Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-17-04, 05:23 PM   #1
velo
The Female Enduro
Thread Starter
 
velo's Avatar
 
Join Date: Apr 2000
Location: Pennsylvania, United States of America
Bikes:
Posts: 1,185
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What's a splined bottom bracket? cartridge style?

So, what's this bottom bracket lingo? What does it mean when they say a bottom bracket is splined? What is it if it isn't splined? What's cartridge style mean? What is it if it isn't cartridge style?

Thanks,
velo
velo is offline   Reply With Quote
Old 02-17-04, 05:40 PM   #2
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,739
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 141 Post(s)
Most older cranks (and some new ones) have a square hole where they slide onto the square bottom bracket spindle. Splined bottom brackets, insted of being square, have a star shaped spindle like a gear. The crank arms have to have a star shaped hole that matches perfectly.

Older bottom brackets (and some new ones) have several pieces and serviceable ball bearings. Cartridge bottom brackets have only two pieces - a cartridge which includes the bearings and spindle, and a bushing which just keeps the left side of the bottom bracket from rocking. Decent quality cartridge bottom brackets tend to be relatively trouble free, but they aren't serviceable so when they go bad you have to replace the whole enchalida.
Retro Grouch is offline   Reply With Quote
Old 02-18-04, 05:37 AM   #3
Richard D
Donating member
 
Richard D's Avatar
 
Join Date: Sep 2001
Location: Faversham, Kent, UK
Bikes:
Posts: 1,852
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Note that there is more than one type of splined BB - Shimano (Octalink) and Isis are the most common and aren't compatible. In theory a splined spindle gives a better contact making the cranks feel 'stiffer'. To be honest I couldn't detect the difference in use...
__________________
Currently riding an MTB with a split personality - commuting, touring, riding for the sake of riding, on or off road :)
Richard D is offline   Reply With Quote
Old 02-18-04, 06:17 PM   #4
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Bikes:
Posts: 3,040
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Splined BB have a larger diameter than Square taper
BB axles. Splined are hollow and hence a bit lighter, but since they are larger in diameter they are stiffer. As
Richard implies, sub pro level cyclists will never notice.
There are several different Square taper standards:
Campy's taper is slightly different from Shimano which
is different from TA. For the most part this is not a deal breaker and mixing BB axles and cranks will work. However ISIS is totally incompatible with Shimano, as
Shimano refused to license the Octalink. ISIS was mostly ATB but has filtered into a few high zoot road sets. Steve
sch is offline   Reply With Quote
Old 02-19-04, 09:52 AM   #5
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity
Posts: 15,061
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by sch
. As
Richard implies, sub pro level cyclists will never notice.
.
Not true I made the switch and I can DEFINITELY tell.
__________________
Raiyn is offline   Reply With Quote
Old 02-19-04, 06:18 PM   #6
sch
Senior Member
 
Join Date: May 2003
Location: Mountain Brook. AL
Bikes:
Posts: 3,040
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Quote:
Originally Posted by Raiyn
Not true I made the switch and I can DEFINITELY tell.
Well there are always the outliers and those with golden legs..... : )
Those of us who are more torque challenged will not. Steve
sch is offline   Reply With Quote
Old 02-19-04, 06:27 PM   #7
khuon
DEADBEEF
 
khuon's Avatar
 
Join Date: Aug 2002
Location: Catching his breath alongside a road near Seattle, WA USA
Bikes: 1999 K2 OzM, 2001 Aegis Aro Svelte
Posts: 12,242
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by sch
There are several different Square taper standards:
Campy's taper is slightly different from Shimano which
is different from TA. For the most part this is not a deal breaker and mixing BB axles and cranks will work. However ISIS is totally incompatible with Shimano, as
Shimano refused to license the Octalink. ISIS was mostly ATB but has filtered into a few high zoot road sets.
Actually I believe Shimano will license Octalink... I have an Octalink compatible crank mated to a Dura-Ace BB on my roadbike. The same crank is also available in ISIS format. The thing with ISIS is that it's an open standard and free whereas you have to pay for Shimano's license.

Also note that there are also different versions of Octalink which are incompatible with one another. And then to add to the confusion there's other types of crank-BB interfaces coming out now including the new Dura-Ace integrated BB patterned after the XTR system from last year which itself was an idea "borrowed" from Bullseye of old. Race Face has introduced a similar system called X-Drive.
__________________
1999 K2 OzM 2001 Aegis Aro Svelte
"Be liberal in what you accept, and conservative in what you send." -- Jon Postel, RFC1122
khuon is offline   Reply With Quote
Old 02-19-04, 07:05 PM   #8
Dutchy
We drive on the left.
 
Dutchy's Avatar
 
Join Date: Sep 2001
Location: Adelaide, South Australia
Bikes:
Posts: 1,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I can't tell the difference

I ride two bikes, one with the old style square BB and one with the new Octalink type, and can not tell the difference. Just another marketing gimmick to grab our cash.

CHEERS.

Mark
Dutchy is offline   Reply With Quote
Old 02-19-04, 09:59 PM   #9
d_D
645f44
 
d_D's Avatar
 
Join Date: Sep 2003
Location: Oxford, Uk
Bikes:
Posts: 482
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Dutchy
I ride two bikes, one with the old style square BB and one with the new Octalink type, and can not tell the difference. Just another marketing gimmick to grab our cash.
There is a use and a requirement for splined cranks as anyone who has rounded a square taper hole or broken an arm will tell you. Doesn't stop the marketing department from trying to market them to people that are better off with square taper though.

I go through isis bbs at least twice as fast as the cheap shimano square taper bbs. With the current bb shell diameter and big spindle there isn't enough space left for bearings with a decent life.
Until the diameter of the bb shell is increased I don't think splined bbs have a place on bikes that arn't having problems with square taper.

I can't feel the differnce between them either.
d_D is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 12:03 AM.