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PostPosted: Sun Jul 19, 2009 12:51 am 
Old School Grand Master
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Joined: Wed Mar 19, 2008 7:18 pm
Posts: 3186
Location: NFA
no go try it...


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 Post subject:
PostPosted: Sun Jul 19, 2009 1:19 am 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider
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Joined: Sun May 25, 2008 11:03 am
Posts: 19034
Location: Sunny Glasgow
:oops:
Threw the spanner of confusion into the workings there.


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 Post subject:
PostPosted: Sun Jul 19, 2009 1:29 am 
Dirt Disciple

Joined: Mon Jul 13, 2009 11:23 pm
Posts: 62
i know what your saying, my brain just doesnt work like that, i can see past that.

i think the simplest way to remember is this

you dont want the bb to come undone so pedaling [forward] tightens it up.


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PostPosted: Sun Jul 19, 2009 12:27 pm 
Retro Guru
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Joined: Thu Aug 23, 2007 9:19 pm
Posts: 1577
Location: Europa
currie wrote:
i think the simplest way to remember is this

you dont want the bb to come undone so pedaling [forward] tightens it up.


Nope.
There's no such thing as a "standard" BB, but on the "English thread" type (which you PROBABLY have) BOTH BB cups LOOSEN when turned towards the FRONT of the bike.

- Precisely because you DO want them to undo in the pedalling direction.
I *THINK* Sheldon says this is some kind of throwback to fixed gear drivetrains, where:

If the BB seizes up, the rotation is likely to break your ankles. So the BB is set to unwind in that direction. Under normal riding, this doesn't happen, because there's more friction in the BB cup/ frame interface than in the pedal and BB bearings.

Presumably this would only EVER work on a clean & well-lubricated track bike? My mud-encrusted BB cups always need a bit of grunt to remove them & would never smoothly unwind from the frame if the bearings suddenly seized up.


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 Post subject:
PostPosted: Sun Jul 19, 2009 6:00 pm 
Old School Grand Master
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Joined: Wed Mar 19, 2008 7:18 pm
Posts: 3186
Location: NFA
Lol but when at the bottom turning the spanner past 3,4,5,6 o clock Im going towards the back of the bike...!!!! lol


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PostPosted: Sun Jul 19, 2009 6:34 pm 
Retro Guru
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Joined: Wed Apr 23, 2008 9:57 pm
Posts: 2437
Location: Kent UK
fingers wrote:
Lol but when at the bottom turning the spanner past 3,4,5,6 o clock Im going towards the back of the bike...!!!! lol


I was meaning when the bike was the right way up! :lol:

Some of us here, who haven't spent all their money on retro stuff, have these new-fangled workstand things. :P :lol: :lol: :lol:


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 Post subject:
PostPosted: Sun Jul 19, 2009 6:38 pm 
Old School Grand Master
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Joined: Wed Mar 19, 2008 7:18 pm
Posts: 3186
Location: NFA
I remember by -

RH pedal, RH thread, LH pedal LH thread, BB the other way round.

Simple.

And I spend most of my money on wine and crisps :wink:


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