Oneup components dh blockoneup components dh block converts a 9 10 or 11 speed mountain cassette to a 6 or 7 speed downhill cassette with integrated spoke protector and 2 tooth jumps through the majority of the cassette get faster more responsive shifting no more multiple shifts to find the right gear oneup components is a small team of passionate mountain bikers dedicated to bringing genuine value to the mtb market oneup was founded by three former race face engineers chris john and s