Bombtrack Audax

Bombtrack’s supremely versatile all-road bike


The Bombtrack Audax is possibly the most versatile and supremely capable all-road bike that you can find – it refuses to be bound by convention, and is perfectly at home switching back and forth from pavement to dirt and gravel without missing a beat. A robust, refined and adaptable Columbus Cromor frame is the starting point. With through-axles and a wide threaded bottom bracket, it should survive a lifetime of intense use, as will its lightweight full carbon adventure fork.  Subtle tweaks like the inclusion of an integrated rear light mount and internal cabling for 2021 help keep it bang up to date.

With all the fixing you could need to secure your gear, the Audax frameset can be built up with a choice of 650B wheels with large volume tyres or 700C wheels with (still large) road-orientated tyres.  The voluminous size of 650Bs keeps rolling resistance low, yet allows the Audax to swoop across a range of surfaces from paved roads to gravel tracks. While the 700C option offers an extra responsive and ultra smooth ride over less aggressive surfaces.

“If you’re in the market for a bike primed for bikepacking and gravel riding, you’d be forgiven for thinking Bombtrack’s Audax range doesn’t tick the relevant boxes. But don’t be misled by the name, which suggests long distance, road-based randonneuring… because these bikes can do a whole lot more than that”

Available either as a Bombtrack factory built bike or as a frameset for building up with groupset, finishing kit and wheels of your choice (see below for some examples).

The Bombtrack Audax frame is built from premium Columbus Cromor tubing, with a tapered head tube, through axles, and rack and fender mounts.  For long distance riding, steel is arguably the best material for the job. Its natural resonance dampens road buzz and produces a ride so compliant that it’s more akin to floating than rolling. Complete with triple cage mount on down tube for optimized bottle position, bottle cage mounts underneath the down tube and on the seat tube, and full carbon fork with bottle cage mounts.

“The Audax, however, makes a very compelling package, with its clearance for both large-volume supple tyres or knobblies, and a classy steel frame and an all-carbon fork with modern TA standards. With its wide gear range and small jumps between them – compared to a 1x drivetrain, at least – the Audax is an all-road bike that can do a whole lot more.”  BIKEPACKING.COM

As well as the standard Bombtrack factory-built full bike, we are also able to offer a full custom specification with the Audax; starting with a bare frameset we can build you a full bike using components of your choice (see below for some examples).

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2021 Bombtrack Audax


Key Features:

  • Frameset:  COLUMBUS CROMOR double butted frame with full carbon disc fork
  • Groupset:  Shimano 105/Ultegra mix 2x hydraulic disc
  • Wheelset:  WTB ST i25 650B with WTB Byway front and WTB Horizon rear 47c tyres – available with our famous Epic Wheel Upgrades for enhanced performance at outstanding prices.
  • Maximum Tyre Clearance:  Front – 650B x 50C / 700C x 35C; Rear – 650B x 47C / 700C x 35C

Availability:  Next unsold stock due June/July

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
Handlebar: RITCHEY COMP STREEM III drop bar, 31.8 mm, 5° backsweep
Stem: RITCHEY COMP 4-AXIS 44 forged aluminium stem, -6°
Headset: Sealed external aheadset, 1.1/2” – 1.1/8”
Levers: SHIMANO 105 ST-R7020 STI hydraulic
Shifter: SHIMANO 105 ST-R7020 STI 2 x 11
Brakes: SHIMANO 105 BR-R7070 flat-mount hydraulic disc brakes with 160 mm rotors
Crankset: BOMBTRACK LYER forged aluminium crank, direct mount interface (SRAM compatible), 30 mm spindle
BB: BOMBTRACK T47 internal sealed BB for 30 mm spindle
Pedals: n/a
Chain: KMC X11 EPT Anti Rust chain, 1/2” x 11/128”, 114L
Chainring aluminium, subcompact, 48 / 32 T, direct mount spider
Cassette: SHIMANO 105 CS-R7000 11-speed, 11 – 34 T
Front derailleur: SHIMANO 105 FD-R7000
Rear derailleur: SHIMANO ULTEGRA RD-RX800-GS, clutch, medium cage
Front hub: BOMBTRACK TAU sealed disc hub, 12 x 100 mm thru-axle
Rear hub: BOMBTRACK TAU sealed disc hub, 11-speed, 12 x 142 mm thru-axle
Front rim: WTB ST i25 double wall, TCS 2.0, 32h
Rear rim: WTB ST i25 double wall, TCS 2.0, 32h
Saddle: BOMBTRACK COMP saddle
Seat post: RITCHEY COMP 2-BOLT aluminium seatpost 27.2 mm x 400 mm
Seat clamp: BOMBTRACK ORIGIN forged aluminium seat clamp, 29.8 mm
Front tyre: WTB BYWAY TCS 650B x 47C, tubeless ready
Rear tyre: WTB HORIZON TCS 650B x 47C , tubeless ready