There are now several different crank bearing systems and standards. The different standards do not allow interchangeability between bearings or cranksets. Having some knowledge of the standard will help the mechanic be aware of service options.
Threaded Bottom Bracket Shells
The PF30 system uses an unthreaded frame shell with an inside diameter of nominally 46mm. The inside of the shell is a straight bore, without the stops or clips of the BB30 standard. The shell widths are 68mm for road bikes and 73mm for mountain bikes.
PF30 frame shell
The "Shimano press fit" standard is a bottom bracket system that does not use internal threading. Unfortunately there is no industry wide agreed upon name for this standard. The Shimano Company's name for the system is "Shimano Press Fit". The colloquial titles BB86, BB90 or BB92 refer to the no...
This article will review the service of the Campagnolo® Power-Torque™ crank system.
This article will discuss the service of adjusting bottom bracket bearings. It will also review the types of tools required. The basic concept for bearing adjustments is to get the bearings adjusted as loose as possible but without play. This can be done by purposely beginning with play in the ad...
This article will discuss the removal and installation of the common cartridge bottom brackets of the three-piece cranksets.
This article will discuss tool selection for servicing bottom brackets. Many bottom brackets require special tools for installation and removal. A table summarizing tool section is at end of this article.
This article will discuss service of external bearing cranks systems.
This article will review the bearing service of the Campagnolo and Fulcrum Ultra Torque cranksets.
This article will discuss use of the Park Tool BTS-1 and the Park Tool BFS-1.
This article will discuss the removal and installation of the BB30 cartridge bottom bracket bearings.
This article will discuss service on one-piece crank bottom bracket bearings("Ashtabula").It will also discuss pressing the three-piece cartridge bearings into the Ashtabula bottom bracket shell.
This article will discuss trouble shooting noisy drive trains. Creaking and squeaking noises are annoying, and can be a sign of more serious problems. Damage to component parts may result if they are left unattended.