Originally Posted by Kogswell
highish BB (5.0-5.5 cm drop)
So we have 28mm and 52mm. Anyone else?
Just to be clear.
Bottom brackets are measured two ways; by height (floor to center of BB) and drop (horizontal line thru axles to center of BB).
So, BB height = ~ 28
cm and BB drop = 5-5.5
mm
Americans usually measure BB drop; Italians BB height. I know its confusing...
So, 28mm makes no sense for a drop or height measurement. 52mm is ok, but the standards are 50mm or 55mm for a drop.
To be on the safe side, use 50mm drop.
Threadless is the new standard at the track. Trackies are running OS or road handlebars these days. Its easy enough to switch out stems and handlebars.
If you are going to tig weld to keep costs down, might as well go OS, since you will be using 9/8" HT.
Also, the issue of good track ends are way important.
Paragon makes a nice track end with relieved plates.