CACycling

Anyone know if replacement parts are available for the Hollowtech II BBs? I've been opening them up to clean and regrease as needed and ended up breaking the plastic cover. Anyone know of a source for replacements? I'm running Ultegra but assume all the road BBs use the same part.

jimc101

They have "DO NOT DISASSEMBLE" printed on them for a reason, which you have found out.

Suggest you need to look at how you are maintaining your BB, as it does not need to be taken apart.

If you want to re-grease the bearings, you really need to b replacing them, with something like these https://www.enduroforkseals.com/id227.html

CACycling

Yes, so Shimano can sell more BBs. I have disassembled, cleaned, greased and reassembled these types of BBs several times without issue. Just wasn't careful enough this time. There's nothing magical inside, just bearings that can be cleaned and greased. Was hoping there might be a source for the part I need so I can keep this BB in service. If not, it will stay around for parts.

The link you provided is great but at $120 for the tool, I'll stick with cleaning and lubing the bearings Shimano has in there.

dedhed

Like this?
https://www.cambriabike.com/shopexd.asp?item=100012215

or this?
https://www.cambriabike.com/shopexd.asp?Item=100038453

pmt

Yeah, when you can buy both cups new on eBay for $10-$15, it's kind of hard to justify messing around with them much.

CACycling

Thanks but those are the complete assemblies. I was hoping the plastic cover would be available somewhere.

CACycling

It doesn't take much effort or time to clean and grease them and costs pennies. Just seems wasteful to me to toss something that still has a ton of life left in it.

HillRider

Try contacting Shimano America directly and see if the have the part available. Their phone number is on their web site under "contact us"

MudPie

I tend to agree that we tend to replace and dispose of items when they can be refurbished. I did enjoy the cup and cone days of wheel hubs and bottom brackets back in the day. It was a bit of an art just getting the proper pre-load on the bearings, and even more satisfying when you knew how to set the hubs with a tiny bit of play, and let the skewer action take up the slack.

On the other hand, I have over 11,500 miles on a wheelset without any indication of problems. I've never touched the bearings and they spin very smooth.


Oh well...that's progress, I guess.

dedhed

You can find the shimano part #'s here.

https://techdocs.shimano.com/media/te...9830621034.pdf

Good luck

saturnhr

Dear CaCycling, I think I found what you are looking for
see https://www.armitagebikeshop.com/Prod...st.aspx?k=6105
It seems that this plastic shell/sleeve comes in 2 different variants, you have to figure out which one it is (worse case order both) The direct Shimano approach suggested by hillrider with posted techdoc by dedhed seems not to be helpful, since it only lists the bearing cup as a whole (again following the Shimano "do not disassemble statement), which I - same as many other forum members- have repeatedly disobeyed. A $120 tool is also not needed - a set of various 1/2 and 3/4 drive sockets and a vise (and caution) have done the job for me. I normally don't regrease those bearings but rather replace them (supply is easily found in 10 packs from various bearing suppliers 25x37x7 for me).

CACycling

Thank you. That's exactly what I was looking for. I decided to go for a bearing replacement the next time (just ordered the bearings) instead of cleaning/greasing. We'll see how that goes.

Chris_W

Hope also makes HT II compatible BBs that are designed to be serviceable, they even have videos posted online showing you how to. I prefer to use these instead of the Shimano version.

CACycling

Thanks. I'll check those out as well.