I bought tracker 184s and 54mm keyframes to go on my bigfoot deck. I changed the bushings and put in my old mini logo bottom/bones hard top set up without any washers and it makes the trackers ride good. I wanted to try the trackers cause they're a quarter inch more narrow than 215s. I took off my old rictas and to my surprise they're labeled 52mm, -I ordered 54s and I never checked them ha, 54s look big. I like the 54 key frames.