bottom bracket
02-27-22, 10:05 AM
#1
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bottom bracket
Can someone tell me what this plastic part with the arrow and "+" sign is for on this bottom bracket?
02-27-22, 10:14 AM
#3
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Yes, it is an eccentric - but I'm not sure what that plastic part is for. Do you happen to know who makes it? I'd like to find a spec sheet or other written information about it.
edit: too bad about comment below. the bike is a tandem and it is an eccentric, of course.
edit: too bad about comment below. the bike is a tandem and it is an eccentric, of course.
Last edited by BNB; 02-27-22 at 04:00 PM.
02-27-22, 01:10 PM
#4
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I believe it’s for bearing preload
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02-27-22, 01:14 PM
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This is correct.
https://www.parktool.com/blog/repair...g-preload-ring
https://www.parktool.com/blog/repair...g-preload-ring
02-27-22, 02:45 PM
#6
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Thanks! So doesn't matter that it's floating; not touching on either side.
02-27-22, 03:08 PM
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As long as the bearing preload is correct and if dependent on the adjuster and if the adjuster doesn't move about all is fine. Somehow I doubt all these aspects are in agreement if the preload ring isn't contacting anything WRT the bearings. Andy
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AndrewRStewart
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02-27-22, 03:10 PM
#8
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You'll likely have some lateral play in the crank. Watch the video above to properly adjust it.
02-27-22, 03:32 PM
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Correct.
C'mon guys, if you don't know don't comment. And of course...RTFM.
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02-27-22, 05:54 PM
#11
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Thanks for this video; I've never worked with this before. Been assembling my new tandem all day so this was reassuring and I will adjust as video says.
This is correct.
https://www.parktool.com/blog/repair...g-preload-ring
https://www.parktool.com/blog/repair...g-preload-ring
