Bottom bracket

[Old biker]

I have Shimano BB -UN72 mm110. I’m sure it’s British thread. What is a compatible shimano part number.

[Painkiller]

bb-un55 is a suitable replacement, you opted out of any info in your bio as to approx. location so the help kinda stops there. but Cambria bikes has it for around $16.00us +shipping. That is a great price

[Old biker]

To many numbers on BB’s. When I search un55 I get un300. However non say 72 and 110. There must be some variance or range to stay in.

[Painkiller]

(08-17-2024, 07:14 PM)Old biker Wrote:  To many numbers on BB’s. When I search un55 I get un300. However non say 72 and 110. There must be some variance or range to stay in.

that would be fine if thats all available to you. all you need to know is shell width 68,73 and spindle length you want i.e. 110

[ReapThaWhirlwind]

The BB300 is the newest version of the sealed cartridge I believe.

As the numbers go up, they are improved (higher quality) versions of the lower numbers.

They will all work the same as suggested. You just need to match threads (BSA/ITA), the shell width, and spindle size for your bike and crank.

[Talha]

Shimano BB-UN300
part number BB-UN300-110, the 110 is 110mm spindle length