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Shimano Ultegra BB Impossible bearings?
Posted: 22 Aug 2021, 3:38pm
by fausto99
Idle curiousity really, but AFAICS, the bearings in a SM-BBR60 seem to be 35od x 25id x 6mm roller ball bearings. Looking on the Simply Bearings site, if you put in 25mm id, then the only choice of od is 32 or 37mm. So the question is, do Shimano use unobtainium non-standard bearings?!?
Re: Shimano Ultegra BB Impossible bearings?
Posted: 22 Aug 2021, 4:06pm
by robgul
Firstly, Shimano don't want you taking the BB apart! If the bearings have had it you buy a new BB
Are you sure on the size? - there is probably an embossed code on the plastic bearing seal - that would help to identify it.
Kinetic is my bearing supplier of choice :
https://www.kineticbikebearings.com (usually a lot cheaper than Simply Bearings - and more knowledgeable on bike bearings)
Re: Shimano Ultegra BB Impossible bearings?
Posted: 22 Aug 2021, 5:58pm
by cycle tramp
robgul wrote: ↑22 Aug 2021, 4:06pm
Firstly, Shimano don't want you taking the BB apart! If the bearings have had it you buy a new BB
Are you sure on the size? - there is probably an embossed code on the plastic bearing seal - that would help to identify it.
Kinetic is my bearing supplier of choice :
https://www.kineticbikebearings.com (usually a lot cheaper than Simply Bearings - and more knowledgeable on bike bearings)
Thanks for the link - what an amazing site
Re: Shimano Ultegra BB Impossible bearings?
Posted: 22 Aug 2021, 8:52pm
by Pneumant
fausto99 wrote: ↑22 Aug 2021, 3:38pm
Idle curiousity really, but AFAICS, the bearings in a SM-BBR60 seem to be 35od x 25id x 6mm roller ball bearings. Looking on the Simply Bearings site, if you put in 25mm id, then the only choice of od is 32 or 37mm. So the question is, do Shimano use unobtainium non-standard bearings?!?
Check out Brucey's post >>
viewtopic.php?f=5&t=144219&p=1582240&hi ... t#p1582240
Re: Shimano Ultegra BB Impossible bearings?
Posted: 23 Aug 2021, 11:36am
by fausto99
Pneumant wrote: ↑22 Aug 2021, 8:52pm
fausto99 wrote: ↑22 Aug 2021, 3:38pm
Idle curiousity really, but AFAICS, the bearings in a SM-BBR60 seem to be 35od x 25id x 6mm roller ball bearings. Looking on the Simply Bearings site, if you put in 25mm id, then the only choice of od is 32 or 37mm. So the question is, do Shimano use unobtainium non-standard bearings?!?
Check out Brucey's post >>
viewtopic.php?f=5&t=144219&p=1582240&hi ... t#p1582240
Thanks for the link. Looks like a good fallback plan.
Re: Shimano Ultegra BB Impossible bearings?
Posted: 23 Aug 2021, 1:13pm
by Jamesh
I do miss brucey posts....
Cheers James
Re: Shimano Ultegra BB Impossible bearings?
Posted: 23 Aug 2021, 7:56pm
by Pneumant
Jamesh wrote: ↑23 Aug 2021, 1:13pm
I do miss brucey posts....
Cheers James
I too miss reading Brucey's excellent posts,
Re: Shimano Ultegra BB Impossible bearings?
Posted: 23 Aug 2021, 9:49pm
by gxaustin
+1 to that. Many people miss Brucey
Re: Shimano Ultegra BB Impossible bearings?
Posted: 23 Aug 2021, 10:26pm
by fausto99