• Bombtrack Audax – Endurance Road Bike in Steel
  • Bombtrack Audax – Endurance Road Bike in Steel
  • Bombtrack Audax – Endurance Road Bike in Steel
  • Bombtrack Audax – Endurance Road Bike in Steel
  • Bombtrack Audax – Endurance Road Bike in Steel
  • Bombtrack Audax – Endurance Road Bike in Steel
  • Bombtrack Audax – Endurance Road Bike in Steel
  • Bombtrack Audax – Endurance Road Bike in Steel
  • Bombtrack Audax – Endurance Road Bike in Steel

BOMBTRACK Audax - Metallic Dark Brown

€3,000.00 (Save €502.00)
€2,498.00
Tax included

A steel endurance/allroad bike built for long distances, mixed surfaces and real long-ride comfort.

 

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The Bombtrack Audax Metallic Dark Brown is a steel allroad/endurance bike built for riders who put real long-distance comfort first, want the ability to adapt to different surfaces and appreciate a ride feel that is more filtered and progressive than the aluminium versions.

The Columbus Cromor double-butted frame delivers the classic feel of steel: vibration absorption, stability and long-term durability. The full carbon fork keeps the front end lighter and expands versatility thanks to its accessory mounts, while the Shimano GRX 2×11 groupset and hydraulic brakes complete a setup designed for real-world, continuous, long-range use.

Why it’s an Audax

  • Columbus Cromor double-butted frame: natural comfort, durability and predictable long-distance handling.
  • Full carbon fork with multiple mounts for fenders and bags.
  • Shimano GRX 2×11 drivetrain: gravel-specific ergonomics and smooth shifting.
  • 48/32T crankset + 11–34T cassette: versatile gearing for climbs, flats and mixed terrain.
  • 650B wheels with 47C tyres: high comfort and strong grip.
  • T47 standard: robust and easy to service.

Technical strengths

  • More comfort than aluminium over long distances.
  • GRX hydraulic brakes: power and modulation in all conditions.
  • High carrying capacity: ideal for travel and bikepacking.
  • Stable, predictable geometry even when loaded.
  • Cable routing designed for everyday use and lighting setups.

Short description

A steel endurance/allroad bike built for long distances, imperfect tarmac and mixed surfaces, with a strong comfort-oriented character.

Ideal for

  • White roads, rough tarmac and light gravel.
  • Randonnée riding.
  • Minimal touring or light-load travel.
  • Robust year-round commuting.
  • Riders looking for comfort and long-term durability.

Technical specifications (summary)

  • Frame: Columbus Cromor double-butted, TA, rack / fender mounts, internal light cable routing, rear light mount, T47 86.5 mm.
  • Fork: full carbon, TA, 1.1/2'' - 1.1/8'', with fender / cage mounts.
  • Groupset: Shimano GRX 2×11.
  • Crankset: Bombtrack Lyer, direct mount interface, 30 mm spindle, 48 / 32T chainrings.
  • Cassette: Shimano 105 11-speed, 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 format.
  • Tyres: WTB Byway TCS 650B × 47C front / WTB Horizon TCS 650B × 47C rear, tubeless ready.
  • Seatpost: Ritchey Comp 27.2 × 400 mm.
  • Weight: 10.8 kg (size M).

Tyre clearance

  • Frame: 650B × 47C / 700C × 35C.
  • Fork: 650B × 50C / 700C × 35C.

Technical interpretation

The bike comes stock with 650B wheels and 47 mm tyres: this is the standard build, designed to prioritise comfort, stability and control on rough tarmac, white roads and mixed routes.

Compatibility with 700C wheels up to 35 mm does not mean the bike comes in a dual wheel format from the factory. It means that the frame and fork can accept a second complete wheelset, different from the one fitted as standard.

This point matters: 650B and 700C are two different wheel diameters, so this is not only about changing tyre width, but about changing the entire wheel/rim format.

In practice, with two wheelsets you can get two distinct ride characteristics:

  • 650B: maximum comfort, grip and vibration damping.
  • 700C: more speed and smoother rolling on tarmac, with a ride feel closer to a long-distance endurance road bike.

This flexibility makes the Audax a very smart platform: as standard it remains a steel allroad/endurance bike with a comfort-first character, but with an additional 700C wheelset it can also become a highly effective bike in more road-focused contexts.

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 an accurate size assessment, you can write to us with your height and inseam measurement: we reply within 24 hours with realistic, personalised advice.

  • Allroad comfort: stock 650B × 47C setup, to make the most of comfort and grip.
  • Endurance road: second 700C × 32–35 mm wheelset to make the bike faster and smoother on tarmac.
  • Light touring / bikepacking: frame bag + handlebar bag + saddle bag, with an optional light rack.
  • Four-season commuting: fenders, lights and a practical everyday setup.

Metallic dark brown colour

A deep, sophisticated finish that highlights the lines of the steel frame, with tones that shift in the light and a warm, timeless aesthetic.

Why buy from us

  • Tracked express shipping.
  • IT/EN support.
  • Real advice on use and sizing.
  • Replies within 24 hours.

