Why buy your bike from Sigma Sports?
Don't hesitate to reach out to us. It's our goal to answer all of your questions and offer the best advice from our experts. We’ll be happy to answer any questions you may have. Contact us now or visit us in-store.
Save up to 47% with any one of our 11 Cycle to Work partners, and get the health benefits of a new bike in exchange for tax free salary sacrifice. To find out more about our various partners and how to apply click here.
Choose between Free Bike Delivery - to your home or place of work - or our new Premier Bike Delivery Service £99.99 and have your bike delivered "ready to ride" and set up to your measurements with seatpost and pedals adjusted on arrival by a qualified bike mechanic. Either way, our Customer Care team will be in touch to arrange a delivery date to suit you.
We've partnered with Laka to offer you 30 days free bike Insurance on your new bike purchase over £400. Click here for more info and find out how to claim.
257 Urbanchallenge AL ONE Disc Hybrid Bike
Introducing the all-new urban bike of your dreams - the 257 ONE. With its sleek design, meticulous attention to detail, and functional features, it's the perfect companion for your daily rides. Crafted from Premium Aluminium, the frame is not only lightweight but also powder-coated for superior durability.
Experience the joy of cycling with integrated StVZO certified lights, premium fenders, and the reliable Shimano Alfine 8 groupset with belt drive. It provides a seamless and elegant feeling of velocity and safety, making it the perfect choice for any urban environment.
This bike boasts a minimalist yet iconic Swiss Design, making it stand out from the crowd. The Premium Aluminium and Powder Coating used in 257 bikes guarantee superior durability, ensuring that your investment lasts for years to come.
Safety is a top priority, and the 257 series is well-equipped to handle any situation. It comes with a powerful front light and high-visibility rear light, ensuring that you are visible to others in the urban environment. The built-in lights are powered by an internal battery and have StvZo Certification.
Functionality is another feature that sets the 257 ONE apart. With premium fenders and an integrated rear carrier, it effortlessly blends style and functionality. Kickstands also provide added convenience during daily use.
Reliability is essential, and the 257 ONE delivers with its belt drivetrain and integrated gear hub. These features require little maintenance and are weather-resistant, providing great reliability all year round.
In summary, the 257 ONE is a remarkable urban bike with an elegant design, superior durability, and unparalleled safety features. So, what are you waiting for? Get on your bike and enjoy the ride with 257.
Technical Specification
| Frame | 257 Premium Aluminium Smoothwelded |
| Fork | 257 Premium Aluminium |
| Wheels | SR500/SHIMANO Alfine 8 hub |
| Tyres | Pirelli Angel GT - 37mm |
| Rear Derailleur | SHIMANO Alfine 8 |
| Shift Levers | SHIMANO Alfine 8 Rapidfire Plus |
| Brake Levers | SHIMANO BR-U300 - MT200 levers Brakes |
| SHIMANO BR-U300 - MT200 levers / RT10 Rotors (180/180) | |
| Chain | Belt GATES S55 |
| Cassette | GATES SUREFIT 3-LOBE UNIFIED CDX2 4T |
| Crankset | GATES S550 CDX 55T |
| Saddle | Selle Royal Vivo |
| Seatpost | Lightskin with Integrated Lights |
| Stem | MSM01 Stem |
| Handlebar | Lightskin with Integrated Lights |
| Pedals | Available to be purchased separately (or pedals if included) |
| Accessories | Fenders with Integrated Rack, Lights and Kickstand |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.
BMC 257 Urbanchallenge AL ONE Disc Hybrid Bike Sizing
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