Originally Posted by
maddog34
ummm... where's the Lockring on the NDS????
whether miche included one or not.... there SHOULD be a lockring on the NDS, and the DS cup will typically have a SHOULDER that butts up to the frame...
solution: get a better BB assy.that includes a shoulder and lockring.
That appears to be the direction forward. The stock Miche Primato BB from that era has no lock rings, nor is there space for them. When fitted to the frame, holding the cartridge in place, the stock mounting cups fit flush within the BB shell -
- not the best photo, but this is how these fit. And until the very end of last year they worked without issue for decades.
Originally Posted by
13ollocks
If the drive-side cup threads are ruined, this suggests that the cup didn't unscrew but was rather forced out, stripping the alloy threads. If the non-drive side cup has screwed itself further into the BB shell, that cup must have done the pushing - it's not going to get "sucked in" as the drive-side cup moves out. I wonder are we seeing some aggressive non-drive side precession screwing the NDS cup in and forcing the DS cup out? I've never seen this happen before, but how else were the DS threads damaged?
That describes what I am seeing. The original alloy drive side cup wobbled loosely in the shell. The replacement cup threaded in smoothly and correctly when I installed it. When I removed it yesterday it was shedding threads and wobbled like a loose tooth.
Originally Posted by
maddog34
do they migrate like the one imaged?
i always add a lockring if there's room.
there's usually room....
btw... BOTH threaded BBs currently offered by Miche show a SHOULDER on the DS cup..
and look at the image on the BOX the op posted... Shoulder and Lock Ring.
And the operative word here is current. Trawling online I learned that my cranks and bottom bracket are the first iteration of this crankset - ISO spindle, 135 BCD cranks. I bought this setup c.2005 from the guy who runs/ran Business Cycles, and not for the first time have I regretted letting him talk me into these instead of the TA Alize track crankset with the Axix BB and 130 BCD. Anyway, c.2007 Miche went to 144 BCD on the Primato Pista, and for 2013 they went to a JIS taper on the spindle. I am sure they redesigned the BB along the way to include flanges or lock rings.
Originally Posted by
13ollocks
neither Campag BB had room for an NDS lock ring nor was one provided. Nor did they migrate as the BB here appears to have done. But I agree that there there appears to be a lock ring in the package illustration. Maybe the OP can shed some light on whether the BB came with one
Again, no lock rings came with either of the BB sets, nor is there room to fit them. And fwiw, I used Campagnolo bottom brackets on other bikes with zero problems.
It looks like my options are to either spend more than I wish to for a TA Axix 107mm bottom bracket with an ISO taper that fits my current cranks, or to seek out a different crankset that accepts a more easily found JIS bottom bracket. Unless I find a shorter JIS BB that will yield the correct 42mm chainline.