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Regular price $1,999.00
Regular price $2,999.00 Sale price $1,999.00
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Tax included. Shipping calculated at checkout.

Size Chart

KOOTU BERSERKER GRX-400 frame geometry

Shipping & Return

Shipping to
Average Delivery Time
Bikes Shipping Cost
United States
6-12 business days
7-15 business days
6-12 business days
Middle East
10-15 business days
10-15 business days
10-15 business days
6-10 business days
6-12 business days
20-35 business days
12-18 business days

Shipping Information

  • Once your order has been placed, we'll send you a confirmation email with your order number. 
  • When your order has been shipped, we'll send you an email with a tracking number and a link that you can track it online. 
  • No Tariff will be required to our customers on the Standard shipping methods.

Processing Time

After we received your order. It usually takes 2-3 business days for production, assembly, debug, packing, and sent out (Some new models may take 10-13 working days). Because we want to make sure the customer gets the bike 90% pre-assembled.

14-days Free replacement: contact customer service for missing and critically-damaged parts or other quality-related issues. Our customer service team will help to arrange the replacement.

Our policy lasts 14 days. If 14 days have gone by since delivery, unfortunately we can’t offer you a refund or exchange.

Contact Us


  • $100 OFF
  • 14 Days Easy Return
  • Free Shipping
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2023 KOOTU BERSERKER GRX-400 Carbon Gravel Bike 20 Spd

Looking for a high-performance carbon gravel bike that can handle any terrain? Look no further than the KOOTU BERSERKER GRX-400. This top-of-the-line bike boasts a lightweight carbon frame, a powerful Shimano GRX-400 drivetrain, and rugged, versatile tires that are perfect for gravel, dirt, and pavement. Whether you're racing, touring, or exploring off-road, the KOOTU BERSERKER is the ultimate choice for serious cyclists.

Collapsible content

Bicycle components:

Frame Size: 47cm/51cm/54cm/56cm
Wheel Size: 700C
Color: Black white/Black gold


Frame Material: T800 carbon fiber
Fork: T800 carbon fiber, fork open 100mm
Handlebar: Aluminum alloy
Stem: Aluminum alloy
Saddle: YBT, PU-leather
Seat Post: T800 carbon fiber, 350mm

Derailleur / Brake System:

Shift lever: SHIMANO ST-RX400
Front Derailleur: SHIMANO FD-RX400
Rear Derailleur: SHIMANO RD-RX400
Flywheel: SHIMANO CS-HG500 (11-13-15-17-19-21-23-26-30-34T)
Crank: SHIMANO FC-RX600, 46-30T(170MM)

The standard brake setting is Left hand control front brake, Right hand control rear brake, if you want to change, please let us know.

Transmission Control System:

Chain: KMC X10R
Pedal: SANYUN LP-658A

Wheelset System:

Wheelset: Aluminum, 700c,30mm depth
Tires: Continental Terra ShieldWall (40-622)

Shimano GRX Shifting

Professional drop handlebar, with special anti-slip paint on the lever, bring you comfortable and smoothy gear shifting experience.

Full Internal Cable Route

Internal cable route design, so that the appearance of the frame more neat, while reducing wind resistance.

Front Derailleur

The FD-RX400 impresses with a natural shifting stoke feeling and its smooth-running functionality which is characterized by a very ergonomic power curve as well as the integration of a cable tension adjustment function.

Rear Derailleur

Characterized by quiet, smooth, precise and reliable shifting even in the most demanding terrain. When activated the rear derailleur pivot takes a firm hold to reduce excessive movement, noise and general "chain chatter".

Shimano RS470 HUB

High performance, seal bearing with good Lubrication.

Shimano HG500 Cassette

Flywheel with chain retention technology for sharp shifting.


Starting from the needs of riders, we are committed to providing riders with "professional carbon bikes with cost performance".

Find Your Bike
  • Brand Story

    From German craftsmanship, 18 years of industrial manufacturing experience...

  • Free Shipping

    Kootu's mission is to make high-end carbon fiber bikes affordable for everyone

  • UCI Approved

    All road wheelsets are UCI Approved

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