Hello
Thanks for your patience.
From the images supplied our colleagues are happy that the finish is normal on the rim bed. It is where the rim is held during the manufacturing process and as its an alloy it will not oxidise easily.
When using a tubeless tyre with sealant it is recommended that the sealant be replaced regularly, this is usually stated by the sealant manufacturer on the bottle, and at this time the old sealant should be removed and the internal rim and tyre cleaned off before adding the new sealant.
I hope that this helps and please let us know if there is anything we can help with or if you have any further questions.
Regards,
Ben
Mavic Customer Care
www.mavic.com