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 THREE ST Hybrid Bike 2023
The 257 Urbanchallenge THREE Step Through is the perfect bike for your daily urban rides. It has a sleek and clean design with an emphasis on precise details and functional integration. The Premium Aluminium frame is both lightweight and versatile, and it's powder coated for extra durability.
This bike comes equipped with a powerful kickstand, premium fenders, and a reliable Shimano Nexus 8 belt drive groupset. All these features combine to give you an enjoyable and safe riding experience with a feeling of elegance and speed.
In addition to its performance features, the 257 THREE ST has a minimalist Swiss Design that is sure to make you stand out in style. The bike is also incredibly durable thanks to the use of Premium Aluminium and Powder Coating materials.
Functionality is also a key aspect of the 257 THREE ST, with premium fenders and an integrated rear carrier that blend style and practicality. The kickstand adds an extra layer of convenience for daily use.
The bike's belt drivetrain and integrated gear hub provide a reliable and low-maintenance riding experience. These features are not affected by wet weather or elements, so you can enjoy a reliable ride with minimal maintenance.
In summary, the 257 THREE ST is an excellent bike for daily urban rides, with a stylish Swiss Design, durable construction, functional features, and reliable performance.
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 PFR300 rims and Shimano Nexus 8 rear hub |
| Tyres | Pirelli Angel GT - 37mm, Clearance for 42mm (Measured Width) |
| Rear Derailleur | Shimano Nexus 8-speed internal hub |
| Shift Levers | Shimano Alfine 8 Rapidfire Plus |
| Brake Levers | Shimano MT200 |
| Brakes | Shimano Hydraulic MT200/ RT10 Rotors (160/160) |
| Chain | Belt Gates 120 CDX |
| Cassette | Gates SUREFIT 3-LOBE UNIFIED CDX2 4T |
| Crankset | Gates S150 CDN 55T |
| Saddle | Selle Royal Vivo Women's |
| Seatpost | BMC LSP 02 |
| Stem | BMC RSM01 |
| Handlebar | BMC LSB 03 |
| 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.