Substituting the "symmetrical equivalent" bottom bracket will preserve the position of the right crank and chainwheel, but the left side will often wind up farther out. These spindles are getting harder and harder to find. In many cases, it makes more sense to upgrade to an inexpensive modern cartridge bottom bracket.
Dec 16, 2014 · Bottom bracket service falls into one of two categories: you either change them with a new one or exchange bearings. Older square tapered bottom brackets with loose ball bearings were full service, but nowadays that’s rare. You could (if you’re careful) repack a non-sealed cartridge (external BB Author: Syd Patricio.
Dec 01, 2010 · i have an old Shimano cartridge bottom bracket, BB - LP27 that is getting moved to my bike that gets the crappy parts. the spindle turns quite sluggishly and looking closer it doesn't appear to be sealed, so i thought i could rebuild it but it does look like i might need to buy a couple of wrenches to open it up. the lock ring is easy to get at and looks to be around 21mm but the larger ring.
Aug 21, 2015 · Bottom Bracket Service: BB90, BB86, BB92, GXP® Press Fit. This article will review the service of the SRAM® PressFit GXP® and "Shimano® Press-Fit" threadless bottom bracket standards. These systems use a two-piece crank with a nominally 24mm diameter spindle.