Bottom bracket gunk
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Bottom bracket gunk
Postby BugsBunny » Tue Jun 05, 2018 4:43 pm
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Re: Bottom bracket gunk
Postby 10speedsemiracer » Tue Jun 05, 2018 4:58 pm
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Re: Bottom bracket gunk
Postby HenryCharlie » Thu Jun 07, 2018 1:26 pm
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Re: Bottom bracket gunk
Postby BugsBunny » Thu Jun 07, 2018 5:21 pm
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Re: Bottom bracket gunk
Postby macca33 » Thu Jun 07, 2018 7:21 pm
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Re: Bottom bracket gunk
Postby Tim » Thu Jun 07, 2018 8:06 pm
I reckon that is mostly rust rather than dirt embedded in emulsified (water spoiled) bearing grease.
A fine example of very poorly sealed press-fit "sealed" cartridge bearings.
I get more than ten times that mileage from bottom brackets. I don't clean my bikes with water, particularly a hose and no detergents or degreasers. Occasional wet weather, many more than 5 days.
The older style square taper type, properly sealed BB's are known to last well over 50,000km's.
Bike's are chit these days. Not designed to last. But they do go fast and I do like them. Old and new.
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Re: Bottom bracket gunk
Postby 10speedsemiracer » Thu Jun 07, 2018 8:18 pm
I'm with Tim on this, in that I regard modern bikes as appliances as opposed to older bikes being a more classical, diverse expression of design and function.Tim wrote:......
Bike's are chit these days. Not designed to last. But they do go fast and I do like them. Old and new.
I like some features of modern bikes (aside from anything involving press-fit) and appreciate modern drivelines especially, but a 70s or 80s high-end bike will always do more for me than the current generic stuff.
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Re: Bottom bracket gunk
Postby Duck! » Thu Jun 07, 2018 8:50 pm
The real culprit here is the direct contact between the aluminium crank spindle and the steel bearing shells. Other elements accelerate it, but the underlying issue is the fundamentally reactive relationship between the two different metals. Short version: bad design.Tim wrote:Do you wash the bike with a hose or Gerni type cleaner? Water and detergents or degreasers?
I reckon that is mostly rust rather than dirt embedded in emulsified (water spoiled) bearing grease.
A fine example of very poorly sealed press-fit "sealed" cartridge bearings.
I get more than ten times that mileage from bottom brackets. I don't clean my bikes with water, particularly a hose and no detergents or degreasers. Occasional wet weather, many more than 5 days.
The older style square taper type, properly sealed BB's are known to last well over 50,000km's.
Bike's are chit these days. Not designed to last. But they do go fast and I do like them. Old and new.
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Re: Bottom bracket gunk
Postby BugsBunny » Fri Jun 08, 2018 1:57 pm
After a full strip and rebuild, I needed a new BB and three of the 4 rear bearings needed replacing. And these are all less than a year old.
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Re: Bottom bracket gunk
Postby stevebni » Thu Jun 14, 2018 9:59 am
If you want to see some real gunk, check out my workshops Insta feed: https://www.instagram.com/bikespannerni/
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Re: Bottom bracket gunk
Postby 10speedsemiracer » Thu Jun 14, 2018 10:06 am
Just had a scroll, am now traumatized. The Vinnie meme summed it up well.stevebni wrote:Amongst other things, I've been a bike mechanic for over thirty years, that's really not a lot of gunk. I'd say it's pretty clean really, given how much gunk most modern bikes let in. Most get's in via the seat tube.
If you want to see some real gunk, check out my workshops Insta feed: https://www.instagram.com/bikespannerni/
It's been emotional
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Re: Bottom bracket gunk
Postby stevebni » Thu Jun 14, 2018 11:40 am
You do need to bear in mind we're in Ireland (I'm in Aus at the mo, but I live in, and the workshop is in, Ireland). Bit wetter there than here!
Seized BB's with collapsed bearings is a pretty common occurrence. We have a range of hammers to deal with them
The Vinnie meme was from the time I closed my bike shop to transition to a workshop only business.
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