# Where is the frame number on a Radon bike?

Canonical: https://www.cyclesite.co.uk/trust/frame-numbers/radon
Last reviewed: 2026-08-05

**Quick answer:** The frame number on a Radon is usually underneath the bottom bracket, or on the underside of the down tube on full-suspension models. As a direct-sold brand, the order confirmation is an important part of proving ownership.

On a Radon, check underneath the bottom bracket first, then the underside of the down tube and the head tube. Radon sells direct rather than through shops, so alongside the frame number keep the original order confirmation: there is no dealer who can vouch for the sale later.

## Start under the bottom bracket.

This is the most common place to find a Radon frame number. It is the part of the frame between the pedals, on the underside.

1. Put the bike somewhere safe and well lit.
2. Turn it upside down carefully, or place it in a workstand.
3. Look underneath the frame where the cranks meet the bike.
4. Wipe away mud, grease or road dirt.
5. Use a phone torch if the number is hard to read.
6. Take a clear photo before typing the number into a checker.

### If it is not under the bottom bracket

- Near the rear dropouts, where the back wheel fits into the frame.
- Around the seat tube.
- On the underside of the down tube.
- Near the head tube at the front of the bike.
- On the original sales receipt.
- In your Radon registration email or paperwork.
- With the Radon dealer that sold the bike.

## What a Radon frame number looks like

A unique alphanumeric code stamped or etched into the frame. Radon does not publish a public serial format, so use the complete code as shown.

### Not the frame number

- Radon Slide
- Radon Jealous
- Radon Skeen
- Radon Vaillant
- Frame size
- Shock serial number
- Fork serial number
- Component code

## Buying a used Radon

A clean-looking bike is not always a safe buy. Before you pay, ask the seller for a clear photo of the frame number and check it against stolen-bike records. You should also ask for:

- The original receipt or proof of purchase.
- The seller’s name matching the receipt where possible.
- Clear photos of the bike from both sides.
- A photo of the frame number.
- Any service history.
- Details of upgrades or replacement parts.

## Bottom line

The quickest place to find a Radon frame number is underneath the bike, near the pedals. Look for a stamped code or barcode sticker, copy the full number, then check it before you buy, sell or register the bike. A used Radon can be a brilliant buy, but the frame number is the detail that protects you.

## Frequently asked questions

### Is a Radon frame number the same as a serial number?

Yes. Most people use frame number and serial number to mean the same thing. It is the unique identifying code attached to the bike frame.

### Do all Radon bikes have a frame number?

Most Radon bikes have a frame number or serial number. Check the locations described above first; on older frames the marking can be shallow or worn, so clean the area and check in good light before concluding it is missing.

### What if the Radon frame number has been removed?

Do not buy the bike. A removed or damaged frame number is a major red flag. It may make the bike harder to register, insure, resell or prove as yours.

### Can I check if a Radon bike is stolen by the frame number?

Yes. Use the frame number to run a stolen-bike check before buying. You should also ask the seller for proof of ownership and check that the details match the bike.

### How do I register a Radon bike in the UK?

Find the frame number using the locations described above, then record it against your Radon. It is free, and you need an account so we know where to send the alert. If that exact number is ever reported stolen to us, we email you. If anyone then lists a bike carrying it, the listing is hidden until the seller proves it is theirs.

## Related pages

- Free stolen-bike check: https://www.cyclesite.co.uk/stolen-bikes
- What a used Radon is worth: https://www.cyclesite.co.uk/value/radon
- Stolen Radon bikes: how to check one before you buy: https://www.cyclesite.co.uk/stolen-bikes/guide/stolen-bikes-by-brand-radon
- Used Radon prices by model: https://www.cyclesite.co.uk/value/radon
- Frame numbers for other brands: https://www.cyclesite.co.uk/trust/frame-numbers

Source: Cyclesite editorial, reviewed 2026-08-05. HTML version: https://www.cyclesite.co.uk/trust/frame-numbers/radon