Bombtrack Hook: every build compared

Hook Ext SX Eagle

Entry levelSteel650b / 27.5"2025

Hook Grx400

Entry levelSteel29" front, 27.5" rear2024

Hook Ext C Apex AXS

High endCarbon700c2025

Hook Ext Ti Grx815 Di2

High endTitanium650b / 27.5"2024

The 4 builds of the line side by side, from the cheapest list price: what each step up changes.

BombtrackBombtrack Hook Ext SX Eagle

BombtrackBombtrack Hook Grx400

Bombtrack Hook Ext C Apex AXS, side view

BombtrackBombtrack Hook Ext C Apex AXS

Bombtrack Hook Ext Ti Grx815 Di2, side view

BombtrackBombtrack Hook Ext Ti Grx815 Di2

At a glance

Differences only

Bombtrack Hook Ext C Apex AXS is 1.7 kg lighter than Bombtrack Hook Ext SX Eagle (brand figures).
Bombtrack Hook Ext C Apex AXS has the higher-range groupset: SRAM Apex AXS, against SRAM SX Eagle.
Bombtrack Hook Ext C Apex AXS is the newer model (2025).

Key specs8 differences

Model year 2025 2024 2025 2024

Weight 11.6 kg 11 kg −600 g 9.9 kg −1.7 kg 10.8 kg −800 g

Frame Steel

As printed

Frame: Columbus Cromor double-butted

Steel

As printed

Frame: Columbus Cromor steel, double-butted

Carbon

As printed

Toray T800 carbon blend

Titanium

As printed

Frame: Titanium 3Al-2.5V

Wheelset 650b / 27.5" · WTB ST Light i25 double wall ^{°Value not published by the brand} 29" front, 27.5" rear · WTB ST i19 double wall ^{°Value not published by the brand} 700c · Seido Sinus i21, tubeless ready, 32H 650b / 27.5" · WTB EZR i25 ^{°Value not published by the brand}

Drivetrain 1×12 2×10 1×12 2×11

Groupset SRAM SX Eagle

As printed

Rear derailleur: SRAM SX Eagle, clutch, long cage

Shimano GRX RX400

As printed

Shifters: Shimano GRX ST-RX400, 2x10; Rear derailleur: Shimano GRX RD-RX400

SRAM Apex AXS Higher range

As printed

SRAM Apex AXS 1x, 12-speed

Shimano GRX Di2 RX815

As printed

Shifters: Shimano GRX Di2 ST-RX815, 2x11

Brake model SRAM Level hydraulic disc

As printed

Levers and calipers: SRAM Level hydraulic disc

Shimano GRX hydraulic disc

As printed

Levers and calipers: Shimano GRX hydraulic disc

SRAM Apex flat mount hydraulic disc

As printed

Sram Apex flat mount hydraulic disc brakes

Shimano GRX BR-RX810 hydraulic disc

As printed

Calipers: Shimano GRX BR-RX810, flat mount, hydraulic disc

Seatpost Rigid · Bombtrack Yew aluminium seatpost, 27.2 mm x 300 mm ^{°Value not published by the brand} Rigid · BOMBTRACK BEECH 27.2 mm x 300 mm ^{°Value not published by the brand} Rigid · Seido Yew aluminium seatpost, 27.2 mm x 350 mm ^{°Value not published by the brand} Rigid · SEIDO YEW aluminium seatpost, 27.2 mm x 300 mm ^{°Value not published by the brand}

Fork model–– Seido MGV full carbon –

Prices

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

Bombtrack Hook Ext SX Eagle

Bombtrack Hook Grx400

Bombtrack Hook Ext C Apex AXS

Bombtrack Hook Ext Ti Grx815 Di2

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 SX Eagle · Gravel bike rather for smooth ground, rather nimble, entry-level equipment.
Hook Grx400 · Gravel bike rather for smooth ground, neutral handling, entry-level equipment.
Hook Ext C Apex AXS · Gravel bike all-round, neutral handling, rather high equipment.
Hook Ext Ti Grx815 Di2 · Gravel bike rather for smooth ground, rather nimble, rather high equipment.

