Trying to remember, but it's been a while.

I feel like I had my Ergons on my trekking bars at one point, but had to file off that lip. But on a later build, I didn't bother with Ergons. The trekking bars are nice for all their various hand positions, but you can only get Ergon grips in one position, which may or may not end up being the position you use. I ended up just sliding some basic, flat grips on to the various places I was likely to grab, and that worked out for me.