That is a good question. I wish I had the answer. Information like that would be nice to know. I suppose I could say … “your guess is as good as mine”, but I reckon that wouldn’t be very helpful. I have tried a few different times looking up information about tires and rims and pretty much concluded that I must be dumber than I thought as I couldn’t make much out of most of what I read. It just seems to get pretty technical and complicated. I find it quite challenging trying to make sense out of all of it. It was pretty simple when I was a kid, but thru the years man has managed to make it quite complicated. You can try your hand at it if you want. Perhaps you will have more success than I have had in the past. My best advice is to go ask someone who works with this and has some understanding of it. That being said, don’t be surprised if they don’t know of a certainty the answer to your question.
But this much I know … more and more it seems as though people are moving toward wider tires on their trikes … trying to remake their trikes into “mini-FAT trikes”. I can understand and appreciate that, but hey, a rim can only handle so much additional width without concern of safety and performance.
HERE is Schwalbe’s article on this.
You can read the late Sheldon Brown’s article HERE.
There are some formulas for calculation HERE.
HERE is another good article on tire width and rim size.
Here are some things I have learned. Some of it is just common sense and logic.
Tires are designed to have a certain shape when they are properly inflated on the rim. If the tire is too narrow traction and stability when cornering will suffer. If the tire bead is too wide where is fits down into the rim the tire will be deformed from the way it was designed and the tread will be effected. Impact absorption will suffer as will control during cornering. Sidewalls can be more easily damaged and cut. A proper fitting tire on a rim will ensure maximum performance in cornering and traction as well as provide the least rolling resistance. Tires are designed to have a certain shape when properly mounted and inflated. When we modify things we can effect our safety in the performance and handling of the tire.
A wider tire has less rolling resistance than a narrower one of the same “build” and air pressure. A wider tire will also help prevent pinch flats.
Yeah, I wish I could give you a quick and accurate response, but the truth is “your guess is as good as mine”. Well, hopefully we can all …
KEEP ON TRIKIN’