Terrain

EasyDemanding

Handling

NimbleStable

Bombtrack Hook Ext SX EagleBombtrack Hook Grx400Bombtrack Hook Ext C Apex AXSBombtrack Hook Ext Ti Grx815 Di2other 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} Rigid ^{°Value not published by the brand} Rigid ^{°Value not published by the brand}

Frame and fork2 differences

Fork Carbon

As printed

Fork: Bombtrack EXT full carbon

Carbon

As printed

Fork: Full carbon

Carbon

As printed

Seido MGV full carbon

Carbon

As printed

Fork: Seido MGV full carbon

Frame weight 2,710 g 2,420 g −290 g 1,380 g −1.33 kg 2,060 g −650 g

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

Axles Thru-axles

As printed

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

Thru-axles

As printed

Through axles: 12 x 100 mm front, 12 x 142 mm rear

Thru-axles

As printed

12 x 100 mm front and 12 x 142 mm rear through axles

Thru-axles

As printed

Through axles: front 12 x 100 mm; rear 12 x 142 mm

Bottom bracket SRAM DUB T47, 85.5 mm

As printed

Bottom bracket: SRAM DUB T47, 85.5 mm

Bombtrack T47 internal sealed, 86.5 mm shell

As printed

Bottom bracket: Bombtrack T47 internal sealed, 86.5 mm shell

SRAM DUB T47 85.5 mm Bombtrack T47 internal sealed, 86.5 mm shell

As printed

Bottom bracket: Bombtrack T47 internal sealed, 24 mm spindle, 86.5 mm shell width

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 hub dynamo cable routing

–

Seatpost diameter 27.2 mm 27.2 mm 27.2 mm 27.2 mm

Drivetrain8 differences

Groupset brand SRAM

As printed

SRAM SX Eagle

Shimano

As printed

Shimano GRX ST-RX400

SRAM

As printed

SRAM Apex AXS 1x

Shimano

As printed

Shimano GRX Di2

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 GRX RD-RX400, clutch SHIMANO GRX ST-RX400 STI 2 x 10

Electronic, wireless ^{°Value not published by the brand}

As printed

SRAM X1 Eagle AXS, clutch, long cage SRAM Apex AXS double tap 1 x 12

Electronic, wired

As printed

Shimano GRX Di2 ST-RX815

Chainrings 1 2 +1 1 2 +1

Gears at the back 12 10 −2 12 11 −1

Chainring teeth SRAM Rival Wide, DUB

As printed

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

Shimano GRX FC-RX600-10

As printed

Crankset: Shimano GRX FC-RX600-10, 24 mm spindle

SRAM Apex Wide, DUB spindle Shimano GRX 810-2 Higher range

As printed

Crankset: Shimano GRX 810-2, 24 mm spindle

Cassette SRAM PG-1210 Eagle 11-50T

As printed

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

Shimano CS-HG50 11-36T

As printed

Cassette: Shimano CS-HG50, 10-speed, 11-36T

SRAM NX Eagle PG-1230 12-speed, 11-50 T Shimano Ultegra CS HG 800 11-34T Higher range

As printed

Cassette: Shimano Ultegra CS HG 800, 11-speed, 11-34T

Rear derailleur SRAM SX Eagle, clutch, long cage ^{°Value not published by the brand} SHIMANO GRX RD-RX400, clutch ^{°Value not published by the brand} SRAM X1 Eagle AXS, clutch, long cage ^{°Value not published by the brand} SHIMANO GRX DI2 RD-RX815 ^{°Value not published by the brand}

Shifters SRAM SX-Eagle 12-speed shifter ^{°Value not published by the brand} SHIMANO GRX ST-RX400 STI 2 x 10 ^{°Value not published by the brand} SRAM Apex AXS double tap 1 x 12 ^{°Value not published by the brand}Higher range SHIMANO GRX DI2 ST-RX815 2 x 11 ^{°Value not published by the brand}

Brakes1 difference

Brakes Hydraulic disc

As printed

SRAM Level hydraulic disc

Hydraulic disc

As printed

Levers and calipers: Shimano GRX hydraulic disc

Hydraulic disc

As printed

Sram Apex flat mount hydraulic disc brakes

Hydraulic disc

As printed

Shimano GRX BR-RX810 hydraulic disc

Front rotor 160 mm 160 mm 180 mm +20 mm 180 mm +20 mm

Rear rotor 160 mm 160 mm 160 mm 160 mm

Wheels and tyres2 differences

Wheel size 650b / 27.5"

As printed

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

29" front, 27.5" rear ^{°Value not published by the brand} 700c / 29"

As printed

WTB Venture TCS Light 40-622

650b / 27.5"

As printed

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

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

Tubeless ready yes yes yes yes

Tyres WTB Ranger TCS Light 27.5" x 2.0"

