Atomlab Pimp Rear Hubs include a steel 9speed cassette body and sealed bearings Axle bolts can be removed to run standard QR skewers Six-bolt standard disc mount; Shimano 9-speed-compatible cassette Machined bodies with big, reliable bearings Radial lacing does not void the manufacturer's warranty If you need any replacement parts for an Atomlab hub, email Atomlab at _info@atomlab.com_ with a description or photo of your hub along with a list of the parts you need and they will email you back the price and availability