I’m in hot pursuit of a drawing/specification for the quasi-standard that is the 8 lobed tapered spline that we see on the end of a bb30 spindle; something like this
I want this because I want to draw and have made a pair of cranks which can interface with existing available spindles.
I am not interested in information about the bb or frame standards, that is readily available with a quick google search.
the best/closest resource i’ve found is this thread on Vital MTB
https://www.vitalmtb.com/forums/hub/bb30-standard
most of the thread is spent explaining that the frame/bb standard people keep posting isn’t what is being looked for… but there is a post at the bottom with the beginnings of a drawing.
I’m not near anyone I could recruit to machine this, and shipping to/from my part of the world is a total joke (6 months corrupt customs delay not unheard of)… so I’m trying to avoid a test cut here; ideally a drawing with SOME verification would go some way towards minimising the ever growing amount of scrap I see to produce
willing to share finished designs if my incredibly esoteric wants are something anyone is interested in too… ( yes, these are for my adjustable bb height track bike)