Originally Posted by
T-Mar
For future reference, all that has to be done to verify the presence of a Columbus steerer tube, is to remove the front wheel and look inside the bottom of the steerer tube for the presence of five helical ridges. After Columbus' patent expired other companies introduced ridge reinforced steerer tubes but they used use straight or different numbers of ridges.
ah that makes so much more sense than I thought. Good to know. And that picture makes it clear what these helical ridges look like, I always wondered. thanks tmar, you’re a legend