I had both a ABC Hobby Mini Genetic and still have my RC18R. If you had asked this about two months ago, I would have been able to post a picture of the two side by side. They are relatively close in size, but the RC18R is about an inch or so shorter in length than the shortest wheelbased mini and the width is maybe about a 1/2 inch narrower than a mini. I hope that gives you a better idea. I got rid of my mini because parts are harder to come by for the ABC car.