Join Date: Oct 2005
Location: st. louis
Bikes: God knows what old Raleigh, Specialized e5 road bike
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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.