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Apparently even 30mm spindles fit BB86: http://rotorbike.com/catalog/default/rotor/road/bottom-brackets/bb86/bb86-press-fit-4130.html
Jaap-
Apparently
If you like very thin section bearings. It's a desperate move to get around a problem nobody in his right mind would give himself. We stopped using Octalink/ISIS because the bearing section was that thin.
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Can be done, but the normal 30mm BB30 spindle is too narrow for a BB86 shell width, the recent BB30a spindle/BB386/etc. may fit as they're wide enough.
As @mdcc_tester quite rightly said, the bearing is smaller and thus more prone to wearing out sooner than later (look at American Classic's hubs that use smaller bearing).
gbj_tester
edscoble
No room for a 30mm spindle