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.
All our bikes are fully built by our Cytech qualified mechanics. To find out more, see the Built, Checked, Tuned and Tested section below to see how we'll deliver your bike.
We offer FREE DELIVERY of your bike to your home or place of work. Once you've placed your order, our Customer Care team will be in contact to offer a convenient delivery date of your choice.
We've partnered with Pedalsure to offer you 30-DAYS FREE bike insurance on new bikes over £400. Visit our Cycle Insurance page to learn more and claim.
BMC 257 Urbanchallenge AL ONE ST Hybrid Bike 2023
The 257 Urbanchallenge AL ONE ST is the ultimate urban bike for your daily rides. Its sleek and clean design, along with its functional integration, make it the perfect partner for your urban adventures. The Premium Aluminium frame is lightweight, versatile and powder-coated for extra durability.
One of the standout features of this bike is the integrated StVZO certified lights, which provide excellent visibility and safety in urban environments. The lights are powered by an internal battery and have StvZo certification.
In addition to its safety features, the 257 Urbanchallenge AL ONE ST also has premium fenders and an integrated rear carrier, which blend style and functionality. The kickstand adds extra convenience for daily use.
The reliable Shimano Alfine 8 groupset with a beltdrive provides a smooth and enjoyable riding experience. The bike's belt drivetrain and integrated gear hub also make it low maintenance and highly durable.
The minimalist Swiss Design of the 257 ONE ST ensures that you'll stand out in style. The bike is also incredibly durable, thanks to its use of Premium Aluminium and Powder Coating materials.
In summary, the 257 ONE ST is the perfect urban bike for your daily rides. It has a sleek design, functional features, and reliable performance. The built-in lights, premium fenders, and integrated rear carrier make it a great choice for those who value both style and functionality.
Technical Specification
| Frame | 257 Premium Aluminium Smoothwelded, Staggered Top Tube, Powder Coat Finish, Internal Cable Routing |
| Fork | 257 Premium Aluminium, Fender Mounts, Flat Mount Disc, 12x100mm Thru-Axle |
| Wheels | Aluminum SR500 rims and Shimano Alfine 8 rear hub |
| Tyres | Pirelli Angel GT - 37mm, Clearance for 42mm (Measured Width) |
| Rear Derailleur | Shimano Alfine 8-speed internal hub |
| Shift Levers | Shimano Alfine 8 Rapidfire Plus |
| Brake Levers | Shimano MT200 levers |
| Brakes | Shimano BR-U300/ MT200/ RT10 Rotors (160/160) |
| Chain | Belt Gates 120 CDX |
| Cassette | Gates SUREFIT 3-LOBE UNIFIED CDX2 4T |
| Crankset | Gates S550 CDX 55T |
| Saddle | Selle Royal Vivo Women's |
| Seatpost | Lightskin with Integrated Lights |
| Stem | MSM01 Stem |
| Handlebar | Lightskin with Integrated Lights |
| Bottom Bracket | BSA Threaded Bottom Bracket |
| Pedals | Available to be purchased separately |
| Weight Limit | 120 Kg |
| Extras | 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.
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.