I saw a post about subframes and that got me wondering about the main frame of a motorcycle. I realise that if the main frame is scratched/hit, insurance companies will by and large write the bike off etc and resale will be very hard. What if you didn't want the bike written off / can't make a claim (e.g track day)/ whatever reason and wanted to replace the frame - I know you can buy the frames separately. My question is, what about the VIN on the existing frame? What is the process of getting a new frame and does it come with a new VIN etc? Obviously keeping the bike road legal.