Originally Posted by
PatrickGSR94
I didn't look that close before I started the fit process on my Z85, but I think the original stem that came on mine had a shim like that. But we changed to a shorter Bontrager stem and it fits fine. I do notice that the Felt headset top cap overhangs the edges of the Bontrager stem just a bit, probably because the Felt stem was slightly larger to accommodate that shim.
In short any standard 1-1/8" steerer stem should work perfectly.
Yeah, the top cap on these adjustable stems have a larger diameter to match the stem's larger diameter. If you switch to a standard stem, you should probably also get a standard top cap to match, though I guess it doesn't matter as much if your top cap is too big rather than too small.