So the bottlecage bosses on my frame don't appear to have any threading. What size tap would I need to cut the standard size threading for the nuts used for bottlecages?
M5 and usually they are nutserts like these. As you can see the thread does not go the full length, this is to cater for the deformation when they are compressed to fit them.
So the bottlecage bosses on my frame don't appear to have any threading. What size tap would I need to cut the standard size threading for the nuts used for bottlecages?