I just ran them in my kyosho buggy and truggy at P-Hill pro series race. i use the stock kyosho nut and flywheel. The holes on the shoes need reemed a thousant and a spacer on the clutch nut. but they work flawlessly. they have very little wear after a whole race weekend. perform better than any other clutch shoe ive tried. by the way good run this weekend Chris your truggy looked great.