Cta

Add the Bombtrack Audax – Metallic Dark Brown to your cart.
For advice: info@bikejamming.it

Specifications

Color 1 Metallic dark brown
Color 2 -
Color 3 -
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 Road Comp Streem III drop bar, 31.8 mm, 5° backsweep
Bar tape Bombtrack Command bar tape
Stem Ritchey Comp 4-Axis 44 forged aluminium stem, -6°
Headset Sealed external aheadset, 1.1/2'' - 1.1/8''
Levers Shimano GRX ST-RX600 STI hydraulic
Shifter Shimano GRX ST-RX600 STI 2 x 11
Brakes Shimano GRX BR-RX400 hydraulic disc brakes
Rotor Shimano SM-RT66 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 -
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-HG70011 11-speed, 11 - 34 T
Front derailleur Shimano GRX FD-RX810-F
Rear derailleur Shimano GRX RD-RX810, clutch
Front hub Bombtrack Tau sealed hub, 6-bolt disc
Rear hub Bombtrack Tau sealed hub, 11-speed, 6-bolt disc
Through axle 12 x 100 mm / 12 x 142 mm
Front rim WTB ST i25 double wall, TCS 2.0, 32h
Rear rim WTB ST i25 double wall, TCS 2.0, 32h
Saddle Bombtrack Dart saddle
Seat post Ritchey Comp aluminium seatpost 27.2 mm x 400 mm
Seat clamp Bombtrack Origin 29.8 mm
Front tire WTB BYWAY TCS 650B x 47C, tubeless ready
Rear tire WTB Horizon TCS 650B x 47C, tubeless ready
Fender -
Rack -
Kickstand -
Light -
Weight 10.8 kg (size M)
Weight frameset 2410 g frame (size M, incl. TA, hanger) / 530 g fork (300 mm steerer, incl. TA)
Maximum rider weight 120 kg incl. luggage
ASTM riding condition 2
Note Final product may vary in appearance, finish and minor details.

Build infos

BB standard T47 - 86.5 mm shell width
Headset standard (S.H.I.S.) EC34 / 28.6 | EC44 / 40
Headset crown race angle 36°
Fork steerer inner diameter 23.6 mm
Fork max tire clearance w/o fender 650B x 50C / 700C x 35C
Frame max tire clearance w/o fender 650B x 47C / 700C x 35C
Maximum chainring clearance 1x 44 T with 45 mm chainline
Maximum chainring clearance 2x 53 / 39 T 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 FM 140 / 160
Brake mount rear FM 140 / 160
Frame thickness rear brake mount 10 mm
Maximum rotor clearance front 160 mm
Maximum rotor clearance rear 160 mm
Front through axle 12 mm x 100 mm, 1.5 thread pitch
Rear through axle 12 mm x 142 mm, 1.5 thread pitch
ISO testing standard Road
Crankarm XS 165 mm / S - M 170 mm / L - XL 175 mm
Q Factor 152 mm
BCD crank 104 mm (Sram direct mount compatible spider), 4 bolts
Chainring offset small ring 0 mm / big ring -2 mm
Chainline 45 mm
Spoke length front wheel 272 mm, 274 mm
Spoke length rear wheel 274 mm, 272 mm
Spoke count (front / rear) 32 / 32
ERD 570 mm
Front hub PCD 58 mm
Rear hub PCD 58 mm
Front hub flange distance / offset 56.5 mm center to center / 6.6 mm
Rear hub flange distance / offset 51 mm center to center / 8.8 mm
Stem length XS - S 80 mm / M 90 mm / L - XL 100 mm
Stem angle -7°
Headset spacers 1 x 10 mm, 2 x 5 mm
Seat post offset 0 mm
Seat post length 350 mm
Bike trailer approved
Seat tube mounted child seat approved
Derailleur hanger BT-DH-008
Frame small parts BT-CR-007
Hub end caps front BT-HC-014
Hub end caps rear BT-HC-017
Cassette body BT-CB-006
Crankarm bolt BT-CRP-002
Through axle front BT-TA-F-601
Through axle rear BT-TA-R-602

Geometry

Bike Size XS S M L XL
Wheel size 650B 650B 650B 650B 650B
Seat Tube Length 470 490 520 550 580
Horizontal TT length 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°
Headtube Length 110 130 150 170 190
BB Drop 68 68 68 65 65
Chainstay Length 420 420 420 420 420
Fork Offset 53 53 53 53 53
Trail 59 59 56 56 56
Wheelbase Length 987 1005 1018 1037 1055
Standover 746 765 794 818 841
Reach 361 373 383 396 408
Stack 534 553 571 590 609
Front Center 577 595 607 626 643
Axle to Crown 385 385 385 385 385
Minimum rider height ¹ 1500 1600 1700 1790 1880
Maximum rider height ¹ 1610 1710 1810 1900 1990

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.

Frequently asked questions about the Bombtrack Audax in steel

Why choose a steel bike like the Bombtrack Audax?

Steel offers more long-distance comfort, better vibration damping and excellent long-term durability.

Is the steel Bombtrack Audax suitable for bikepacking?

Yes. Thanks to its multiple mounts and stable frame, it works very well for bikepacking and light touring.

What is the difference between the steel Audax and the Audax AL?

The steel version prioritises comfort and durability, while the aluminium version is more reactive and performance-oriented.

Is the Bombtrack Audax good for long-distance riding?

Yes. It is designed for randonnée and long hours in the saddle thanks to its endurance geometry and the comfort of the steel frame.

What terrain is this bike best suited for?

Tarmac, white roads and light gravel: it is a true comfort-oriented allroad bike.

Can the Bombtrack Audax run 700C wheels as well as 650B?

Yes. The frame is also compatible with 700C wheels up to 35 mm, but this is not the stock configuration: it requires a second complete wheelset.

What is the difference between 650B and 700C on the Bombtrack Audax?

650B prioritises comfort, grip and vibration damping, while 700C makes the bike faster and smoother on tarmac. They are two different wheel diameters, not just two tyre widths.

  • Brand
  • Reference
    BTMDBXS
  • Condition
    New

  • Frame
    Allroad Endurance
  • Wheel Size
    27.5''

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