Description

Signature Frame

The Unknown Bass-X is a versatile urban bike, designed with comfort and everyday use in mind. Featuring a lightweight 6066-T6 aluminum frame and a full carbon fork, it offers a smooth, responsive ride without the aggressive geometry typical of performance bikes. Its relaxed handling makes it perfect for city commuting, while maintaining style and durability. The frame's comfortable design ensures a smooth and enjoyable experience on urban streets. Ideal for riders seeking a mix of functionality, comfort, and performance.

Bicycle Components

Unknown Bicycles Bass-X Frame is made of high-grade, hardened Aluminum 6066 T6. The fork is our Carbon (12K) with 1 1/8” aluminum neck and features a 30mm rake. The headset is an integrated SB, 45x45. The fixed gear bike frame uses a 90mm stem and Unknown Compact 420mm handlebars. Included brake levers are ZST single speed with our Unknown brake set. The chain arm is 165mm and 130 BCD. The chain wheel is our Unknown 48 tooth, 130 BCD, at 0.5 x 1.125”. The rear cog has 17 teeth. The seat post and saddle are made by us at Unknown while the tires are 23c. The seat post measures 27.2mm x 300 mm with a 22mm offset. Included rims are Unknown fixed gear 28d rims. The bottom bracket is 68x103mm, BSA with a Square tapper.

Carbon Fork

We also opted for the full carbon fork instead of the standard alloy fork for the European market. This fork increases the price a bit, but it makes a big difference in performance and comfort, not to mention improving the overall look!

Weight

in size M is 8 kg | without pedals

Shipping

Bass-X Fixed Gear Bicycle is shipped with Dropbars and brakes.

*Free pedals with foot straps worth €50! - INCLUDED*

*graphics on the frame might be slightly different then on a 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
Wheelchain: Unknown 46t, 130BCD, 1/2"x1/8"
Chain: KMC Z510 1/2"x1/8"
Rear cog: 17t
Rims: Unknown 28d
Hubs: Unknown Fix 28d, SB - Freewheel not included
Tires: 23c
Seatpost: Unknown 27.2mm, 300mm, 20mm offset
Saddle: Unknown
Bottom bracket: 68x103mm, BSA, Square tapper

Best Use Cases:

✅ Fixed-gear / Single-speed riding
✅ Track racing / Velodrome
✅ Urban commuting with a minimalist aesthetic

Size chart

52	165cm - 175cm
55	173cm - 183cm
58	180cm - 190cm
60	188cm - 195cm