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Bombtrack Audax Evo Grx610 vs Bombtrack Hook Grx400

Bombtrack Audax Evo Grx610, side view

Bombtrack

Audax Evo Grx610

Bombtrack Hook Grx400, side view

Bombtrack

Hook Grx400

Mid-rangeSteel650b / 27.5"2025
Entry levelSteel29" front, 27.5" rear2024

Close on the specs and the list price: here are their 19 differences, line by line.

Bombtrack Audax Evo Grx610, side viewBombtrackBombtrack Audax Evo Grx610
Bombtrack Hook Grx400, side viewBombtrackBombtrack Hook Grx400

At a glance

  • Bombtrack Audax Evo Grx610 is 500 g lighter than Bombtrack Hook Grx400 (brand figures).
  • Bombtrack Audax Evo Grx610 is the newer model (2025).
Key specs7 differences
Model year 2025 2024
Weight 10.5 kg Best of the comparison 11 kg +500 g
FrameSame for all Steel
As printed

4130 double-butted chromoly

 Steel
As printed

Frame: Columbus Cromor steel, double-butted

Wheelset 650b / 27.5" · Seido Sinus i25 rims, Seido Tau hubs, 32 spokes
As printed

Seido Sinus i25, tubeless-ready, 32 spokes; Seido Tau sealed hubs

 29" front, 27.5" rear · WTB ST i19 double wall °Value not published by the brand
Drivetrain 2×12 2×10
Groupset Shimano GRX 610 2x12
As printed

Shimano GRX 610, 2x12 speed, hydraulic

 Shimano GRX RX400
As printed

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

Brake model Shimano GRX BR-RX400 hydraulic
As printed

Shimano GRX BR-RX400 hydraulic disc

 Shimano GRX hydraulic disc
As printed

Levers and calipers: Shimano GRX hydraulic disc

Seatpost Rigid · Ritchey Comp aluminium seatpost 27.2 mm x 400 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 Audax Evo Grx610

Bombtrack Audax Evo Grx610

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.

  • Audax Evo Grx610 · Gravel bike all-round, rather nimble, average equipment.
  • Hook Grx400 · Gravel bike rather for smooth ground, neutral handling, entry-level equipment.
Terrain
Bombtrack Audax Evo Grx610 56%Bombtrack Hook Grx400 26%1 bike7 bikes4 bikes · Bombtrack Hook Grx4001 bike3 bikes1 bike2 bikes4 bikes · Bombtrack Audax Evo Grx6104 bikes1 bike2 bikes3 bikes4 bikes
EasyDemanding
Handling
Bombtrack Audax Evo Grx610 33%Bombtrack Hook Grx400 43%5 bikes1 bike1 bike2 bikes1 bike1 bike · Bombtrack Audax Evo Grx6102 bikes1 bike1 bike · Bombtrack Hook Grx4002 bikes1 bike2 bikes4 bikes1 bike3 bikes3 bikes1 bike
NimbleStable
Bombtrack Audax Evo Grx610Bombtrack 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 fork3 differences
ForkSame for all Carbon
As printed

Seido Banjo full carbon

 Carbon
As printed

Fork: Full carbon

Frame weight 2,410 g Best of the comparison 2,420 g +10 g
Max tyre clearance 47 mm Best of the comparison 45 mm °Value not published by the brand−2 mm
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 T47, 86.5 mm shell
As printed

86.5 mm T47 bottom bracket shell

 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 °Value not published by the brand 27.2 mm
Drivetrain5 differences
Groupset brandSame for all Shimano
As printed

Shimano GRX 610

 Shimano
As printed

Shimano GRX ST-RX400

ShiftingSame for all Mechanical °Value not published by the brand
As printed

Shimano GRX RD-RX820 Shimano GRX ST-RX610 STI 2 x 12

 Mechanical °Value not published by the brand
As printed

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

ChainringsSame for all 2 2
Gears at the back 12 Best of the comparison 10 −2
Chainring teeth Shimano GRX FC-RX810-2, 24 mm spindle Shimano GRX FC-RX600-10
As printed

