Bombtrack Hook Ext vs Bombtrack Audax Grx810

Bombtrack

Hook Ext

Bombtrack

Audax Grx810

Entry levelSteel650b / 27.5"2025

Entry levelSteel650b / 27.5"2024

Close on the specs and the list price: here are their 21 differences, line by line.

BombtrackBombtrack Hook Ext

BombtrackBombtrack Audax Grx810

At a glance

Differences only

Bombtrack Audax Grx810 is 800 g lighter than Bombtrack Hook Ext (brand figures).
Bombtrack Audax Grx810 has the higher-range groupset: Shimano GRX 600 2x11, against SRAM SX Eagle.
Bombtrack Hook Ext is the newer model (2025).

Key specs7 differences

Model year 2025 2024

Weight 11.6 kg 10.8 kg −800 g

Frame Steel

As printed

Frame: Columbus Cromor double-butted

Steel

As printed

Columbus Cromor double-butted steel

Wheelset 650b / 27.5" · WTB ST Light i25 double wall ^{°Value not published by the brand} 650b / 27.5" · WTB ST i25 rims, Bombtrack Tau hubs, 32 spokes

As printed

WTB ST i25 double-wall rims, 32 spokes, TCS 2.0; Bombtrack Tau sealed hubs

Drivetrain 1×12 2×11

Groupset SRAM SX Eagle

As printed

Rear derailleur: SRAM SX Eagle, clutch, long cage

Shimano GRX 600 2x11 Higher range

As printed

Shimano GRX 600 (2x11); RD GRX RD-RX810, FD GRX FD-RX810, shifters GRX ST-RX600

Brake model SRAM Level hydraulic disc

As printed

Levers and calipers: SRAM Level hydraulic disc

Shimano GRX BR-RX400 hydraulic, GRX ST-RX600 levers

As printed

Shimano GRX BR-RX400 hydraulic disc brakes with GRX ST-RX600 hydraulic levers

Seatpost Rigid · Bombtrack Yew aluminium seatpost, 27.2 mm x 300 mm ^{°Value not published by the brand} Rigid · RITCHEY COMP 2-BOLT aluminium seatpost 27.2 mm x 400 mm ^{°Value not published by the brand}

Prices

Each model's retailers, delivered to your country, and their prices over time.

Bombtrack Hook Ext

Bombtrack Audax Grx810

Affiliate links: no extra cost for you ♥

Character

The bike at a glance: the ground it is made for, how it handles, its gears and its equipment, beside the other bikes of its kind.

Hook Ext · Gravel bike made for very smooth ground, very nimble, entry-level equipment.
Audax Grx810 · Gravel bike all-round, very nimble, entry-level equipment.

Terrain

EasyDemanding

Handling

NimbleStable

Bombtrack Hook ExtBombtrack Audax Grx810other gravel bikes

Components and specs

Every spec line by line; the higher range of a component is marked. The technical groups are folded.

Ride type

Suspension Rigid ^{°Value not published by the brand} Rigid ^{°Value not published by the brand}

Frame and fork3 differences

Fork Carbon

As printed

Fork: Bombtrack EXT full carbon

Carbon

As printed

Fork: Full carbon

Frame weight 2,710 g 2,410 g −300 g

Max tyre clearance 45 mm ^{°Value not published by the brand} 47 mm +2 mm

Axles Thru-axles

As printed

Thru-axles: 12 x 100 mm front, 12 x 142 mm rear

Thru-axles

As printed

Thru-axles are 12x100 mm front and 12x142 mm rear

Bottom bracket SRAM DUB T47, 85.5 mm

As printed

Bottom bracket: SRAM DUB T47, 85.5 mm

BOMBTRACK T47 internal sealed BB for 30 mm spindle ^{°Value not published by the brand}

Cable routing Internal ^{°Value not published by the brand}

As printed

internal light cable routing

Internal ^{°Value not published by the brand}

As printed

internal light cable routing

Seatpost diameter 27.2 mm 27.2 mm

Drivetrain7 differences

Groupset brand SRAM

As printed

SRAM SX Eagle

Shimano

As printed

Shimano GRX 600

Shifting Mechanical ^{°Value not published by the brand}

As printed

SRAM SX Eagle, clutch, long cage SRAM SX-Eagle 12-speed shifter

Mechanical ^{°Value not published by the brand}

As printed

SHIMANO ULTEGRA RD-RX800-GS, clutch, medium cage SHIMANO 105 ST-R7020 STI 2 x 11

Chainrings 1 2 +1

Gears at the back 12 11 −1

Chainring teeth SRAM Rival Wide, DUB

As printed

Crankset: SRAM Rival Wide, DUB spindle, 8-bolt direct mount

BOMBTRACK LYER forged aluminium crank, direct mount interface, (SRAM compatible),30 mm spindle ^{°Value not published by the brand}

