Park's Big Blue Book on page 185 states "For steel and aluminum steering columns, do not exceed 40mm between the stem and headset."
My question is: Does anyone know the rational for Parks 40mm spacing maximum?
On my bike build my headset-to-stem height is closer to 80mm as can be seen in the picture. I purposely left the column uncut until I found out more about fit. I'm resonably comfortable with the handlebar height but would more likely go for higher than lower if I did decide to change and do it by a bar or stem change as I can't afford Parks 'cut-it-longer' tool or their 'column stretcher' tool. Having just come across the Park statement, I am trying to understand the why so I can make an intelligent decision. Anyone have insight on this? Thanks for any input.