Hey All,,, thanks for all the good input and advise. I was just hoping that someone had already replaced a headset on a Denali.

Update,,, this weekend I'll disassemble and measure. I have a good idea that it will be ISO 30.2mm. Reason is that my stem quill is 22.2mm and a JIS quill is 22.0mm which indicates mine is ISO. Also, as one poster suggested "just sand out the 0.2mm".

Whatever, I'm good and thanks again.