JUST BIKES JB04 GRAVEL BIKE WITH SHIMANO GRX-RX400 BLACK

Just Bikes JB04 GRAVEL BIKE with Shimano GRX-RX400 steel frame carbon fork

Your gravel bike – a versatile and reliable companion! Ready for the next adventure tour or perfectly equipped for everyday use – the Just Bikes JB04 can handle it all. The perfect all-rounder – it transforms from a sporty racer into a comfortable touring bike or even a daily commuter. Long distances and many hours in the saddle or short trips, it's always ready to go. On-road or off-road – it rolls on any surface. Asphalt, forest and gravel paths, mud and slush – no problem. It's easy to equip for a quick sprint without luggage or with panniers on an adventure trip. There are plenty of practical bolt-on points with which you can customize your bikepacking setup.

Made of steel - strong values ​​in terms of comfort, durability, safety and sustainability

We value and prefer CrMoly steel as a frame material due to its proven properties:

- has a high elasticity, which offers a high driving comfort, even without extra specific suspension elements

- has very good resilience, is very tough and absorbs external influences and forces more flexibly than other materials

- durable, ideal for building timeless frames

- robust and with high stability, quite insensitive to falls

- natural damping properties

- great durability, has high tensile strength and good elongation

- clean lines, slim tubes, unmistakable look with character

- durable, easy to repair and easy to recycle

Just Bikes JB04 frame

- lightweight, double-butted tubes made of chrome-molybdenum steel (25CrMo4)

- Anti-rust ED-Black coating inside and out

- powder-coated

- 1⅕-1⅛ tapered head tube

- Installation dimensions 12x142 mm (including aluminum thru axle)

- Dropouts with replaceable steel derailleur hanger

- Headset: fully integrated with industrial bearing

- Flatmount disc brake mount for 140 mm or 160 mm brake discs

- Crank/chainring compatibility: for single or double chainrings

- equipped with luggage rack and mudguard mounts

- 2 bottle holders

- Tire clearance up to 45 mm

Colors:

- glossy black

- olive green matt

- olive green/ light green matt

Frame sizes: 530 mm, 550 mm, 570 mm

Just Bikes JB04 full carbon fork

- 1⅕-1⅛ tapered carbon steerer

- Eyelets for mudguard mount

- Installation dimensions 12x100 mm (including aluminum thru axle)

or optionally with multi-purpose, luggage rack and mudguard mounts

Just Bikes JB04 Adventure CrMo steel fork

- 1⅕-1⅛ tapered steel steerer

- 3 eyelets per fork side for attaching mudguards, additional cup holders, lowrider or luggage

- Installation dimensions 12x100 mm (including aluminum thru axle)

- Anti-rust ED-Black coating inside and out

Our "Just Bikes" gravel bikes have a simple mission: "just ride and have fun!"

Simple, classically designed, solid and high-quality equipped, focused on the essentials.

Your new gravel bike will be individually assembled and built for you in our shop in Berlin.

Timeless, elegant, handmade with a personal touch.

The base model we recommend: 28" Cross Gravel Bike JB04 CrMo/Carbon 2x10-speed Shimano GRX 600 / GRX 400 hydraulic disc brakes

Shimano GRX-Explore Beyond

Ready to push boundaries?

The first special components that Shimano has developed from the ground up for gravel adventures to meet the demands

to do justice to asphalt and terrain in equal parts.

A newly designed, well-thought-out solution for those who want to discover the world and

don't want to be stopped by the end of the paved path.

Shimano relies on powerful disc brakes for all GRX groups, one for gravel use

coordinated ergonomics of the brake/shift levers, optimized and specially adapted to the requirements of the gravel area

Gear ratios, more tire clearance, rear derailleurs with integrated chain stabilizer for silent and smooth gear changes

as well as safe chain guidance on rough roads.

Safe handling even in rough terrain, where you always have control.

Proven robustness, performance and precision.

Ritchey- Pioneering spirit, inventiveness and 50 years of experience and passion for biking

Actually, Tom Rithcey was graveling and developing products for such adventures long before the term "gravel riding" became so popular.

He continually manages to realize innovative bike ideas and bring stable and high-quality bike components to the market.

Mavic - with over 130 years of history, one of the most traditional manufacturers of wheels

Mavic Allroad Disc - this reliable UST Road Tubeless wheel gives you the confidence and smooth control you need, even when

when you turn onto adventurous routes.

Specially designed for rough roads, gravel tracks and forest paths, with high rolling efficiency and agility.

The bicycles can also be customized according to customer requirements.

All "just bikes" bicycles are individually assembled in our shop in Berlin.

Specifications