I don't know if this is common knowledge, but some police force have galleries of stolen bikes and parts that they have recovered.
South Wales Police recently posted this on Facebook:
Your wheels?
20 photos ·
Updated 22 hours ago
Here’s a gallery of bikes that we’ve recovered. We suspect they were stolen at some point and we’d like nothing more than to be able to return them to the rightful owners. The added bonus is that we can link the bikes to actual thefts and put those we recover them from before the courts. Do you think any of these are yours? Call Pc Samantha Hamilton via 101 if you do. Maybe one of your Facebook friends will recognise something so feel free to share the post. Remember, bike parts may have been changed so there may be aspects of the bike which you don't recognise. Want to increase your chances of us finding you if we recover your stolen bike? Register your bike at
www.immobilise.com
https://www.facebook.com/1618086331808624/photos/?tab=album&album_id=1875226422761279
Good luck!