I've not done the whole thing! Have done the north and east sectors though, and am pretty familiar with the rest of the areas it covers. I'd definitely take my MTB for the central loop!
There's some tricky bits on the outer loop too but there's plenty of road options for the rough bits . I'm planning another crack at doing it in one in August , I bailed with about 20 miles to go last time.
I've not done the whole thing! Have done the north and east sectors though, and am pretty familiar with the rest of the areas it covers. I'd definitely take my MTB for the central loop!