cartridge bottom bracket design
10-31-05, 10:27 AM
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cartridge bottom bracket design
I just bought a Shimano cartridge bottom bracket, model UN 53 I believe. Pretty straightforward install, but I was surprised to note that only the right side screws into the bottom bracket shell. I got this plastic ring on the left side to fix that side of the bottom bracket, and that just seems silly. I can't see how the left side can be adequately supported when you're really hammering the cranks.
I want a bottom bracket that is equally supported on both sides of the shell. What bottom bracket can provide this? If this is a non-issue I'd sure like to know why I'm an alarmist so I can get on with the build, but having all the load borne on the right side of the shell (I can't acknowledge how a plastic sleeve, no matter how well it presses into the cartridge end, supports as well as metal to metal) just can't be good.
I want a bottom bracket that is equally supported on both sides of the shell. What bottom bracket can provide this? If this is a non-issue I'd sure like to know why I'm an alarmist so I can get on with the build, but having all the load borne on the right side of the shell (I can't acknowledge how a plastic sleeve, no matter how well it presses into the cartridge end, supports as well as metal to metal) just can't be good.
10-31-05, 11:40 AM
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It's fine, don't worry about it!!!
10-31-05, 11:49 AM
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The plastic sleeve does a fine job of supporting the non-drive side of the bottom bracket. Find something else to worry about. 
BTW, if you remove the bb for a service check (you can't actually service the bb itself), remove the drive side first. The plastic sleeve will tend to break if you remove it first and the broken parts are a pain to get out of the bb shell.
BTW, if you remove the bb for a service check (you can't actually service the bb itself), remove the drive side first. The plastic sleeve will tend to break if you remove it first and the broken parts are a pain to get out of the bb shell.
10-31-05, 01:23 PM
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Originally Posted by HillRider
The plastic sleeve does a fine job of supporting the non-drive side of the bottom bracket. Find something else to worry about.
BTW, if you remove the bb for a service check (you can't actually service the bb itself), remove the drive side first. The plastic sleeve will tend to break if you remove it first and the broken parts are a pain to get out of the bb shell.
BTW, if you remove the bb for a service check (you can't actually service the bb itself), remove the drive side first. The plastic sleeve will tend to break if you remove it first and the broken parts are a pain to get out of the bb shell.
