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PostPosted: Mon Mar 05, 2007 8:51 pm 
Old School Hero
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Joined: Mon Jun 26, 2006 6:11 am
Posts: 173
Location: USA
Howdy all,
Anyone know what the holes in the bottom bracket shell are for on this Miyata?

http://cgi.ebay.com/Koga-Miyata-Gents-r ... dZViewItem

Thanks

Thunderchild


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PostPosted: Mon Mar 05, 2007 8:55 pm 
Retro Guru
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Joined: Mon Jan 15, 2007 10:34 am
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Location: Aberdeen, Scotland
So the hamster that moves the axle can breathe.


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PostPosted: Mon Mar 05, 2007 10:25 pm 
Gold Trader
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Joined: Sat Jul 29, 2006 11:14 pm
Posts: 3833
Location: Somerset
Many bikes have holes or slots in the BB shell.

1. Weight saving on lightweight specials.
2.To let water drain out of the frame, only useful on cartrige BB bikes. (My Orange has this feature).
3.Fashion.

Those are the only reason's I know.


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PostPosted: Mon Mar 05, 2007 11:27 pm 
Concours Judge
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Joined: Wed Jul 06, 2005 3:59 pm
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Thunderchild,

Both my 81 ProRacer and my 84 ProRacer-S have those holes.

Showing the 81 ProRacer:

Image
Topic on this bike, with many pics

My ex pro 80 Koga Miyata FullPro-L even has 'M's cut out the shell, like shown on this bike in the 1978 Miyata Jp catalogue:

Here, in the Retrobike Gallery

As Stick Legs says, it probably has to do with weight saving. Moreover the Japanese are very into perfectioning and detailing and that will pretty sure also have something to do with it.

More Japanese brands do this, for example Nagasawa:

Image

Another:
Image


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PostPosted: Tue Mar 06, 2007 5:53 am 
Old School Hero
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Joined: Mon Jun 26, 2006 6:11 am
Posts: 173
Location: USA
Thanks for the pics Elev12k. In my 20 years mtbiking, I have never seen such frames. I have been so sheltered... Seems like dirt, water, earthworms, shrews, beetles, etc. might find their way in to the bb bearings, threads, etc.

Later
Thunderchild


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PostPosted: Tue Mar 06, 2007 9:24 am 
Concours Judge
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Location: a proper EU country
The bearings are covered and always use sufficient grease when you mount a BB.


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