Here is more than you will ever want to know with pic about the differences between Ct and a MC rim & tire construction with a whole lot more thrown in. This guy went to a lot of time and effort to do this and is a good read.
http://www.goldwingfacts.com/forums/...-rim-tire.html
I have been a darksider on all my other steel steeds at one time or another and probably will be again on my F6B and now after reading the article a much more informed darksider about the construction of CT verses MC tires and their respective rims.