BMC 257 Urbanchallenge AL TWO ST

With its clean looks, exacting attention to detail and functional integration, the 257 TWO ST is your partner in crime for urban rides. Its Premium Aluminium frame is light, versatile and powder coated for durability. Integrated StVZO certified lights, premium fenders and the intuitive SRAM Apex 1 single chainring groupset gives you that joyful elegant feeling of velocity and safety.

Swiss Design
Stand out in style with a minimalist yet iconic Swiss Design.

Durable
257 bikes use Premium Aluminium and Powder Coating for superior durability.

Safe
The 257 series is equipped with a powerful front light and a high-visibility rear light. The perfect combination of style, functionality and look to add safety in the urban environment. The built-in lights are powered by the internal battery and have StvZo Certification.

Functional
257 bikes are equipped with premium fenders and integrated rear carrier to blend style and functionality. Kickstands further improve ease during daily use.

Simple
Single chainring drivetrains with 11 speed cassettes provide the gearing range you need in a clean-looking, lightweight and easy-to-use package.

Full Specifications

Frame
257 Premium Aluminium Smoothwelded
Staggered Top Tube
Powder Coat Finish
Internal Cable Routing
BSA Threaded Bottom Bracket
Flat Mount Disc
12x142mm Thru-Axle

Fork
257 Premium Aluminium
Fender Mounts
Flat Mount Disc
12x100mm Thru-Axle

Gears: 1x11
Chainwheel: SRAM Apex 1 40T
Cassette: SRAM PG-1130 11-42T
Chain: SRAM APEX 11 Speed
Rear Derailleur: SRAM APEX 1 Long Cage
Shifters: SRAM Gx Eagle
Brakes: Magura MT4 - Storm Rotors (180/160)
Handlebar: Lightskin with Integrated Lights
Stem: BMC MSM01 Stem
Seatpost: Lightskin with Integrated Lights
Saddle: Selle Royal Vivo Women's
Hubs: CL-712 / RXC-142S
Rims: SR500
Tires: Pirelli Angel GT - 37mm
Tire Clearance: 42mm (Measured Width)
Extras: Fenders with Integrated Rack, Lights and Kickstand
Weight Limit: 120 Kg
ASTM Classification: Level 2

Technical Details & Manuals

Frameset
257 premium aluminum frame (classic and staggered versions)
257 premium aluminum fork

Technical Details
Powder coated finish for superior durability
Internal cable management
Round seatpost, 31.6 mm
External seat clamp
Fender mounts
Kickstand mount
Rack mounts
ASTM level 2

Compatibility
Frame, Fork and Seatpost
Tapered fork with round 1-1/8" steerer, flat mount
Compatible with belt drive (specific dropouts)
Seatpost: 31.6 mm
BSA threaded bottom bracket

Brakes
Front brake: post mount, 160 mm rotors
Rear brake: post mount, 160 mm rotors

Wheels and Axles
Maximum tire clearance 42 mm (actual measured width), 38 mm with fenders
Front thru-axle: 12x100 mm (diameter/frame spacing)
Rear thru-axle: 12x142 mm (diameter/frame spacing)