Frequently Asked Questions
What is a fixed gear bike?
A fixed gear bike (fixie) is a bicycle with no freewheel mechanism — the pedals are directly connected to the rear wheel. When the wheel turns, the pedals turn too. This gives riders a direct, connected riding experience with better control and feedback. Fixed gear bikes are lighter, simpler, and require less maintenance than traditional geared bikes.
What is the difference between fixed gear and single speed?
A fixed gear bike has no freewheel, so the pedals always move when the wheel moves — you cannot coast. A single speed bike has one gear but includes a freewheel, so you can coast without pedalling. Several of our bikes including the Singularity, Bass-X, and SC-1 come with a flip flop hub, letting you switch between fixed gear and single speed by flipping the rear wheel.
Do you ship throughout Europe?
Yes! Unknown Bikes Europe ships to all EU countries. Orders are dispatched from our European warehouse for fast delivery times. Check our terms and conditions for full shipping details.
What size fixed gear bike do I need?
Frame size depends on your height. Here is a general guide:
| Frame Size | Rider Height |
|---|---|
| 52–53 | 152cm – 168cm |
| 55 | 166cm – 178cm |
| 58–59 | 176cm – 190cm |
| 61–62 | 183cm – 200cm |
Sizes vary slightly between models — check the size chart on each product page for exact measurements. Contact us if you need help choosing.
Are fixed gear bikes good for commuting?
Absolutely! Fixed gear bikes are ideal for urban commuting. They are lightweight, low maintenance, and reliable — fewer components means fewer things that can break. Our SC-1 and Bass-X are particularly popular with commuters thanks to their comfortable geometry and included brakes.
What is the difference between the SC-1, Singularity, Bass-X, and LV3?
- SC-1 (€399) — Entry-level 4130 chromoly steel fixie with steel fork, flip flop hub, front and rear brakes. Perfect for beginners and daily commuters.
- Bass-X (€749) — Versatile urban bike with 6066-T6 aluminum frame, full carbon fork, flip flop hub, relaxed geometry for comfortable riding.
- Singularity (€949–999) — Premium track bike with 6066-T6 aluminum frame, carbon/alloy fork, Fix/Free hub, integrated aero seatpost. 7.5kg.
- LV3 (€1,249–1,299) — Our flagship. 6066-T6 aluminum frame, full 12K carbon fork, sealed-bearing wheelset. 8kg. Built for racing and serious riders.
Do your bikes come with pedals?
Yes! Every complete bicycle ships with free pedals and foot straps worth €50. The SC-1 also includes free front and rear lights worth €20.
Do your bikes come with brakes?
Yes. All our complete bikes ship with brakes. The SC-1 includes both front and rear brakes. The Singularity, Bass-X, and LV3 ship with drop bars and a brake set.
What is a flip flop hub?
A flip flop hub has a fixed cog on one side and a freewheel thread on the other. By removing the rear wheel and flipping it around, you can switch between fixed gear (no coasting) and single speed (coasting). The SC-1, Bass-X, and Singularity all come with flip flop hubs.
What does 4130 chromoly mean?
4130 chromoly is a type of steel alloy containing chromium and molybdenum. It is stronger and lighter than standard steel, making it the preferred choice for bike frames that need to be tough and durable. Our SC-1 uses 4130 chromoly for a frame that absorbs road vibration naturally and will last for years.
What is 6066-T6 aluminum?
6066-T6 is a high-grade aluminum alloy that is heat-treated for extra strength and hardness. It is lighter and stiffer than steel, making it ideal for performance-oriented fixed gear frames. Our Singularity, Bass-X, and LV3 all use 6066-T6 aluminum frames.
What is your return policy?
We offer hassle-free returns and exchanges. Visit our return and exchange policy page for full details.
How do I contact you?
You can reach us through our contact page. We are happy to help with sizing advice, product questions, or anything else!