In the Netherlands, a frame number has been used as the standard notation since 2006. Since then, it has been composed of 2 letters followed by 7 digits. For Cortina bikes, this is, for example, CO1234567. Bikes from before 2006 have a different number per bike brand, and the location where you can find the frame number on the bike is also different.
A frame number is mandatory in the Netherlands and is registered with the RDW. They are unique to each bike and are listed in Cortina as a barcode sticker at the bottom of the sloping tube of the frame (see image). We therefore recommend that you always note your frame number and, if the bike is stolen, report it stating your frame number. The frame number was introduced to prevent bicycle theft and make recovered bikes easier to return to their rightful owner. If you plan to buy a second-hand bike, please always check first whether it has not been stolen in the Vehicle theft register of the RDW.
Where can you find the tire sizes?
On the side of your outer tire you often find a series of numbers, for example 37-622. This is called the ETRTO size (European Tire and Rim Technical Organization). The first value (e.g. 37) indicates the width of the tire in millimeters, and the second value (e.g. 622) is the diameter of the tire in millimeters.
Another measure you might encounter is, for example, 28 x 1.40. This is the English measurement system, where 28 is the diameter of the tire in inches, and 1.40 is the width in inches. When buying a inner tube, make sure that both the diameter and the width match the specifications on your outer tire.
The place where the sticker with the frame number is located on a Cortina bike. Here you will find a barcode with the frame number next to it; this consists of CO-(and 7 digits).
Sometimes the frame number is confused with the color code or type code on the bike. These indicate the color and type of the bike but do not contain any unique information about your bike (think of the date of purchase and the model year).
Are you looking for a specific part for your Cortina bike? Based on the frame number, we can easily find the matching part. Request your Cortina part here
Do you have any further questions about the frame number or can't find it? Please contact us. Our specialist helpdesk is happy to assist you.
