My bike has recently developed creaking noises from the bottom bracket area so I decided to take everything apart, give it a good clean, apply some lube and reassemble.
What turned out to live inside the bottom bracket shell was BB-UN100 with plastic cups which I promptly ruined on reassembly. So I am looking for something more sturdy and preferably not made of plasticine.
The spec for my bike shows that it normally comes with BB-UN26, mine for whatever reason did not, but from the picture it seems that at least one cup it comes with is made of plastic.
BB-UN100 has the following etched on it:
- BC 1.37x24
- LL123 BC 68
I gather that 68 refers to the shell width, which is 68mm indeed, 123 to the axle length which a quick glance at a vernier caliper confirmed to be 123mm, and the thread type is English. No idea what LL signifies. I came across some manual that said it is a code for 113mm spindle length, so I'm a bit confused.
BB-UN55 looks like what I want and is available in 68 122.5mm size. Will it fit? The fact that they bother to specify the axle length to a tenth of a millimetre (the only length like that) makes me nervous.
Otherwise what other options do I have?