Hollowtech Bottom Bracket Sleeve
Hollowtech Bottom Bracket Sleeve
I was assembling a Hollowtech bottom bracket on a new frame earlier today. The bb is supplied with a sleeve that should fit in the shell, but it doesn't because the screw for the cable guide under the bb shell protudes too far.
Does it matter that I have assembled it without the sleeve?
Does it matter that I have assembled it without the sleeve?
Richard M
Cardiff
Cardiff
Re: Hollowtech Bottom Bracket Sleeve
Which model, please?
Jonathan
Jonathan
Re: Hollowtech Bottom Bracket Sleeve
It says BB-RS500 on it. This one I think https://www.amazon.co.uk/SHIMANO-BB-RS5 ... B07NYV28VL
Richard M
Cardiff
Cardiff
Re: Hollowtech Bottom Bracket Sleeve
Doesn’t matter to me as I’ve fitted them without a sleeve. If you were really bothered you could have cut the protruding end of the screw off.
I think they’re just there to stop internal water and dirt if you have a frame with insides like that.
I think they’re just there to stop internal water and dirt if you have a frame with insides like that.
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Re: Hollowtech Bottom Bracket Sleeve
It did occur to me that I could remove the screw and replace it with a shorter one, or cut it, but then I thought that not having the sleeve probably won't cause any problems.
Last edited by richardfm on 5 Dec 2021, 9:40pm, edited 1 time in total.
Richard M
Cardiff
Cardiff
Re: Hollowtech Bottom Bracket Sleeve
Shimano's instructions:
• If the frame has openings inside the bottom bracket shell, it should be installed with the inner cover sleeve to prevent possible contamination.
• If the frame has no openings inside the bottom bracket shell, it can be installed without the inner cover sleeve.
https://si.shimano.com/api/publish/stor ... 01-ENG.pdf
Jonathan
• If the frame has openings inside the bottom bracket shell, it should be installed with the inner cover sleeve to prevent possible contamination.
• If the frame has no openings inside the bottom bracket shell, it can be installed without the inner cover sleeve.
https://si.shimano.com/api/publish/stor ... 01-ENG.pdf
Jonathan
Re: Hollowtech Bottom Bracket Sleeve
May be I should find a shorter screw or shorten the existing one.Jdsk wrote: ↑5 Dec 2021, 9:31pm Shimano's instructions:
• If the frame has openings inside the bottom bracket shell, it should be installed with the inner cover sleeve to prevent possible contamination.
• If the frame has no openings inside the bottom bracket shell, it can be installed without the inner cover sleeve.
https://si.shimano.com/api/publish/stor ... 01-ENG.pdf
Jonathan
Richard M
Cardiff
Cardiff
Re: Hollowtech Bottom Bracket Sleeve
That's what I'd do regardless... but are there any (other) openings?richardfm wrote: ↑5 Dec 2021, 9:42pmMay be I should find a shorter screw or shorten the existing one.Jdsk wrote: ↑5 Dec 2021, 9:31pm Shimano's instructions:
• If the frame has openings inside the bottom bracket shell, it should be installed with the inner cover sleeve to prevent possible contamination.
• If the frame has no openings inside the bottom bracket shell, it can be installed without the inner cover sleeve.
https://si.shimano.com/api/publish/stor ... 01-ENG.pdf
Jonathan
Re: Hollowtech Bottom Bracket Sleeve
Good question...I assumed there would be where the seat tube and down tube meet the bb shell, I'll have to dissassemble it to check...and while I'm doing that I may as well sort the screw out.Jdsk wrote: ↑5 Dec 2021, 9:46pmThat's what I'd do regardless... but are there any (other) openings?richardfm wrote: ↑5 Dec 2021, 9:42pmMay be I should find a shorter screw or shorten the existing one.Jdsk wrote: ↑5 Dec 2021, 9:31pm Shimano's instructions:
• If the frame has openings inside the bottom bracket shell, it should be installed with the inner cover sleeve to prevent possible contamination.
• If the frame has no openings inside the bottom bracket shell, it can be installed without the inner cover sleeve.
https://si.shimano.com/api/publish/stor ... 01-ENG.pdf
Jonathan
Richard M
Cardiff
Cardiff
Re: Hollowtech Bottom Bracket Sleeve
I've used the shortest screw I had and a presta valve nut as a spacer for the screw.
Re: Hollowtech Bottom Bracket Sleeve
Cut a slot in the sleeve to accomodate the screw?I once kept a cable guide in place with bathroom mastic,stayed there for years.
Re: Hollowtech Bottom Bracket Sleeve
I did think about cutting a slot but that would harm the integrity of the sleeve and defeat the point of having it.
Richard M
Cardiff
Cardiff
Re: Hollowtech Bottom Bracket Sleeve
Yes,I get that.If the sleeve is plastic,can you drill a hole,6mm or so to accomodate the screw then work the sleeve over and into the bb.Or cut the slot,install and fill the slot with mastic,silicon.Messy,yes.Shorten the screw.Brilliant idea Take the screw out,install the sleeve,sharpen the screw,refit the screw which will pierce the plastic and form a snug fit around the screw.(or drill a pilot hole taking care not to damage the threads in the bb)
Re: Hollowtech Bottom Bracket Sleeve
Remove the screw, clean the guide and bottom bracket and replace the guide using double-sided tape or epoxy to hold it in place.
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Re: Hollowtech Bottom Bracket Sleeve
I'd use a shorter screw or shorten this one.
If you're not familiar with doing this: run a nut up the thread first, cut to length, then run the nut back and off to reform the end in case it was damaged during cutting.
Jonathan
If you're not familiar with doing this: run a nut up the thread first, cut to length, then run the nut back and off to reform the end in case it was damaged during cutting.
Jonathan