With the invention of the A headset and the demise of the quill stem so went the adjust ability of stem height until now. With the ATS solution www.nvocomponents.com you have unlimited stem height adjustment with any threadless system. This helps with all the new bikes that have super short head tubes to help shave wt and only give you a small amount of stack ht and allows you not to have that ridiculous MTB stem look on your over priced Italian carbon bike