Cassette SRAM PG-1210 Eagle 11-50T

As printed

Cassette: SRAM PG-1210 Eagle, 12-speed, 11-50T

Shimano 105, 11-34T

As printed

11-speed cassette, 11–34T (Shimano 105)

Rear derailleur SRAM SX Eagle, clutch, long cage ^{°Value not published by the brand} SHIMANO ULTEGRA RD-RX800-GS, clutch, medium cage ^{°Value not published by the brand}Higher range

Shifters SRAM SX-Eagle 12-speed shifter ^{°Value not published by the brand} SHIMANO 105 ST-R7020 STI 2 x 11 ^{°Value not published by the brand}Higher range

Brakes

Brakes Hydraulic disc

As printed

SRAM Level hydraulic disc

Hydraulic disc

As printed

Shimano GRX BR-RX400 hydraulic disc brakes

Front rotor 160 mm 160 mm

Rear rotor 160 mm 160 mm

Wheels and tyres1 difference

Wheel size 650b / 27.5"

As printed

Tires: WTB Ranger TCS Light, 27.5" x 2.0"

650b / 27.5"

As printed

WTB Byway TCS 47-584

Rims Aluminium ^{°Value not published by the brand} Aluminium ^{°Value not published by the brand}

Tubeless ready yes yes ^{°Value not published by the brand}

Tyres WTB Ranger TCS Light 27.5" x 2.0"

As printed

Tires: WTB Ranger TCS Light, Fast Rolling, 27.5" × 2.0"

WTB Byway TCS 47-584 front, WTB Horizon TCS 47-584 rear

Tyre width fitted– 47 mm

Cockpit and seatpost3 differences

Handlebar Bombtrack Trail flat bar, 31.8 mm, 9° backsweep, 4° upsweep, 7 mm rise ^{°Value not published by the brand} RITCHEY COMP STREEM III drop bar, 31.8 mm, 5° backsweep ^{°Value not published by the brand}

Stem Bombtrack Roam forged aluminium stem, -7° ^{°Value not published by the brand} RITCHEY COMP 4-AXIS 44 forged aluminium stem, -6° ^{°Value not published by the brand}

Seatpost model Bombtrack Yew aluminium seatpost, 27.2 mm x 300 mm ^{°Value not published by the brand} RITCHEY COMP 2-BOLT aluminium seatpost 27.2 mm x 400 mm ^{°Value not published by the brand}

Weight1 difference

Weighed in size L

As printed

11.6 kg (size L)

As printed

size M

Max total weight– 120 kg

Mounts and storage

Rack mounts yes yes

Mudguard mounts yes yes

° Value not published by the brand

Geometry

A size per bike (the nearest to the first one's at first), the differences measured from the reference bike.

Size of Hook Ext

Size of Audax Grx810

Differences measured from

Hook Ext · M
Audax Grx810 · L

Stack and reach

Hook Ext · M Hook Ext · M — Reach (mm) 387 · Stack (mm) 589
Audax Grx810 · L Audax Grx810 · L — Reach (mm) 396 · Stack (mm) 590

Geometry13 differences

Size M L

Reach 387 mm 396 mm +9 mm

Stack 589 mm 590 mm +1 mm

Top tube (effective) 556 mm 566 mm +10 mm

Seat tube 530 mm 550 mm +20 mm

Head tube 150 mm 170 mm +20 mm

Head angle 72° 72°

Seat angle 74° 74°

Chainstays 425 mm 420 mm −5 mm

Wheelbase 1,025 mm 1,037 mm +12 mm

Front centre 610 mm 626 mm +16 mm

Standover 803 mm 818 mm +15 mm

BB drop 70 mm 65 mm −5 mm

Fork offset 48 mm 53 mm +5 mm

Trail 62 mm 56 mm −6 mm

Where to buy them

Bombtrack Hook Ext
Its full spec sheet Compare the whole Bombtrack Hook range
Bombtrack Audax Grx810
Its full spec sheet Compare the whole Bombtrack Audax range

Compare the whole Bombtrack Hook range Compare the whole Bombtrack Audax range

Frequently asked questions

Which is lighter, Bombtrack Hook Ext or Bombtrack Audax Grx810?

Bombtrack Audax Grx810 weighs 10.8 kg, Bombtrack Hook Ext 11.6 kg, as their brands give them.

What groupset do Bombtrack Hook Ext and Bombtrack Audax Grx810 come with?

Bombtrack Hook Ext: SRAM SX Eagle. Bombtrack Audax Grx810: Shimano GRX 600 2x11.

How do Bombtrack Hook Ext and Bombtrack Audax Grx810 compare on geometry?

In size M, Bombtrack Hook Ext has a stack of 589 mm for a reach of 387 mm; in size L, Bombtrack Audax Grx810 has 590 mm for 396 mm. More stack for the reach means a more upright position.

Compare other models

Bombtrack Hook Ext vs Bombtrack Audax Grx810

At a glance

Prices

Character

Components and specs

Geometry

Stack and reach

Where to buy them

Frequently asked questions

Other comparisons