• Bombtrack Audax – Steel Endurance Frameset
  • Bombtrack Audax – Steel Endurance Frameset
  • Bombtrack Audax – Steel Endurance Frameset
  • Bombtrack Audax – Steel Endurance Frameset
  • Bombtrack Audax – Steel Endurance Frameset
  • Bombtrack Audax – Steel Endurance Frameset
  • Bombtrack Audax – Steel Endurance Frameset
  • Bombtrack Audax – Steel Endurance Frameset

BOMBTRACK Audax Frameset - Metallic Dark Brown

€1,350.00 (Save €154.00)
€1,196.00
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The Bombtrack Audax Frameset is a Columbus Cromor steel platform built for fast all-road / endurance riding, long-distance use, and light touring, with a full carbon fork, T47 bottom bracket, and very practical real-world details. It is the right choice for riders who want to build a versatile road-oriented bike capable of handling tarmac, secondary roads, white roads, and year-round use, with a fuller and more forgiving ride feel than an aluminium platform.

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Bombtrack Audax Frameset

The Bombtrack Audax Frameset in Metallic Dark Brown is a steel frameset designed for fast endurance all-road riding, long-distance mileage, and light touring. A slim Columbus Cromor frame, a carbon fork, and a complete set of mounting points make it an ideal base for a real-world road bike: asphalt, secondary roads, white roads, and light gravel, with the option to add fenders and luggage.

Modern details such as internal light cable routing and an integrated rear light mount help create a bike that is clean, functional, and ready for everyday use or big days out in the saddle.

What the frameset includes

  • Frame: Columbus Cromor double butted, thru-axles, rack/fender mounts, internal light cable routing, integrated rear light mount, T47 bottom bracket shell (86.5 mm).
  • Fork: full carbon, thru-axle, tapered 1.5" – 1 1/8", fender mounts and cage mounts.
  • Headset: sealed external, 1.5" – 1 1/8".
  • Thru-axles: 12 × 100 mm (front) / 12 × 142 mm (rear).
  • Seatpost clamp: Bombtrack Prime 29.8 mm.

Intended use

Fast all-road & real-world road riding

Designed to roll well across many different surfaces, the Audax Frameset is perfect for long rides at a sustained pace, mixed routes, and roads that are not always perfect. The carbon fork improves comfort and precision, while Cromor steel delivers a solid and predictable ride feel.

Light touring and 365-day use

Rack and fender mounts plus light integration make this frameset a very sensible choice for fast commuting, winter rides, and light touring, without giving up a lively ride feel.

Wheel and tire choice (650B / 700C)

The Audax was designed around 650B wheels, but it also remains compatible with 700C within the stated clearances: the real difference comes from the tires and the type of terrain you ride most often.

Compatibility & build info

Item Details
BB standard T47 – 86.5 mm shell width.
Headset standard (S.H.I.S.) EC34 / 28.6 (upper) | EC44 / 40 (lower).
Headset crown race angle 36°.
Fork steerer inner diameter 23.6 mm.
Fork max tire clearance w/o fender 650B × 50C / 700C × 35C.
Frame max tire clearance w/o fender 650B × 47C / 700C × 35C.
Maximum chainring clearance 1x 44 teeth with 45 mm chainline.
Maximum chainring clearance 2x 53 / 39 teeth with 43.5 mm chainline.
Seat post diameter 27.2 mm.
Seat clamp diameter 29.8 mm.
Front derailleur clamp diameter 28.6 mm.
Frame front derailleur compatible yes.
Brake mount front flat mount 140 / 160.
Brake mount rear flat mount 140 / 160.
Maximum rotor clearance front 160 mm.
Maximum rotor clearance rear 160 mm.
Front through axle 12 × 100 mm, 1.5 thread pitch.
Rear through axle 12 × 142 mm, 1.5 thread pitch.
ISO testing standard Road.
Bike trailer approved.
Seat tube mounted child seat approved.
Derailleur hanger BT-DH-008.
Frame small parts BT-CR-007.
Front through axle (ref.) BT-TA-F-601.
Rear through axle (ref.) BT-TA-R-602.

