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PostPosted: Thu Aug 22, 2013 12:01 am 
retrobike rider
retrobike rider

Joined: Sat Dec 12, 2009 6:15 pm
Posts: 526
Location: western sussexshire
Hi, I'm looking at some old 737 crank arms (to buy) and have no idea if they are JIS or ISO square taper? Also, would like to know the chainline (middle ring) with a standard 113mm BB if anyone should have such info?

Lastly, any known issues with these cranks, as they need to be durable for my riding style/abuse :shock:

Cheers
:)


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PostPosted: Thu Aug 22, 2013 8:08 am 
retrobike rider
retrobike rider
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Joined: Sun Feb 19, 2012 10:08 am
Posts: 6840
Location: Nth Somerset, UK
I've just fitted 737 cranks to my Caygill.

113mm should be the right sized BB. Sheldon recommends 107 to 113, I went for 107 and ended up with 113, which was the only size that did not see the granny ring clash with the chain stays. It does seem to have given me a 51mm chain line, but the XT front mech has no issues reaching all three chain rings, although I am using XT thumbies, which may help.

I've no idea whether they are ISO or JIS; mine appear to have had a slightly chequered past, and sit well onto the tapers of a standard Shimano BB, although they are nice and tight, with no looseness or creaks.


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PostPosted: Thu Aug 22, 2013 8:16 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
All Shimano cranks are JIS.


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PostPosted: Thu Aug 22, 2013 8:17 am 
retrobike rider / Gold Trader
retrobike rider / Gold Trader

Joined: Sat Jul 21, 2007 9:48 am
Posts: 6974
Location: Bristle
all shimano cranks are JIS - JIS stands for Japanese Industrial Standards. Shimano being the dominant force mean most stuff is JIS these days

Most Campag are ISO....


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PostPosted: Thu Aug 22, 2013 8:34 am 
Retro Guru

Joined: Sat Dec 29, 2007 7:21 am
Posts: 794
Location: Hobart, Tasmania, Australia
JIS.

Not all Shimano is JIS, some Dura-Ace Track groups are ISO, well, more accurately somewhere halfway between the two.


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PostPosted: Thu Aug 22, 2013 10:30 am 
retrobike rider
retrobike rider

Joined: Sat Dec 12, 2009 6:15 pm
Posts: 526
Location: western sussexshire
Thanks guys, I assumed JIS but wasn't 100%. The other question is will a modern-ish 5 bolt chainring fit on these. It's for a Rohloff geared bike btw. SJS do a reversable 38T which I would like to use http://www.sjscycles.co.uk/thorn-110-mm ... prod11053/

?

Cheers


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PostPosted: Thu Aug 22, 2013 10:39 am 
retrobike rider
retrobike rider
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Joined: Sun Feb 19, 2012 10:08 am
Posts: 6840
Location: Nth Somerset, UK
It's a 94/58 compact, so any ring with the right BCD will fit.

I have a combination of Middleburn, Vuelta and Stronglight on mine.


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PostPosted: Thu Aug 22, 2013 10:43 am 
retrobike rider
retrobike rider

Joined: Sat Dec 12, 2009 6:15 pm
Posts: 526
Location: western sussexshire
So that mean 94mm bcd Neil? Not sure I've understood that..


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PostPosted: Thu Aug 22, 2013 10:50 am 
retrobike rider
retrobike rider
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Joined: Sun Feb 19, 2012 10:08 am
Posts: 6840
Location: Nth Somerset, UK
Woodsman wrote:
So that mean 94mm bcd Neil? Not sure I've understood that..


YUP!

94 bcd outer and middle, 58 bcd granny.

But as you won't be using outer or granny, 94 bcd it is.


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PostPosted: Thu Aug 22, 2013 10:52 am 
retrobike rider
retrobike rider

Joined: Sat Dec 12, 2009 6:15 pm
Posts: 526
Location: western sussexshire
Thanks Neil


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