The reviewers/riders write it is a tough rim. I prefer the drum brake over the thiny bicycle disks. I doubt the parts undergo X-Ray, but riders could if the part fails. Checking on the roller brakes for the rear; oddly, these are a new development. Anyway, I plan on 30mph or less with a 5mph margin of error, I would do the moped hubs if I wanted to go faster without maintenance time increasing for safety. Next up an Earles fork to go with the wheel, I hope.