As printed

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

XS - S WTB RESOLUTE 42-584 /, M - XL WTB VENTURE 40-622, tubeless ready ^{°Value not published by the brand} WTB Venture TCS Light 40-622, tubeless ready WTB Ranger TCS Light 27.5" x 2.0"

As printed

Tyres: WTB Ranger TCS Light/Fast Rolling, 27.5" x 2.0", tubeless ready

Tyre width fitted–– 40 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} BOMBTRACK CX-10 drop bar, 31.8 mm, 10° flare ^{°Value not published by the brand} Seido Tackle drop bar, 31.8 mm, 16° flare ^{°Value not published by the brand} SEIDO TACKLE drop bar, 31.8 mm, 16° flare ^{°Value not published by the brand}

Stem Bombtrack Roam forged aluminium stem, -7° ^{°Value not published by the brand} BOMBTRACK ROAM forged aluminium stem, -7° ^{°Value not published by the brand} Seido Scatter forged aluminium stem, -7° ^{°Value not published by the brand} SEIDO DRIFT forged aluminium stem, 0° ^{°Value not published by the brand}

Seatpost model Bombtrack Yew aluminium seatpost, 27.2 mm x 300 mm ^{°Value not published by the brand} BOMBTRACK BEECH 27.2 mm x 300 mm ^{°Value not published by the brand} Seido Yew aluminium seatpost, 27.2 mm x 350 mm ^{°Value not published by the brand} SEIDO YEW aluminium seatpost, 27.2 mm x 300 mm ^{°Value not published by the brand}

Weight1 difference

Weighed in size L

As printed

11.6 kg (size L)

As printed

Complete bike: 11.0 kg (size M)

As printed

9.9 kg (size M)

As printed

Complete bike: 10.8 kg (size M)

Max total weight–– 115 kg –

Mounts and storage

Rack mounts yes yes yes yes

Mudguard mounts yes yes yes yes

Top tube mounts– 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 SX Eagle

Size of Hook Grx400

Size of Hook Ext C Apex AXS

Size of Hook Ext Ti Grx815 Di2

Differences measured from

Hook Ext SX Eagle · M
Hook Grx400 · L
Hook Ext C Apex AXS · M
Hook Ext Ti Grx815 Di2 · M

Stack and reach

Hook Ext SX Eagle · M Hook Ext SX Eagle · M — Reach (mm) 387 · Stack (mm) 589
Hook Grx400 · L Hook Grx400 · L — Reach (mm) 389 · Stack (mm) 584
Hook Ext C Apex AXS · M Hook Ext C Apex AXS · M — Reach (mm) 396 · Stack (mm) 583
Hook Ext Ti Grx815 Di2 · M Hook Ext Ti Grx815 Di2 · M — Reach (mm) 387 · Stack (mm) 589

Geometry15 differences

Size M L M M

Reach 387 mm 389 mm +2 mm 396 mm +9 mm 387 mm

Stack 589 mm 584 mm −5 mm 583 mm −6 mm 589 mm

Top tube (effective) 556 mm 562 mm +6 mm 563 mm +7 mm 556 mm

Seat tube 530 mm 545 mm +15 mm 530 mm 530 mm

Head tube 150 mm 150 mm 150 mm 150 mm

Head angle 72° 72° 70.5° −1.5° 72°

Seat angle 74° 73.5° −0.5° 74° 74°

Chainstays 425 mm 425 mm 429 mm +4 mm 425 mm

Wheelbase 1,025 mm 1,027 mm +2 mm 1,056 mm +31 mm 1,025 mm

Front centre 610 mm 611 mm +1 mm 637 mm +27 mm 610 mm

Standover 803 mm 820 mm +17 mm 805 mm +2 mm 803 mm

BB drop 70 mm 67 mm −3 mm 72 mm +2 mm 70 mm

Fork offset 48 mm 48 mm 53 mm +5 mm 48 mm

Trail 62 mm 64 mm +2 mm 69 mm +7 mm 62 mm

BB height– 282 mm 277 mm –

Where to buy them

Bombtrack Hook Ext SX Eagle
Its full spec sheet Compare the whole Bombtrack Hook range
Bombtrack Hook Grx400
Its full spec sheet Compare the whole Bombtrack Hook range
Bombtrack Hook Ext C Apex AXS
Its full spec sheet Compare the whole Bombtrack Hook range
Bombtrack Hook Ext Ti Grx815 Di2
Its full spec sheet Compare the whole Bombtrack Hook range

Compare other models

Bombtrack Hook: every build compared

At a glance

Prices

Character

Components and specs

Geometry

Stack and reach

Where to buy them

Other comparisons