Unknown SC-1 Green | 4130 Chromoly Fixie & Single Speed

Signature Urban Frame — Green Edition

The Unknown SC-1 Green is a tough, reliable fixie built for everyday riding. The deep green finish gives this bike a cool, understated look that works in any setting — from campus to city centre. Built from 4130 chromoly steel, the SC-1 is engineered to handle the daily demands of urban commuting while staying comfortable on longer rides. At 9.4kg in size M, it is one of the lightest steel fixies in its class.

Built to Last

Chromoly steel is prized for its strength and natural vibration dampening — it gives you a noticeably smoother ride than aluminum on rough city roads. The steel fork complements the frame with stable, predictable handling you can trust in traffic. The sealed-bearing Mushroom hub wheelset with Japanese bearings ensures effortless rolling ride after ride.

Ride Fixed or Single Speed

The SC-1 comes with a flip flop hub, giving you the freedom to ride fixed gear or flip the rear wheel for single speed. Great if you are just getting into fixed gear riding and want the option to coast, or if you like switching between the two. The 46t/17t gearing is well suited for flat city riding.

What's Included

Shipped with front and rear brakes, and free pedals with foot straps worth €50 included. Plus free front and rear lights worth €20 included. Ready to ride straight out of the box.

Weight: 9.4 kg in size M (without pedals and brakes)

*Graphics on the frame may differ slightly from photos.

Specifications

• Frame: Unknown SC-1, 4130 chromoly steel
• Fork: Unknown steel fork, 30mm rake, 1 1/8"
• Headset: Integrated Unknown, SB, 45x45st., 1 1/8"
• Stem: Unknown 60mm
• Handlebars: Unknown riser bars
• Grip: Unknown
• Brake levers: ZST single speed
• Brakes: Unknown front and rear brake set
• Chainarm: Unknown 165mm, 130BCD
• Chainwheel: Unknown 46t, 130BCD, 1/2"x1/8"
• Chain: KMC Z510 1/2"x1/8"
• Rear cog: 17t
• Rims: Unknown 28d
• Hubs: Unknown Fix/Free flip flop 28d, SB
• Tires: 23c
• Seatpost: Unknown 27.2mm, 300mm, 20mm offset
• Saddle: Unknown
• Bottom bracket: 68x103mm, BSA, Square taper

Best Use Cases

✅ Daily urban commuting
✅ Fixed-gear / Single-speed riding
✅ First fixie for beginners
✅ Long rides with friends

Size Chart