Many of you have suggested that I offer an 18" griddle and I may just do that. Just to make it clear, the Mojoe Griddle works just as well on an 18" Weber as it does on a 22".
The three mounting bars welded to the bottom of the griddle are 8" long so that the griddle can be mounted on heat sources with smaller rims than the 22" diameter of the standard Weber. These heat sources include single burner propane stoves such as a deep fat turkey fryer burner or the standard two burner Camp Chef style stove as well as the 18" Weber. The Mojoe Griddle performs very well on highly centralized heat sources such as these because it is made with 1/4" hot rolled steel plate. This material is highly efficient in transferring heat from the center heat source out to the rim edge. Cast iron can't do that nearly as well.
Secondly, even a small reduction in griddle diameter drastically reduces the cooking surface area and one of my main selling points is a large cooking surface not available from anyone else. The 24" Mojoe Griddle has pi sq. ft. (3.1416 sq. ft.) of cooking surface. That's 452 square inches. An 18" diameter griddle would have only 254 sq. inches, a reduction in surface area of 44%!
Also, any bigger than 24", the Mojoe Griddle will not be able to be carried vertically (using one handle) because it will scrape the ground. The weight will also increase as the square of the radius. I think I am already at the upper limit as to the weight (35 lbs) that most people will comfortably carry.
A smaller griddle will probably be in the future because, from your comments, there is a market for it.
Cam