You can ride up to where the stone pitched steps start. After that, it is a carry. I like to head up to the summit then ride along the ridge. When I last did it two years ago, it was pretty much bog free. You just need to chose a dry spell or a hard frozen ground day.
I rode Cnap Coire Na Spreidh last week. I loved it. There is some really nice singletrack along the shoulder. I cut off just after what remains of the plantation. I should have cut off just before. It’s a bit boggy from the lochan up onto the shoulder of the small rise on the way to the mid car park but it was over very quickly. I really enjoyed it having been up MacDui and Cairngorm earlier in the ride. I had no real expectations so the singletrack came as a very pleasant surprise. I just wish it extended down to Ryvoan. Perhaps a petrol strimmer is required? 😀
Cheers
Sanny