GENESIS Croix de Fer 40 - GRX 1x12 Reynolds 725 gravel bike
€2,899.00
Tax included
Reynolds 725 steel gravel bike with Shimano GRX 1x12 and hydraulic disc brakes on a thru-axle platform. Designed for dynamic mixed-surface riding, technical gravel and long-distance versatility with a simple modern setup.
Secure payments and protected data
Secure & tracked delivery
Regulated and transparent withdrawal
Recap
Genesis Croix de Fer 40 is the most dynamic and direct model in the Croix de Fer range: Reynolds 725 steel frame, Shimano GRX 1x12 drivetrain, GRX RX820 hydraulic brakes and Maxxis Rambler 700x45c tubeless ready tyres.
It is designed for riders looking for a steel gravel bike capable of handling everything from advanced commuting to more technical mixed-terrain riding, with a modern and straightforward setup focused on real-world usability.
Positioning and riding philosophy
Within the Croix de Fer lineup, the Croix de Fer 40 has a very specific identity: it is not the most “complete” model in the traditional sense, but the most playful, direct and dynamically focused version.
Compared to the Croix de Fer 30, it introduces a more immediate riding experience thanks to the Shimano GRX 1x12 drivetrain. Compared to the Croix de Fer 50, it gives up the double chainring in favour of simplicity, cleaner aesthetics and easier management on mixed terrain.
It is built for:
dynamic gravel riding and variable off-road terrain
fast rides across mixed surfaces
advanced on-road / off-road commuting
long days in the saddle without unnecessary complexity
Its personality is clear: a more technical, simpler and more trail-ready interpretation of the Croix de Fer platform.
Frame and platform
The Reynolds 725 steel frame preserves the core Croix de Fer character: stable, progressive and comfortable across long mixed-surface rides.
The Genesis CrMo fork with thru axle keeps structural consistency with the steel frame and contributes to a predictable, controlled and stable ride feel.
The 12x100 mm front and 12x142 mm rear thru axle standards improve precision and stiffness compared to entry-level QR configurations.
The platform also retains a strong practical focus:
customisable internal cable routing
dropper post compatibility
mudguard mounts
rack mounts
bottle cage and additional cargo mounts
Groupset and technical choices
The Shimano GRX 1x12 drivetrain is the defining element of the Croix de Fer 40. The 40T chainring combined with the 10-51T cassette delivers a wide gear range while maintaining a simple and intuitive setup.
The 1x configuration makes sense for riders looking for:
reduced mechanical complexity
better mud clearance
improved chain retention
simpler shifting on technical terrain
Shimano GRX BR-RX820 hydraulic brakes with 160 mm rotors provide strong modulation and control on descents, rough terrain and long rides.
The Shimano GRX ST-RX820-LA left lever is dropper-ready, reinforcing the bike’s more technical and adventure-oriented positioning.
Wheels and tyres / compatibility
The Croix de Fer 40 comes equipped with Amplitude G-100 wheels and Maxxis Rambler 700x45c tubeless ready tyres.
The rims are tubeless ready, pre-taped and supplied with tubeless valves.
The frame platform is designed around tyre clearance up to 47 mm, allowing riders to prioritise speed, comfort or extra traction depending on the intended use.
700c wheel format
700x45c stock tyres
maximum tyre clearance: 47 mm
pre-taped tubeless ready rims
tubeless valves included
When it makes sense
For riders looking for a more dynamic and simplified Croix de Fer compared to the 2x models.
For gravel riding across mixed surfaces and more technical off-road terrain.
For riders wanting a Shimano GRX 1x12 drivetrain with a Reynolds 725 steel platform.
For advanced commuting, fast mixed-surface riding and long adventure days.
When it does NOT make sense
It is not the ideal choice for riders who prefer the finer cadence control of a 2x drivetrain.
It is not designed as a pure road or fast all-road endurance bike.
It is not the most touring-oriented setup for heavily loaded travel configurations.
Size guide
XS: 156–164 cm
S: 164–172 cm
M: 172–180 cm
L: 178–186 cm
XL: 186–194 cm
These height recommendations are indicative and based only on rider height. We can help you interpret geometry and riding position according to your riding style and intended use: info@bikejamming.it.
For sizing support, send us your height and inseam measurement: response within 24 hours.
Frequently asked questions about Genesis Croix de Fer 40 GRX
What is the difference between the Croix de Fer 40 and the Croix de Fer 30?
The Croix de Fer 40 uses a Shimano GRX 1x12 drivetrain with a 10-51T cassette, while the Croix de Fer 30 is more oriented towards 2x setups. The 40 is simpler, more direct and better suited to dynamic gravel riding.
Is the 1x12 drivetrain limiting?
No, provided the bike is used within its intended purpose. The 10-51T cassette offers a very wide range and the single chainring setup improves simplicity on gravel, mud and technical terrain.
Is it compatible with a dropper seatpost?
Yes. The frame platform supports dropper seatposts and the Shimano GRX ST-RX820-LA left lever is dropper-ready.
Is it tubeless ready?
Yes. The rims, tyres and tape are tubeless ready and tubeless valves are included.
CTA
The Croix de Fer 40 should be chosen according to your real riding style, preferred gearing and terrain.
We can help you understand whether a 1x12 setup is the right choice for your riding and help you select the correct size.
Comments (0)
Your review appreciation cannot be sent
Report comment
Report sent
Your report cannot be sent