Bombtrack Hook Ext C Apex AXS vs Bombtrack Hook Ext Ti Grx815 Di2

Bombtrack

Hook Ext C Apex AXS

Bombtrack

Hook Ext Ti Grx815 Di2

High endCarbon700c2025

High endTitanium650b / 27.5"2024

Two builds of the Bombtrack Hook line: 22 differences, mostly in the components.

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 900 g lighter than Bombtrack Hook Ext Ti Grx815 Di2 (brand figures).
Bombtrack Hook Ext C Apex AXS is the newer model (2025).

Key specs8 differences

Model year 2025 2024

Weight 9.9 kg 10.8 kg +900 g

Frame Carbon

As printed

Toray T800 carbon blend

Titanium

As printed

Frame: Titanium 3Al-2.5V

Fork model Seido MGV full carbon –

Wheelset 700c · Seido Sinus i21, tubeless ready, 32H 650b / 27.5" · WTB EZR i25 ^{°Value not published by the brand}

Drivetrain 1×12 2×11

Groupset SRAM Apex AXS

As printed

SRAM Apex AXS 1x, 12-speed

Shimano GRX Di2 RX815

As printed

Shifters: Shimano GRX Di2 ST-RX815, 2x11

Brake model 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 · 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}

Prices

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

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 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 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}

Frame and fork2 differences

Fork Carbon

As printed

Seido MGV full carbon

Carbon

As printed

Fork: Seido MGV full carbon

Frame weight 1,380 g 2,060 g +680 g

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

Axles 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 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 hub dynamo cable routing

–

Seatpost diameter 27.2 mm 27.2 mm

Drivetrain8 differences

Groupset brand SRAM

As printed

SRAM Apex AXS 1x

Shimano

As printed

Shimano GRX Di2

Shifting 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

Gears at the back 12 11 −1

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

As printed

Crankset: Shimano GRX 810-2, 24 mm spindle

Cassette 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 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 Apex AXS double tap 1 x 12 ^{°Value not published by the brand} SHIMANO GRX DI2 ST-RX815 2 x 11 ^{°Value not published by the brand}

Brakes

Brakes Hydraulic disc

As printed

Sram Apex flat mount hydraulic disc brakes

Hydraulic disc

As printed

Shimano GRX BR-RX810 hydraulic disc

Front rotor 180 mm 180 mm

Rear rotor 160 mm 160 mm

Wheels and tyres2 differences

Wheel size 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}

Tubeless ready yes yes

Tyres 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 seatpost2 differences

Handlebar 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 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 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}

Weight

Weighed in 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

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 C Apex AXS

Size of Hook Ext Ti Grx815 Di2

Differences measured from

Hook Ext C Apex AXS · M
Hook Ext Ti Grx815 Di2 · M

Stack and reach

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

Geometry11 differences

Size M M

Reach 396 mm 387 mm −9 mm

Stack 583 mm 589 mm +6 mm

Top tube (effective) 563 mm 556 mm −7 mm

Seat tube 530 mm 530 mm

Head tube 150 mm 150 mm

Head angle 70.5° 72° +1.5°

Seat angle 74° 74°

Chainstays 429 mm 425 mm −4 mm

Wheelbase 1,056 mm 1,025 mm −31 mm

Front centre 637 mm 610 mm −27 mm

Standover 805 mm 803 mm −2 mm

BB drop 72 mm 70 mm −2 mm

BB height 277 mm –

Fork offset 53 mm 48 mm −5 mm

Trail 69 mm 62 mm −7 mm

Where to buy them

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 the whole Bombtrack Hook range

Frequently asked questions

Which is lighter, Bombtrack Hook Ext C Apex AXS or Bombtrack Hook Ext Ti Grx815 Di2?

Bombtrack Hook Ext C Apex AXS weighs 9.9 kg, Bombtrack Hook Ext Ti Grx815 Di2 10.8 kg, as their brands give them.

What groupset do Bombtrack Hook Ext C Apex AXS and Bombtrack Hook Ext Ti Grx815 Di2 come with?

Bombtrack Hook Ext C Apex AXS: SRAM Apex AXS. Bombtrack Hook Ext Ti Grx815 Di2: Shimano GRX Di2 RX815.

How do Bombtrack Hook Ext C Apex AXS and Bombtrack Hook Ext Ti Grx815 Di2 compare on geometry?

In size M, Bombtrack Hook Ext C Apex AXS has a stack of 583 mm for a reach of 396 mm; in size M, Bombtrack Hook Ext Ti Grx815 Di2 has 589 mm for 387 mm. More stack for the reach means a more upright position.

Compare other models

Bombtrack Hook Ext C Apex AXS vs Bombtrack Hook Ext Ti Grx815 Di2

At a glance

Prices

Character

Components and specs

Geometry

Stack and reach

Where to buy them

Frequently asked questions

Other comparisons