Unknown Bass-X Black | Fixed Gear & Single Speed Bike

Signature Urban Frame — Black Edition

The Unknown Bass-X Black is a versatile urban fixed gear bike built for riders who want comfort and style for everyday riding. The sleek black and white colourway gives it a clean, understated look that fits right in on city streets. Unlike aggressive track frames, the Bass-X features a relaxed frame geometry designed for comfortable commuting and long rides. Built around a hardened 6066-T6 aluminum frame with a full carbon fork, delivering a smooth ride at just 8kg in size M.

Performance Components

The Bass-X delivers premium components at a mid-range price. The full 12K carbon fork takes the edge off rough roads and gives you sharp, confident steering — a big step up from alloy forks at this price point. The sealed-bearing Mushroom hub wheelset with Japanese bearings keeps everything rolling smoothly, and the 46t/17t gearing is perfectly tuned for flat urban riding. The flip flop hub gives you the freedom to switch between fixed gear and single speed by flipping the rear wheel — fixed for the full experience, single speed when you want to coast.

Full Carbon Fork

European Bass-X builds ship with the full carbon fork as standard instead of the alloy version. You will feel the difference immediately — smoother rides, better handling, and a more premium look.

What's Included

Shipped with drop bars, brakes, and free pedals with foot straps worth €50 included. Built up and ready to ride.

Weight: 8 kg in size M (without pedals)

*Graphics on the frame may differ slightly from photos.

Specifications

• Frame: Unknown Bass-X, 6066 T6
• Fork: Unknown Full Carbon Fork, 30mm rake, 1 1/8"
• Headset: Integrated Unknown, SB, 45x45st., 1 1/8"
• Stem: Unknown 90mm
• Handlebars: Unknown Compact 420mm
• Grip: Unknown Carbon
• Brake levers: ZST single speed
• Brakes: Unknown 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
✅ Relaxed city cruising with a minimalist aesthetic

Size Chart