71806 or 61806 bearings

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This topic has 12 replies, 6 voices, and was last updated 3 years ago by Kahurangi.

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71806 or 61806 bearings
wishiwascalledsteve
Full Member

Hi all, needs some new BB bearings for a Hope bottom bracket.
Hopes site says I need 71806 bearings, which are 30x42x7.
But 61806 are also 30x42x7 and they’re available in the SKF solid oil version, which could be a good idea for the BB.

So what’s the difference between the two and would they both work ok?
Ta

Posted 3 years ago

Onzadog
Free Member

Doesn’t the 7 indicate an angular contact bearing while the 6 indicates a deep groove bearing?

The only real difference would be how much preload you apply.

Posted 3 years ago

wishiwascalledsteve
Full Member

Thanks for the reply, so it will fit and work, but a different type of bearing!?

Am I right in thinking, that as long as I don’t overdo the preload the 61806 bearing will be fine?

Thanks

Posted 3 years ago

Onzadog
Free Member

6 series deep groove bearings have been used on bottom bracket for years without issue. Hope’s own advice at one point was that a really tiny bit if play is better than too much preload.

Posted 3 years ago

wishiwascalledsteve
Full Member

Cool, thanks for the help

Posted 3 years ago

paton
Free Member

https://www.hambini.com/technical-support/bearing-technical-information/

Posted 3 years ago

DickBarton
Full Member

Solid oil – as in grease?

Posted 3 years ago

matt_outandabout
Full Member

I would like to try out the Cane Creek / SKF solid bearings – anyone running them?

Posted 3 years ago

Kahurangi
Full Member

Hope’s own advice at one point was that a really tiny bit if play is better than too much preload

That’s what I would have suggested if you were going to try the deep groove instead of angular contact bearings.

n.b. 71806 in stock here

https://simplybearings.co.uk/shop/advanced_search_result.php?search_in_description=1&keywords=71806

Posted 3 years ago

wishiwascalledsteve
Full Member

Just ordered two, had to pay over the odds for UK stock as none of the German sites, which were a tenner cheaper per bearing, are shipping to UK.

Look promising though.

https://www.skf-mtrx.de/en

Instead of grease, the bearing have a more solid plastic/polymer taking up the dead space. Theory is there’s no grease to wash out and no space for water to collect.

Posted 3 years ago

wishiwascalledsteve
Full Member

Thanks for all the replies, wanted to try the SKF ones as had a couple of sets of 71806 become rough quite quickly.

Posted 3 years ago

DickBarton
Full Member

Ah, that makes sense…thanks.

Posted 3 years ago

Kahurangi
Full Member

Good luck and make sure to report back in 6 or 12 months!

Posted 3 years ago