Press fit bottom bracket frame shells use a simple bore with no internal threading. There were cups in the bearings into which loose ball bearings fitted, with the axles having a curved surface which pushed against the ball bearings. This spec can also show up on old Motobecanes. So, for example, you can get adapters which let you run a 24mm crank spindle in a BB30 frame, and which take care of the extra axle length too. You should be able to screw in the cups by hand. The bottom bracket shell width is 87mm, while the 46mm shell diameter means that it will accept PF30 bearings. Also see our article about cartridge-bearing bottom brackets.
The use of the product should not go beyond the verification of its new condition and functioning upon receipt. Shell is slightly larger, thread pitch slightly finer. Phil Wood cartridge-bearing mounting cups are made for every type of bottom-bracket threading. The cup has a right threading, so it tightens as most threaded objects do, by turning clockwise. We sell an extensive range of bottom brackets so not surprisingly we get lots of questions.
So all of the main standards available have their downsides, as well as their advantages. Unfortunately, the industry has not been clear and consistent when creating terms and names for them, sometimes creating several names for the same bottom bracket standard. This article will review the many bottom bracket standards on bicycles. This standard also goes by other names, but they all mean the same thing. Colnago says that its design improves rigidity, reliability and ease of maintenance.