The C64 in all its resplendent lugged gloryJack Luke / Immediate Media
First introduced with the C60, ThreadFit 82.5 is essentially a replaceable thread-in sleeve that accepts any BB86.5 press-fit bottom bracket.
The updated ThreadFit 82.8 bottom bracket uses the same shell as before, but cuts out the middleman — the thread-in sleeve that accepts a press-fit bottom bracket — and is best thought of as a scaled-up version of a regular threaded bottom bracket.
It’s not very clear from the picture, but there is a threaded alloy sleeve bonded into either side of the shellJack Luke / Immediate Media
It’s not very clear from these pictures, but an alloy sleeve is bonded into either side of the bottom-bracket shell, rather than threading directly into carbon, which would be insane.
Colnago claims this will bring all the benefits that a larger shell and axle offer without the potential faff of a press-fit interface anywhere in the system. The new bottom bracket is also compatible with other Colnago bikes that use the ThreadFit 82.5 system.
The cynic in me can’t help but wonder why Colnago didn’t adopt the pre-existing — though admittedly not that widely adopted — T47 bottom bracket standard here, but I digress.