# Where is the frame number on a Frog bike?

Canonical: https://www.cyclesite.co.uk/trust/frame-numbers/frog
Last reviewed: 2026-07-02

**Quick answer:** The frame number on a Frog bike is usually underneath the bottom bracket, between the pedals. Look for a stamped code or a barcode sticker with a unique mix of letters and numbers, and copy the full serial exactly before you check or register the bike.

Most Frog bike frame numbers are found underneath the frame, near the bottom bracket, where the pedal cranks pass through the frame. Frog makes lightweight children’s bikes that hold their value strongly, so they are bought and sold used constantly and are a common theft target, which makes a frame-number check well worth it. Turn the bike carefully upside down and look between the pedals for a stamped code or a barcode sticker.

## Start under the bottom bracket.

This is the most common place to find a Frog 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 Frog registration email or paperwork.
- With the Frog dealer that sold the bike.

## What a Frog frame number looks like

A Frog frame number is normally a string of letters and numbers, either stamped into the underside of the bottom bracket area or printed on a barcode sticker. You need the full unique code, not the model number that tells you the wheel size.

### Not the frame number

- Frog 44
- Frog 53
- Frog 62
- Frog Road
- Frog Track
- 16 inch
- 20 inch
- Wheel size markings
- Shop stock labels

## Buying a used Frog

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 Frog 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 Frog can be a brilliant buy, but the frame number is the detail that protects you.

## Frequently asked questions

### Is a Frog 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 Frog bikes have a frame number?

Most Frog 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.

### Is the Frog model number the same as the frame number?

No. The number in a Frog model name, like Frog 44 or Frog 53, refers to the wheel or inseam size, not the unique frame number. The frame number is the individual serial stamped or stickered on the frame, usually near the bottom bracket.

### Where is the frame number on a Frog Road?

On most Frog Road bikes, check underneath the bottom bracket first, the area between the pedals on the underside of the frame.

### What if the Frog 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 Frog 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 Frog bike in the UK?

Find the frame number using the locations described above, then record it against your Frog. 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 Frog is worth: https://www.cyclesite.co.uk/value/frog
- Stolen Frog bikes: how to check one before you buy: https://www.cyclesite.co.uk/stolen-bikes/guide/stolen-bikes-by-brand-frog
- Used Frog prices by model: https://www.cyclesite.co.uk/value/frog
- Frame numbers for other brands: https://www.cyclesite.co.uk/trust/frame-numbers

Source: Cyclesite editorial, reviewed 2026-07-02. HTML version: https://www.cyclesite.co.uk/trust/frame-numbers/frog