Current Projects chat and miscellany

Not sure if it makes a difference but is the Campag 111mm BB asymmetrical? Also what hubs are you running?

The 7600/10 BB is 109mm. It's ISO. Others have used JIS taper BBs like the Shimano UNs (check the transmission database) but they use shorter spindle lengths as ISO cranks sit further out on JIS tapers. Using an ISO 114mm spindled BB would throw it way off. No?

Ok, I've just woken up so bare with me.

I think Campag 111mm is symmetrical, don't think the drive side is any longer than the non-drive, though I'm not sure.

I'm not sure that the 7600 BB is ISO, I've never seen any real supporting evidence, just peoples opinions.

On the point about UN BB's, and people using shorter spindles; the shimano un54 110mm BB gives a pretty straight chainline with the 7600 cranks. The un54 107mm BB also gives a pretty straight chainline, but that is because the 107 isn't symmetrical. Both the 107mm and the 110mm have the exact same drive side spindle length. IMO that is just further proof that the DA 7600 cranks are either JIS, or somewhere between JIS and ISO.

I haven't actually received my 7600 cranks yet, but I have both a Campag 111mm, and a un54 107 (which I plan to try first) so I will experiment for myself.

If the cranks are in-between ISO and JIS, I think using a JIS is the lesser of 2 evils.