Bombtrack Audax 650b Gravel/All-Road Bike (Glossy Sage Green)

Price: $2,999.99
Discontinued Online
This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.

Mixed terrain, or all-road, rides have become all the rage these days, and as such, bikes are following suit with more tire clearance, relaxed geometry numbers, and a ton of fender and accessory mounts. The Bombtrack Audax is designed with this purpose -to provide a nimble feel on tarmac, while the large volume tires smooth out chunk and broken ground to keeping riders comfortable over a wide range of surfaces. Powerful hydraulic disc brakes and a reliable Shimano drivetrain boost the Audax's performance, and round out a platform that any endurance cyclists would be happy to have among their quiver.


  • Columbus Cromor double butted frame construction w/ rack & fender mounts integrated rear light mount
  • Full carbon tapered fork with triple cage mounts and fender mounts
  • Shimano 105/Ultegra mixed drivetrain provides precise shifting and powerful braking performance 
  • Bombtrack Lyer alloy forged crankset with direct mount 2x spider & 48/32T chainrings (Sram DM Compatible)
  • Flat mount hydraulic disc brakes provide consistent and powerful braking performance
  • Top tube bag mounts, triple cage mounts on downtube and seat tube, cage mounts under the downtube, and rear rack/fender mounts
  • Tubeless ready WTB tires 

Frame: Columbus Cromor Double Butted Tubing w/ Rack & Fender Mounts
Fork: Full Carbon w/ Fender & Cage Mounts
Handlebar: Ritchey Comp Streem III (31.8mm) (5° Backsweep)
Grips/Tape: Bombtrack Command Tape
Stem: Ritchey Comp 4-Axis 44 (-6°) 
Headset: Sealed External (1-1/2" - 1-1/8")
Levers: Shimano 105 ST-R7020 STI Hydro 
Shifter: Shimano 105 ST-R7020 STI (2 x 11sp)
Brakes: Shimano 105 BR-7070 Flat Mount Hydraulic Disc (160mm)
Crankset: Bombtrack Lyer Forged Aluminum (Sram DM) (30mm Spindle) 
BB: Bombtrack T47 (Internal Sealed) 
Pedals: -
Chain: KMC X11 (114 Links)
Chainring: Aluminum Sub-Compact (48/32T)
Cassette: Shimano 105 R7000 (11sp) (11-34T)
Front Derailleur: Shimano 105 R7000
Rear Derailleur: Shimano Ultegra RX8000-GS (Medium Cage) (11sp)
Front Hub: Bombtrack TAU (6-Bolt) (12 x 100mm)
Rear Hub: Bombtrack TAU (6-Bolt) (12 x 142mm) (11sp)
Rims: WTB ST i25 (Double Wall) (32H)
Saddle: Bombtrack Comp Saddle
Seatpost: Ritchey Comp 2-Bolt (27.2mm) (400mm)
Seat Clamp: Bombtrack Orgin (29.8mm)
Front Tire: WTB Byway TCS (650B x 47mm)
Rear Tire: WTB Horizon TCS (650B x 47mm) 

*Note: These bikes are fully built by our expert bike builders, then partially disassembled as needed for shipping. Bikes will arrive to you with some basic assembly still required. 

This product was added to our catalog on October 18, 2021

Sizing Recommendations for Riders Who Fall Between Sizes:

  • Sizing down will provide a more maneuverable ride while sizing up will provide more stability
Rider Height (Feet)Rider Height (CM)
XS5'1" - 5'4"155 - 162cm
S5'4" - 5'7"162 - 170cm
M5'7" - 5'10"170 - 178cm
L5'10" - 6'1"178 - 185cm
XL6'1" - 6'4"185 - 193cm

Note: All sizing recommendations are provided by the manufacturer and may differ for each rider.



Wheel Size650B650B650B650B650B
Seat Tube Length470.0mm490.0mm520.0mm550.0mm580.0mm
Horizontal TT Length504.0mm519.0mm544.0mm566.0mm593.0mm
Seat Tube Angle74.5°74.5°74.0°74.0°73.5°
Head Tube Angle71.5°71.5°72.0°72.0°72.0°
Head Tube Length105.0mm125.0mm145.0mm170.0mm195.0mm
BB Drop68.0mm68.0mm68.0mm65.0mm65.0mm
Chainstay Length420.0mm420.0mm420.0mm420.0mm420.0mm
Fork Offset53.0mm53.0mm53.0mm53.0mm53.0mm
Wheelbase Length987.0mm1005.0mm1018.0mm1037.0mm1055.0mm
Standover Height746.0mm765.0mm793.0mm818.0mm841.0mm
Front Center577.0mm595.0mm607.0mm626.0mm643.0mm
Axle to Crown385.0mm385.0mm385.0mm385.0mm385.0mm


Handlebar typeDropbarDropbarDropbarDropbarDropbar
Width (drops)400mm420mm420mm440mm440mm
Width (barends)409mm429mm429mm449mm449mm

Note: All measurements are provided by the manufacturer and may vary depending on how measurements are acquired.