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PostPosted: Tue Aug 13, 2013 3:15 pm 
gold | rider | rBoTM
gold | rider | rBoTM
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Joined: Sat Jan 05, 2013 5:06 pm
Posts: 10287
Location: The deep South
Hi folks ,

Hoping to pick some brains :roll:

I have just got hold of a Shimano M730 chainset for my Scott project , but am unsure what size bottom bracket to use with it . The shell size is 68mm , but I'm not sure what length axle it needs . I know that road axles vary in length , is it the same for mtb axles ?
Also , in your opinion , would a cup and cone b/b be more authentic in a '93 frame , or a cartridge job be more appropriate ?

Any help will be gratefully received , thank you kindly , Mike . :)


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PostPosted: Tue Aug 13, 2013 3:26 pm 
Dirt Disciple

Joined: Mon Jul 15, 2013 2:10 pm
Posts: 78
Location: Hungary
Around 120-122 mm, I think. I used 120 mm in my Scott Comp Racing.
It might depend a bit on the square of the arms. Two size exists, according to the JIS and the ISO standards. The JIS axles has bigger size ends if I remember well.
You have to match the axle with the arms...


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PostPosted: Tue Aug 13, 2013 3:32 pm 
Old School Grand Master

Joined: Tue Jul 05, 2011 8:42 pm
Posts: 3196
unless you are trying for best in show, i would get a new cartridge from CRC from about a £10

s/be 122.5 i think - but google Sheldon Brown Bottom Bracket size and you will get to a data base that list out most of the shimano chainsets


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PostPosted: Tue Aug 13, 2013 3:50 pm 
retrobike rider
retrobike rider
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Location: Yorkshire, England
122.5 was the standard length for the cranks and a cartridge bottom bracket is well and truly correct for 1993.

You would move to 127.5 if you only really needed to.

A year or two earlier and you'd be in Cup/Cone territory.


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PostPosted: Tue Aug 13, 2013 8:30 pm 
Gold Trader
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Joined: Thu Mar 26, 2009 8:52 am
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Location: Poland / Cracow
All Scotts I know takes 122,5 for M730 :)


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PostPosted: Wed Aug 14, 2013 8:57 am 
BoTM Winner / Gold Trader / Rider
BoTM Winner / Gold Trader / Rider
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Joined: Tue Oct 14, 2008 7:37 pm
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Location: Groningen, Netherlands
http://sheldonbrown.com/bbsize.html

Need I say more??

M730 always 122.5!


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PostPosted: Wed Aug 14, 2013 9:52 am 
Retro Guru
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Joined: Sun Oct 21, 2012 4:34 pm
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Location: worthing
Hi mate
i have a spare 68x122.5 your welcome to try if it helps :D
Cheers Paul


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PostPosted: Wed Aug 14, 2013 10:08 am 
retrobike rider
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stumpjumper1990 wrote:
http://sheldonbrown.com/bbsize.html

Need I say more??

M730 always 122.5!


Sheldon, bah.
I give you the horses mouth


http://www.retrobike.co.uk/gallery2/v/M ... 0.JPG.html

http://www.retrobike.co.uk/gallery2/v/M ... ewsIndex=1
etc...


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PostPosted: Wed Aug 14, 2013 3:44 pm 
gold | rider | rBoTM
gold | rider | rBoTM
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Joined: Sat Jan 05, 2013 5:06 pm
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Location: The deep South
Thanks for all your help , men of mountain bike mayhem :)


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PostPosted: Fri Aug 16, 2013 9:33 pm 
retrobike rider
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Joined: Wed Mar 03, 2010 11:59 am
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Location: Near Southampton
another 122.5mm here...


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