---
title: "Checking a bike frame number before buying: what you need to know"
description: "Why you should always check a bike’s frame number before buying and how to do it the right way. Netherlands's #1 bike registration platform!"
canonical: "https://www.bikebaze.nl/en/blog/checking-a-bike-frame-number-before-buying-what-you-need-to-know"
published: "2025-12-19T11:57:05.000Z"
---

# Checking a bike frame number before buying: what you need to know

Before buying any second-hand bike or marketplace listing, locate the frame number, write it down exactly, and verify it in a bike registration database like BIKEBAZE to confirm it is not reported stolen. A missing or filed-off frame number is a serious red flag, so walk away.

**Direct answer:** When buying a bike, it is important to check the frame number. This helps you avoid purchasing a stolen bike and ensures everything is legitimate.

## When should you check a frame number?

Always check the frame number when:

- Buying a secondhand bike
- Purchasing via online marketplaces
- The bike has no proof of purchase

## How do you check a frame number?

You can check a frame number by:

1. Locating the number on the bike
2. Writing it down exactly
3. Checking it in a bike registration database
4. Verifying whether the bike is reported stolen

## What if the frame number is missing?

A missing or removed frame number is a serious red flag and often indicates theft.

## Extra protection

Registering your bike with unique identifying features increases recovery chances and reduces resale risk.