Bicycle Mechanics - clarification on crank/BB terminology
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08-03-07, 11:31 AM
I think i have a general idea, but can someone more knowlegeable than I explain these a little and the differences between them:
cartridge bottom bracket?
integrated bottom bracket?
i'm trying to buy some park tools and just want to make sure i understand completely what i actaully have.
08-03-07, 11:53 AM
I can tell you about a couple of them.
Square taper is the "old school" type where the spindle is a tapered square shape and the crank arms are press fit onto the taper with a bolt. Works very well, but you need an extractor tool to get the crank arm off and many people ****** the threads on the crank arm, making removal difficult, but not impossible.
Cartridge BB is sealed bearing assembly that threads into the existing BB that had ball bearings. They last a long time and have no maintenance.
08-03-07, 12:52 PM
OK here goes.
Hollowtech II? Shimano version of the external bearing type crankset
I.S.I.S? Consists of a splined BB axle to crank arm connection.
Octalink? Shimano version of a splined BB axle to crank arm connection. Splines are a different pattern than ISIS
cartridge bottom bracket? A sealed bearing BB where the bearings and axle are installed as a unit
integrated bottom bracket? Not sure but I assume this refers to BBs like Klein used to use where the BB is pressed in and is a PIA to ever change
external bearings? Newer style BB where the bearings install first and on the outside of the BB shell and the axle slides through the bearings to install
square taper? Old school BB axle to crank arm connection using a square tapered axle. Still works really well BTW
See Sheldon's bike glossary (http://www.sheldonbrown.com/gloss_sp-ss.html) :
See Sheldon's bike glossary (http://www.sheldonbrown.com/gloss_sp-ss.html)
Also Articles (http://sheldonbrown.com/articles.html).
08-31-07, 11:42 AM
those pics are a lifesaver
good info thanks a lot....
From sheldon brown and google images.
Hollowtech II/integrated bottom bracket/external bearings
"The two-piece crank /bottom bracket system introduced with the 2004 10-speed Dura-Ace line. These use external bearings that hang outboard from the bottom bracket shell."
(International Spline Interface Standard)
"When Shimano introduced its proprietary Octalink splined bottom bracket system, a group of other manufacturers got together to produce their own competitive splined system. This became ISIS. ISIS cranks and bottom brackets only work with each other, as do other splined systems. "
cartridge bottom bracket
"Bearings which are assembled in a modular unit, as opposed to cup-and-cone bearings, which may be disassembled down to the individual bearing balls for service.
Cartridge bearings are the only type of ball bearings used in most industrial products; bicycle technology is the major area where cup-and-cone bearings still survive, but they are in decline even in the bicycle industry. ******* A conventional cup-and-cone bottom bracket.
The lock ring wrench is about to loosen the lockring, the pin wrench is engaging two of the holes in the adjustable cup http://sheldonbrown.com/images/bottom_brackets300-222.gif A cartridge bottom bracket. The splined tool is shown above the bottom bracket. The crank would need to be removed to actually use the tool. "
03-24-08, 01:30 PM
Good info in the previous posts, except for Hollowtech II, which really refers to Shimano's design of the cranks themselves and has nothing to do with the type of BB/bearing assembly. As the name implies, the arms are formed with a hollow cavity inside. Per Shimano, this makes them stiffer (because the structure of the arms are essentially an irregular shaped tube), and lighter (because the arm is hollow). The Hollowtech crankarms were introduced before the outboard bearing BB became popular, so you can find cranksets that have the Hollowtech arms but use the Octalink spindle/BB.
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