de sillín forjados 6061-T6 |
| Bielas | Monoplato ligero de aluminio forjado de 44 dientes |
| Cambio | MicroShift Advent 1 X 9S |
| Cassette | Ligero de 9 velocidades 11-34T? |
| Frenos | Sistema de freno de disco hidráulico integrado de aluminio forjado mecanizado CNC con doble pistón – 160 mm delantero / 140 mm trasero |
| Juego de ruedas | Buje de aluminio forjado de alto pulido + Llanta de aluminio de doble pared con unión de manguito, 24 radios |
| Neumáticos | Neumáticos de bicicleta de montaña CST de 20*1.95 pulgadas, color Skinwall |
| Artículo | Especificación |
|---|---|
| Cuadro | Cuadro de acero Cr-Mo 4130 con construcción LUG |
| Potencia plegable | Potencia plegable de aluminio forjado de una pieza |
| Puesto de mando | Manillar y tija de sillín forjados 6061-T6 |
| Bielas | Monoplato ligero de aluminio forjado de 44 dientes |
| Cambio | MicroShift Advent 1 X 9S |
| Cassette | Ligero de 9 velocidades 11-34T? |
| Frenos | Sistema de freno de disco hidráulico integrado de aluminio forjado mecanizado CNC con doble pistón – 160 mm delantero / 140 mm trasero |
| Juego de ruedas | Buje de aluminio forjado de alto pulido + Llanta de aluminio de doble pared con unión de manguito, 24 radios |
| Neumáticos | Neumáticos de bicicleta de montaña CST de 20*1.95 pulgadas, color Skinwall |
Crafted for those who value artistry and innovation, the 4130 chromoly steel frame combines legendary toughness with advanced LUG copper brazing. Skilled artisans use molten copper to forge a bond of unmatched strength, leaving behind intricate, hand-crafted details that elevate the traditional road bike legacy to new heights in folding bike design.
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