529 Garage in Nelson which is a free web based registration system created in Canada and proven to reduce bike theft by 40%. Unfortunately, even a locked bike can be stolen, so registering your bike can help.

529 Garage helps the cycling community to reduce bike theft. You can register bike details and serial numbers, in the event your bike is stolen you can notify the 529 Garage community by creating an alert. Then if the thief tries to sell the stolen bike, potential buyers can search 529 Garage to check if the bike is stolen. This will help to deter thieves as they find they have a much smaller market to sell to. Members of the 529 Garage community and Police can check bikes and if they are stolen, notify the owner and reunite them with their bike.

Bike registration is free and a 529 Shield sticker is an optional, tamper-resistant, weather-resistant decal that has a unique, seven-character ID code. It adds an extra identifier and layer of protection for your bike. The 529 Shield sticker can be purchased from all good bike stores, we recommend you put one on your bike in a visible location. Always report bike thefts to Police, if the theft is happening now call 111 otherwise call 105 or go online to 105.police.govt.nz.

Bicycle registration for the life of your bike | 529 Garage (project529.com)

105 Police Non-Emergency | New Zealand Police