[Excaliber]

Not sure how BIG you can go, it's a question best directed to Classic Roadsters II. Perhaps you can contact them directly through their web site.

Another way would be to search here for information concerning Classic Roadster tire size. But that could take a LONG time and may not fully answer the question.

I ordered tires for mine and they were to big, I was stuck with them! Others have had the same experience with other makes, like FFR is limited on tire size.

You DO need to be careful before you buy the wrong size.