BOMBTRACK Audax - Metallic Dark Brown

The Bombtrack Audax Metallic Dark Brown is a steel allroad/endurance bike designed for long-distance comfort and confident handling on mixed terrain. The Columbus Cromor double-butted frame delivers the unmistakable ride feel of steel – smooth, stable and reassuring – while the full-carbon fork adds precision and offers multiple mounting points for fenders and cages.

Shimano GRX 2×11 components, hydraulic disc brakes and 650B wheels with high-volume tyres make this bike a solid choice for brevets, light touring and everyday allroad riding.

WHY IT’S AN AUDAX

• Columbus Cromor double-butted steel frame: modern steel tubing tuned for comfort, durability and intensive use.
• Full-carbon fork with mounts for fenders and cages – ideal for travel, commuting or randonneuring setups.
• Shimano GRX 2×11 drivetrain: gravel/allroad-specific ergonomics with smooth, reliable shifting.
• 48 / 32T sub-compact chainrings + 11–34T cassette: versatile gearing for long climbs, fast flats and rolling terrain.
• 650B wheels with 47C tyres: enhanced comfort and grip on broken tarmac, backroads and light gravel.
• T47 86.5 mm bottom bracket shell: modern, stiff and service-friendly standard.

KEY STRENGTHS

• Endurance/allroad geometry focused on stability, control and comfort over long distances.
• Shimano GRX hydraulic disc brakes for powerful, modulated braking in all weather.
• Extensive mounting points on frame and fork for racks, fenders, lights and bikepacking bags.
• Tyre pairing with WTB Byway + Horizon 650B × 47C for a blend of speed and comfort.
• Internal light cable routing and rear light mount designed for real-world, daily use.

SHORT DESCRIPTION

The Audax Metallic Dark Brown is a steel endurance/allroad bike focused on comfort, versatility and reliability. It’s an excellent choice for randonneuring, long-distance rides, light touring and mixed-surface routes across asphalt, backroads and smooth gravel.

IDEAL FOR

• Light gravel and smooth dirt roads.
• Brevet events, long-distance and endurance rides.
• Minimalist touring with soft bags or light racks.
• Year-round commuting with optional fenders and luggage.
• Riders wanting a single, do-it-all steel allroad bike.

TECH SPECS (Summary)

• Frame: Columbus Cromor double-butted, TA, rack / fender mounts, internal light cable routing, rear light mount, 86.5 mm T47 BB shell.
• Fork: Full carbon, TA, 1.1/2'' – 1.1/8'', with fender / cage mounts.
• Drivetrain: Shimano GRX 2×11 (ST-RX600 shifters, FD-RX810, RD-RX810 clutch rear derailleur).
• Crankset: Bombtrack Lyer, forged aluminium, direct mount interface, 30 mm spindle, 48 / 32T.
• Cassette: Shimano 105 CS-HG700-11, 11–34T.
• Brakes: Shimano GRX BR-RX400 hydraulic disc brakes, 160 mm rotors.
• Wheels: WTB ST i25 TCS 2.0 rims with Bombtrack Tau hubs, 650B.
• Tyres: WTB Byway TCS 650B × 47C front, WTB Horizon TCS 650B × 47C rear, tubeless ready.
• Seatpost: Ritchey Comp aluminium 27.2 × 400 mm.
• Approx. weight: 10.8 kg (size M).

TYRE CLEARANCE (official)

• Frame – max without fenders: 650B × 47C / 700C × 35C.
• Fork – max without fenders: 650B × 50C / 700C × 35C.

TECHNICAL INTERPRETATION

The Audax is tuned for efficiency and comfort over long distances, with a clear allroad focus:

• In 650B configuration with tyres up to 47–50 mm, the bike prioritises comfort, grip and stability on rough tarmac, backroads and light gravel.
• In 700C mode with tyres up to 35 mm, it becomes faster and more road-oriented, ideal for long, smooth endurance routes.
• The multi-mount carbon fork allows compact, practical light-touring and commuting setups without compromising handling.

In practice, the Audax can be built as a more road-biased endurance bike with 700C wheels, or as a comfort-oriented allroad bike with 650B wheels – all from the same Columbus steel platform.

RIDER FIT – SIZE GUIDE

• XS: 150–161 cm
• S: 160–171 cm
• M: 170–181 cm
• L: 179–190 cm
• XL: 188–199 cm

For precise size advice, just email us your height and inseam – we’ll reply within 24 hours with realistic, rider-focused guidance.

RECOMMENDED SETUPS

• Endurance/allroad fast: 700C × 32–35 mm, with fenders and small bags (handlebar + saddle).
• Allroad comfort: 650B × 47C (stock) or up to the frame/fork limits for maximum comfort and traction.
• Light touring / bikepacking: frame bag + handlebar roll + saddle bag, plus optional rear rack.
• Four-season commuting: full fenders, dynamo lights, and practical luggage options.

METALLIC DARK BROWN COLOUR

Only after understanding the technical package does the finish truly stand out: the Metallic Dark Brown paint is one of the most striking aspects of this Audax. A deep, sophisticated metallic brown that shifts subtly with the light and highlights the curves of the steel frame.
It’s a warm, rich tone for riders who want a bike that feels discreet yet full of character. The colour pairs naturally with black, sand, olive and brighter bag colours, always keeping a premium and well-balanced look. A perfect choice if you see your bike as a long-term travel companion rather than a disposable object.

WHY BUY FROM US

• Fast, tracked express shipping.
• Italian/English customer support.
• Honest, rider-focused advice on sizing, setup and use.
• Email replies within 24 hours.

FINAL CTA

Ready to ride far on tarmac, backroads and mixed routes?
Add the Bombtrack Audax – Metallic Dark Brown to your cart.
Want to discuss options before ordering? info@bikejamming.it

SPECIFICATIONS

BUILD INFOS

GEOMETRY

¹ The bike size recommendation is intended as a general guideline to narrow down options based on rider height. Bike fitting is a complex topic and also depends on other body measurements and personal preferences. Since no two riders are exactly alike, it is impossible to provide a 100% accurate recommendation for everyone. The best way to determine the ideal size is to consult your Bombtrack dealer (info@bikejamming.it) or a professional bike fitter.