I have a Suzuki VanVan 200 and have a cover for it. I tried it on my RR and it was perfect. It even cinches around the bottom in case you store yours with the wheels off the ground. So I recommend this size of a motorcycle cover. It's easy to Google. Some of them even come with a metal cord around the bottom for alarms. And most are for indoor & outdoor use. Here's one on Amazon.
https://amzn.to/3j2hb3O
https://amzn.to/3j2hb3O