Quote:
Originally Posted by Wunder
That makes some sense, but what does an INBOARD T47 on the NDS even mean? My understanding of T47 is that it's a threaded system and if the bearing is inboard of the frame how would you manage to engage the wrench flats? BBRight uses either press in bearings (like PF30) or thread together inside the frame (my R3 uses this).
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Inboard T47i Cups (usually used on 86mm wide BB shells): You have roughly 1.5-2.5mm of tool purchase on the external flange/splines, and bearings are between the cups and the shell:
Outboard T47 Cups (usually on 68mm wide BB shells): You have the bearings fully outside the shell but still within the cups. The splines are also fully outside the shell, with toll purchase on the exterior cups or on flanges/splines depending on BB model
The T47a have one internal (NDS) and one internal (DS). They elected to go with the spline on the DS external cup instead of using the cup for installation, probably so you only need one tool for install:
Ceramic Speed shows the different models pretty clearly
https://ceramicspeed.com/collections...p.bb_type=T47a