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Bombtrack Hook Ext SX Eagle vs Bombtrack Hook Grx400

Bombtrack Hook Ext SX Eagle, side view

Bombtrack

Hook Ext SX Eagle

Bombtrack Hook Grx400, side view

Bombtrack

Hook Grx400

Entry levelSteel650b / 27.5"2025
Entry levelSteel29" front, 27.5" rear2024

Two builds of the Bombtrack Hook line: 21 differences, mostly in the components.

Bombtrack Hook Ext SX Eagle, side viewBombtrackBombtrack Hook Ext SX Eagle
Bombtrack Hook Grx400, side viewBombtrackBombtrack Hook Grx400

At a glance

  • Bombtrack Hook Grx400 is 600 g lighter than Bombtrack Hook Ext SX Eagle (brand figures).
  • Bombtrack Hook Ext SX Eagle is the newer model (2025).
Key specs7 differences
Model year 2025 2024
Weight 11.6 kg 11 kg Best of the comparison−600 g
FrameSame for all Steel
As printed

Frame: Columbus Cromor double-butted

 Steel
As printed

Frame: Columbus Cromor steel, double-butted

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
Drivetrain 1×12 2×10
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

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

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

Prices

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

Bombtrack Hook Ext SX Eagle

Bombtrack Hook Ext SX Eagle

Bombtrack Hook Grx400

Bombtrack Hook Grx400

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.
Terrain
Bombtrack Hook Ext SX Eagle 26%Bombtrack Hook Grx400 26%1 bike7 bikes4 bikes · Bombtrack Hook Ext SX Eagle · Bombtrack Hook Grx4001 bike3 bikes1 bike2 bikes4 bikes1 bike4 bikes2 bikes3 bikes4 bikes
EasyDemanding
Handling
Bombtrack Hook Ext SX Eagle 38%Bombtrack Hook Grx400 43%5 bikes1 bike1 bike2 bikes1 bike1 bike2 bikes · Bombtrack Hook Ext SX Eagle1 bike1 bike · Bombtrack Hook Grx4002 bikes1 bike2 bikes4 bikes1 bike3 bikes3 bikes1 bike
NimbleStable
Bombtrack Hook Ext SX EagleBombtrack Hook Grx400other 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
SuspensionSame for all Rigid °Value not published by the brand Rigid °Value not published by the brand
Frame and fork2 differences
ForkSame for all Carbon
As printed

Fork: Bombtrack EXT full carbon

 Carbon
As printed

Fork: Full carbon

Frame weight 2,710 g 2,420 g Best of the comparison−290 g
Max tyre clearanceSame for all 45 mm °Value not published by the brand 45 mm °Value not published by the brand
AxlesSame for all 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

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

Cable routing Internal °Value not published by the brand
As printed

internal light cable routing

–Not given
Seatpost diameterSame for all 27.2 mm 27.2 mm
Drivetrain7 differences
Groupset brand SRAM
As printed

SRAM SX Eagle

 Shimano
As printed

Shimano GRX ST-RX400

ShiftingSame for all 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

Chainrings 1 2 +1
Gears at the back 12 Best of the comparison 10 −2
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

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

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
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
Brakes
BrakesSame for all Hydraulic disc
As printed

SRAM Level hydraulic disc

 Hydraulic disc
As printed

Levers and calipers: Shimano GRX hydraulic disc

Front rotorSame for all 160 mm 160 mm
Rear rotorSame for all 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
RimsSame for all Aluminium °Value not published by the brand Aluminium °Value not published by the brand
Tubeless readySame for all 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
Cockpit and seatpost2 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
StemSame for all Bombtrack Roam forged aluminium stem, -7° °Value not published by the brand BOMBTRACK ROAM forged aluminium stem, -7° °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
Weight1 difference
Weighed in size L
As printed

11.6 kg (size L)

 M
As printed

Complete bike: 11.0 kg (size M)

Mounts and storage
Rack mountsSame for all yes yes
Mudguard mountsSame for all yes yes
Top tube mounts–Not given 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.

Hook Ext SX Eagle · MHook Grx400 · L
  • Hook Ext SX Eagle · M
  • Hook Grx400 · L

Stack and reach

550560570580590600610620350360370380390400410420↖ UprightAggressive ↘Reach (mm)Stack (mm)Hook Ext SX Eagle · M — Reach (mm) 387 · Stack (mm) 589Hook Grx400 · L — Reach (mm) 389 · Stack (mm) 584
  • 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
Geometry11 differences
Size M L
Reach 387 mm 389 mm +2 mm
Stack 589 mm 584 mm −5 mm
Top tube (effective) 556 mm 562 mm +6 mm
Seat tube 530 mm 545 mm +15 mm
Head tubeSame for all 150 mm 150 mm
Head angleSame for all 72° 72°
Seat angle 74° 73.5° −0.5°
ChainstaysSame for all 425 mm 425 mm
Wheelbase 1,025 mm 1,027 mm +2 mm
Front centre 610 mm 611 mm +1 mm
Standover 803 mm 820 mm +17 mm
BB drop 70 mm 67 mm −3 mm
Fork offsetSame for all 48 mm 48 mm
Trail 62 mm 64 mm +2 mm
BB height–Not given 282 mm

Where to buy them

Compare the whole Bombtrack Hook range

Frequently asked questions

Which is lighter, Bombtrack Hook Ext SX Eagle or Bombtrack Hook Grx400?

Bombtrack Hook Grx400 weighs 11 kg, Bombtrack Hook Ext SX Eagle 11.6 kg, as their brands give them.

What groupset do Bombtrack Hook Ext SX Eagle and Bombtrack Hook Grx400 come with?

Bombtrack Hook Ext SX Eagle: SRAM SX Eagle. Bombtrack Hook Grx400: Shimano GRX RX400.

How do Bombtrack Hook Ext SX Eagle and Bombtrack Hook Grx400 compare on geometry?

In size M, Bombtrack Hook Ext SX Eagle has a stack of 589 mm for a reach of 387 mm; in size L, Bombtrack Hook Grx400 has 584 mm for 389 mm. More stack for the reach means a more upright position.

Other comparisons

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