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ededwards
 Post subject: Merckx b/b query
PostPosted: Sat Nov 20, 2010 7:20 pm 
Pumpy's Bear
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The Corsa Extra always has an Italian thread, right? But does shell size vary - the cups on a 600 b/b I had off another Corsa Extra just too small.

A bit confused :?
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Elev12k
 Post subject:
PostPosted: Sat Nov 20, 2010 7:37 pm 
Concours Judge
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The diameter is smaller? That must be Belgian treading :lol:

Ed, it sounds a bit like the 600 is British. Italian is larger diameter and threads the other way round on the drive side.

British says 1.37
It says 1.36..
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ededwards
 Post subject:
PostPosted: Sat Nov 20, 2010 7:49 pm 
Pumpy's Bear
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Elev12k wrote:
The diameter is smaller? That must be Belgian treading :lol:

Ed, it sounds a bit like the 600 is British. Italian is larger diameter and threads the other way round on the drive side.

British says 1.37
It says 1.36..


Thanks Mel, as you say, it is 1.37 but that has me confused as it came out of another Corsa Extra so I was pretty sure I could just pop it in and off I went. Oh well.
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garethrl
 Post subject: Re: Merckx b/b query
PostPosted: Sun Nov 21, 2010 12:12 pm 
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Hi Ed,
My Corsa takes an Italian BB. It hadn't even occurred to me that it might be the case so imagine my surprise when the British one I'd bought for it slid straight through! :roll:

As a sanity check, measure the BB shell width. Italian is 70mm, British is 68mm. There may be slight variations, but 2mm would be extreme.

Cheers,
Gareth.

ededwards wrote:
The Corsa Extra always has an Italian thread, right? But does shell size vary - the cups on a 600 b/b I had off another Corsa Extra just too small.

A bit confused :?
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dbmtb
 Post subject:
PostPosted: Sun Nov 21, 2010 4:17 pm 
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Every steel Mercxx I've had my hands on has been Italian thread.
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ededwards
 Post subject:
PostPosted: Sun Nov 21, 2010 6:25 pm 
Pumpy's Bear
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dbmtb wrote:
Every steel Mercxx I've had my hands on has been Italian thread.


Exactly, even the mid 70s 531c I had was Italian threaded hence my confusion.

Only thing that I can think of is that the 600 b/b that I thought came out of the 7-11 Corsa Extra was in fact out of another frame - but the groupset on the bike was 600 throughout so seems weird as I definitely swopped out the b/b when I fitted a Campag chainset. Oh well, one of lifes little mysteries I guess.
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