The Chiru Vagus is a Grade 9 titanium gravel frame designed by the French brand Chiru Bikes to embody absolute versatility. Born for adventure and developed for La Baroudeuse Unpaved, this metallic wanderer is a concentrate of Chiru DNA: lightness, vibration damping, handling stiffness and extreme modularity. Whether you're preparing a multi-day bikepacking adventure or a fast gravel ride with friends, the Vagus adapts to your program thanks to its 700c or 650b wheel compatibility, integrated rack mounts and geometry designed for stability and efficiency on all terrains.

The ultimate all-round titanium gravel frame

The Chiru Vagus stands out with its cold-formed, variable-thickness 3Al/2.5V Grade 9 titanium construction, offering a perfect balance between lightness (1690 g in size M), targeted stiffness and natural vertical compliance. This noble material guarantees exceptional durability and unmatched vibration damping over long distances. The stable geometry, with its relaxed angles and generous wheelbase, inspires confidence on rough tracks, dirt roads and light gravel. The Vagus is compatible with a rigid or suspension fork (40 mm travel), and accepts tires up to 700c × 52c or 650b × 2.4" to adapt to all your playgrounds.

Versatility and modularity: your variable-geometry gravel bike

• Two wheel philosophies: Mount 700c × 47c for fast and responsive gravel rides, or switch to 650b × 2.1" for off-road bikepacking with more volume, comfort and load capacity.
• Integrated rack mounts: 3 bottle cages (3 × 750 ml), rack eyelets, top tube bag and frame bag — everything is designed for autonomy and long-distance exploration.
• Internal and external routing: Modular cabling (external under chainstays, internal in down tube) to adapt to all mechanical or electronic groupsets (Di2, AXS) in single or double chainring.
• Modern standards: T47 × 85.5 mm bottom bracket, 12 mm thru-axles, Flat Mount 160 mm brakes, SRAM UDH derailleur hanger for optimal compatibility with the latest gravel groupsets.

Geometry and technical features

The Chiru Vagus frame is based on a proprietary architecture with Chiru-specific headset and bottom bracket that provide lateral stiffness and handling precision. The optimized seatstays allow controlled horizontal flex to absorb bumps, while the down tube provides pedaling efficiency and ride comfort. Compatible with a Ø27.2 mm seatpost (including dropper), the Vagus offers fine position adjustment and additional vertical compliance. Five sizes (XS to XL) allow wheelbase, reach and stack adjustment for a perfect fit. The complete kit includes ZS56/44 headset, CEC titanium seat collar, titanium rear axle, titanium hardware and SRAM UDH hanger.

Available forks and customization

The frame is offered alone or as a kit with a choice of CEC carbon fork. The #400 fork (400 mm A-C, 450 g) accepts 700c × 45c or 650b × 2.1" and prioritizes efficiency on fast gravel. The #400W fork (400 mm A-C, 50 mm offset) extends compatibility to 700c × 55c or 650b × 2.4" for maximum comfort and increased load capacity for bikepacking. Both forks feature internal brake and dynamo routing, fender mounts and rack eyelets (3 kg/side). A titanium fork option #400T (730 g) is also available for purists seeking total material consistency and extreme resistance.

A French brand serving ultra-endurance

Founded in 2009 by Pierre-Arnaud Le Magnan, materials engineer and accomplished ultra-cyclist, Chiru Bikes has established itself as a reference for high-performance titanium bikes for adventure and ultra-endurance. Tested in the most extreme conditions (Silk Road Mountain Race, La Baroudeuse Unpaved, multi-day raids), Chiru frames combine exceptional craftsmanship, technical innovation and real-world experience. The Vagus embodies this philosophy: a reliable, durable and evolving tool, designed for those who push their limits and seek a bike capable of following them anywhere, for years to come.