Bombtrack Audax

$2999.99

In Stock

The Bombtrack Audax blends classic Columbus Cromor steel with modern gravel geometry — full-carbon fork, 650B x47 tubeless tyres and Shimano 105 hydraulic disc groupset for fast, comfortable adventure riding.

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Product Details

Overview & Technology

Bombtrack Audax pairs a Columbus CROMOR double-butted steel frame with a full-carbon fork to deliver a lively, compliant ride that still responds sharply when you push the pace. The CROMOR tubing offers proven durability and predictable flex characteristics; double-butting keeps weight down while preserving strength at the joints. The Audax is built for long days and mixed surfaces: the fork features fender and cage mounts, the frame includes rack/fender bosses, internal light cable routing and a rear light mount. The 86.5 mm T47 bottom bracket shell and 30 mm spindle crank interface are engineered for stiffness and wide crank compatibility, while the tubeless-ready WTB rims and 650B x47 tyres prioritise traction and comfort on rough roads and gravel tracks.

Key Features & Component Highlights

Purposeful components: The spec reads like a practical, performance-focused build — Shimano 105 ST-R7020 hydraulic STI levers and BR-R7070 flat-mount calipers provide confident stopping power and modulation with 160 mm rotors. The drivetrain blends Shimano 105 cassette and front derailleur with an Ultegra clutch rear derailleur for precise shifting over varied terrain. • Bombtrack forged LYER aluminium crank with direct-mount interface (SRAM compatible), 30 mm spindle for stiffness and serviceability. • WTB ST i25 rims (TCS 2.0) laced to Bombtrack TAU sealed hubs — tubeless-ready and robust for loaded rides. • WTB Byway & Horizon 650B x47C tyres deliver lower-pressure traction and smoother rolling over rough surfaces.

Fit, Sizing & Compatibility

The listed bike is an XS frame in Sage with 650B wheels. Columbus CROMOR steel frames offer predictable handling across sizes; the Audax’s geometry is tuned for stability on mixed surfaces while retaining nimble steering for technical sections. The Ritchey Comp Streem III drop bar (31.8 mm, 5° backsweep) gives comfortable hand positions for long days in the drops or on the hoods. Compatibility notes: The T47 86.5 mm BB shell accepts a wide range of press-fit adapters and threaded T47 crank interfaces — the Bombtrack LYER crank uses a 30 mm spindle. Wheels are 650B with 32h rims; the frame and fork provide clearance for 650B x47C tyres and are tubeless-ready. Rack and fender mounts mean easy installation of touring or commuter hardware without frame modifications.

Who the Audax is For

The Audax is aimed at riders who want a versatile endurance/gravel bike that doubles as a light tourer. If you cover mixed surfaces — rough country lanes, gravel connectors, and tarmac — and value comfort for long distances plus the option to run racks or fenders, this bike fits that bill. It’s also well suited to riders who prefer the ride quality of steel but want modern features like internal cable routing, a stiff T47 BB platform for modern cranksets, and hydraulic disc brakes for all-weather confidence.

Key Features

✓ Columbus CROMOR double-butted steel frame with rack and fender mounts
✓ Full-carbon fork with fender/cage mounts for loaded gravel rides
✓ Shimano 105 hydraulic ST-R7020 levers and BR-R7070 disc brakes
✓ Bombtrack LYER forged aluminium crank, 30 mm spindle, SRAM compatible
✓ WTB ST i25 TCS 2.0 rims laced to Bombtrack TAU sealed hubs
✓ 650B x47C WTB Byway & Horizon tubeless-ready tyres for traction
✓ T47 86.5 mm bottom bracket shell for stiffness and wide compatibility

Specifications

Frame Size	XS
Color	Sage
Primary Color	Green
Wheel Diameter	650B

Product Identifiers

Vendor Item #	01125200121
EAN	4055822508131

Frequently Asked Questions

What wheel and tyre sizes fit the Audax?

The Audax in this listing comes shod with 650B x47C tyres and WTB 25mm internal rims. The frame and fork are designed to clear 650B x47 tyres and are tubeless-ready; you can run a range of 650B tyres (35–50mm) depending on rim width and mud clearance.

Can I mount racks and fenders to this frame?

Yes. The Columbus CROMOR frame and carbon fork include dedicated rack and fender mounts plus fork cage points. That makes the Audax suitable for light touring, bikepacking setups, or commuter fenders without aftermarket clamps.

What bottom bracket and crank compatibility should I expect?

The Audax uses an 86.5 mm T47 bottom bracket shell. T47 is compatible with many threaded adapters and modern 30 mm spindle cranksets. The stock Bombtrack LYER crank is direct-mount (SRAM compatible) with a 30 mm spindle; if you swap cranks, ensure the spindle diameter and chainline match your setup.

How durable are the wheels and hubs for mixed-surface use?

The bike ships with WTB ST i25 double-wall rims (TCS 2.0) and Bombtrack TAU sealed hubs — a robust, tubeless-ready combination designed for gravel and light touring. The 32h build offers a strong, reliable wheel for rough roads and loaded rides.

Is the Shimano 105/Ultegra mix a problem for service or shifting?

No. The spec pairs Shimano 105 11-speed shifters with a Shimano Ultegra RD-RX800 clutch rear derailleur and 105 cassette and front derailleur. Shimano 11-speed components are cross-compatible and this combination improves chain retention on rough terrain while keeping shifting crisp.

What is the bike’s weight and how does that affect handling?

The Audax is listed at 10.8 kg (frame size XS). The steel frame gives a comfortable, damped ride which slightly increases perceived weight but rewards with better compliance over long rides. You still get responsive handling thanks to the carbon fork and a well-specified component build.

Buying Guide

When choosing an adventure or gravel-style road bike like the Audax, prioritize tire clearance, mounting options and a stout bottom bracket platform. Steel frames (Columbus CROMOR here) deliver a forgiving ride for long days, while a carbon fork reduces front-end fatigue — a desirable balance for mixed-surface riding. Look for components that simplify maintenance and broaden capability: tubeless-ready rims and wider tyre clearance for low-pressure traction, 1x or wide-range 2x drivetrains for varied climbs, and hydraulic disc brakes for consistent stopping in wet conditions. If you plan to load the bike for multi-day trips, confirm rack and fender compatibility and choose a size that leaves room for comfortable standover and stack/reach suited to your posture.

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