Technical specifications – frame & fork

Component Details
Model Audax Frameset.
Colorway offered by Bikejamming Metallic Dark Brown.
Frame Columbus Cromor double butted, thru-axles, rack/fender mounts, internal light cable routing, integrated rear light mount, 86.5 mm T47 bottom bracket shell.
Fork full carbon, thru-axle, 1.5" – 1 1/8", fender mounts and cage mounts.
Headset sealed external, 1.5" – 1 1/8".
Thru-axles 12 × 100 mm (front) / 12 × 142 mm (rear).
Seatpost clamp Bombtrack Prime 29.8 mm.
Frameset weight 2410 g frame (size M, including TA and hanger) / 530 g fork (300 mm steerer tube, including TA).
Maximum rider + luggage weight 120 kg (including load).
ASTM riding conditions 2.
Note The final product may vary in appearance, finish, and some minor details.

Geometry & size guide

Size XS S M L XL
Wheels 650B 650B 650B 650B 650B
Seat tube 470 490 520 550 580
Horizontal top tube 509 526 547 565 588
Seat angle 74.5° 74.5° 74.0° 74.0° 73.5°
Head angle 71.5° 71.5° 72.0° 72.0° 72.0°
Head tube 110 130 150 170 190
BB drop 68 68 68 65 65
Chainstay length 420 420 420 420 420
Fork offset 51 51 51 51 51
Trail 61 61 58 58 58
Wheelbase 985 1003 1016 1035 1053
Standover 746 765 793 818 841
Reach 361 373 384 396 408
Stack 534 553 574 590 609
Front center 575 593 605 624 641
Axle to crown 385 385 385 385 385
Minimum rider height* 150 cm 160 cm 170 cm 179 cm 188 cm
Maximum rider height* 161 cm 171 cm 181 cm 190 cm 199 cm

*The height guidelines are an indicative reference based on rider height only. We can help you interpret geometry and technical standards, choose compatible components, and define a coherent setup: info@bikejamming.it.

Configuration & support

We can help you choose compatible components and define the most suitable configuration for your project on this Audax Frameset.

Frequently asked questions about the Bombtrack Audax Frameset

Is the Bombtrack Audax Frameset a gravel frame or an all-road platform?

The Bombtrack Audax Frameset makes more sense as a fast all-road and real-world road platform than as a pure gravel frame. It is designed for asphalt, secondary roads, white roads, and light gravel with a lively ride feel suited to long-distance mileage.

What is the difference between the Bombtrack Audax Frameset and the Audax AL Frameset?

The steel Audax Frameset places more emphasis on ride feel, four-season use, and real-world road riding, with a more filtered and progressive response. The Audax AL is more direct, stiffer, and more clearly focused on fast all-road riding in a lightweight direction.

What tires can the Bombtrack Audax Frameset fit?

The fork accepts up to 650B × 50C or 700C × 35C without fenders. The frame goes up to 650B × 47C or 700C × 35C without fenders.

Is the Bombtrack Audax Frameset compatible with 650B and 700C?

Yes. It was designed around a 650B platform, but it remains compatible with 700C within the stated clearances. In practice, 650B is its most natural interpretation, while 700C makes sense for road-focused and faster-rolling setups.

Can you fit fenders, racks, and lights on the Bombtrack Audax Frameset?

Yes. The frame has rack and fender mounts, internal light cable routing, and an integrated rear light mount. The fork adds fender mounts and cage mounts, so the frameset works very well for clean and useful setups.

Is the Bombtrack Audax Frameset compatible with 1x and 2x drivetrains?

Yes. It supports 1x configurations up to 44 teeth with a 45 mm chainline, or 2x setups up to 53 / 39 teeth with a 43.5 mm chainline.

Is the Bombtrack Audax Frameset suitable for long distances and light touring?

Yes. It is one of its most natural use cases: long rides, fast commuting, light touring, and four-season all-road riding all fit perfectly within the frame’s logic.

What technical standards does the Bombtrack Audax Frameset use?

It uses an 86.5 mm T47 bottom bracket, 12 × 100 mm and 12 × 142 mm thru-axles, flat mount brakes, and a 27.2 mm seat post. These are modern and highly relevant standards for building a reliable and up-to-date bike.

  • Brand
  • Reference
    BTAFSMDBS
  • Condition
    New

  • Frame
    Allroad Endurance
  • Wheel Size
    27.5/29''

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