On One Pompino owners...

Yes, it's a pump nipple - for a frame pump. Bro do you even old bikes?

no bro i don't even old bikes :( although this was one of my thoughts i cant but see how its going to mount it theres nothing the other side to also grapple, it its now a #deathspike shame it isn't on the front then i could hurt pedestrians with it!

They all taper to 22.2mm where the levers fit, as noted above the amount you can cut off before running out of 22.2 section varies.

yeah thought that would be the case, i'll just have to look carefully at the risers i'm buying then and make sure they taper as quickly as possible