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

Cassette Shimano 105 CS-HG710-12, 11-36T
As printed

Cassette: Shimano 105 CS-HG710-12, 11–36 T

 Shimano CS-HG50 11-36T
As printed

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

Rear derailleur Shimano GRX RD-RX820 °Value not published by the brand SHIMANO GRX RD-RX400, clutch °Value not published by the brand
Shifters Shimano GRX ST-RX610 STI 2 x 12 °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

Shimano GRX BR-RX400 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

WTB Byway TCS 47-584

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

Tyres: WTB Byway TCS 47-584 (front), WTB Horizon TCS 47-584 (rear)

 XS - S WTB RESOLUTE 42-584 /, M - XL WTB VENTURE 40-622, tubeless ready °Value not published by the brand
Tyre width fitted 47 mm –Not given
Cockpit and seatpost3 differences
Handlebar Ritchey Road Comp Streem III drop bar, 31.8 mm, 5° backsweep °Value not published by the brand BOMBTRACK CX-10 drop bar, 31.8 mm, 10° flare °Value not published by the brand
Stem Ritchey Comp 4-Axis 44 forged aluminium stem, -6° °Value not published by the brand BOMBTRACK ROAM forged aluminium stem, -7° °Value not published by the brand
Seatpost model Ritchey Comp aluminium seatpost 27.2 mm x 400 mm °Value not published by the brand BOMBTRACK BEECH 27.2 mm x 300 mm °Value not published by the brand
Weight
Weighed in sizeSame for all M
As printed

size M

 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.

Audax Evo Grx610 · MHook Grx400 · M
  • Audax Evo Grx610 · M
  • Hook Grx400 · M

Stack and reach

530540550560570580590600350360370380390400410420↖ UprightAggressive ↘Reach (mm)Stack (mm)Audax Evo Grx610 · M — Reach (mm) 383 · Stack (mm) 571Hook Grx400 · M — Reach (mm) 378 · Stack (mm) 565
  • Audax Evo Grx610 · M Audax Evo Grx610 · M — Reach (mm) 383 · Stack (mm) 571
  • Hook Grx400 · M Hook Grx400 · M — Reach (mm) 378 · Stack (mm) 565
Geometry12 differences
SizeSame for all M M
Reach 383 mm 378 mm −5 mm
Stack 571 mm 565 mm −6 mm
Top tube (effective) 547 mm 540 mm −7 mm
Seat tube 520 mm 525 mm +5 mm
Head tube 150 mm 130 mm −20 mm
Head angleSame for all 72° 72°
Seat angleSame for all 74° 74°
Chainstays 420 mm 425 mm +5 mm
Wheelbase 1,018 mm 1,010 mm −8 mm
Front centre 607 mm 594 mm −13 mm
Standover 794 mm 802 mm +8 mm
BB drop 68 mm 67 mm −1 mm
Fork offset 53 mm 48 mm −5 mm
Trail 56 mm 64 mm +8 mm
BB height–Not given 282 mm

Where to buy them

Compare the whole Bombtrack Audax rangeCompare the whole Bombtrack Hook range

Frequently asked questions

Which is lighter, Bombtrack Audax Evo Grx610 or Bombtrack Hook Grx400?

Bombtrack Audax Evo Grx610 weighs 10.5 kg, Bombtrack Hook Grx400 11 kg, as their brands give them.

What groupset do Bombtrack Audax Evo Grx610 and Bombtrack Hook Grx400 come with?

Bombtrack Audax Evo Grx610: Shimano GRX 610 2x12. Bombtrack Hook Grx400: Shimano GRX RX400.

How do Bombtrack Audax Evo Grx610 and Bombtrack Hook Grx400 compare on geometry?

In size M, Bombtrack Audax Evo Grx610 has a stack of 571 mm for a reach of 383 mm; in size M, Bombtrack Hook Grx400 has 565 mm for 378 mm. More stack for the reach means a more upright position.

Other comparisons

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