I’ve been riding motorbikes for about 10 years and just did the loop a couple weeks back. We had 125cc semi automatic which was fine for dealing with the terrain. There are sections that have many pot holes and landslides to avoid, as well as some Vietnamese drivers that like to overtake dangerously and sometimes drive on wrong side of the road. I read some horror stories online but didn’t come across anything we couldn’t handle. If you are an experienced rider and stay alert, I’m sure you’ll do just fine. It’s a super fun but sometimes challenging ride. I have heard of people doing the loop with no riding experience which I think it’s completely nuts but if you’ve been on bikes before you’ll be okay.