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PostPosted: Thu May 30, 2013 10:52 pm 
Retro Guru
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Joined: Sun Sep 30, 2012 9:02 pm
Posts: 1180
Location: In the Garage in Somerset
I recently built up my kona with a nice M737 set up, chain set, hubs, sti, front and rear mechs. Happy days!

Now I wanted to bling it up a bit so got an SRP hanger bolt for a xt rear mech.

However what I didn't realise at the time was that the bolt in a 737 is shorter than in a 739, the alloy casting is much narrower at this point.

First question: is it possible to still get anodised hanger bolts for m737's?

Secondly: cage length!

At the moment I've put my nice SRP bolt to good use in a nice 739 I had stashed. However it's a medium cage mech 32t max 33t total. I'm running a 22/32/44 chain set with an 11-28t block. Is this mech ok to use on this setup or should I revert to a long cage mech?
(I don't use the big ring and biggest sprocket at the same time, nor the granny and smallest sprocket)


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PostPosted: Thu May 30, 2013 11:58 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
Short cage will be fine - I run a 11-30 with 22/32/44 with no problems.

I got caught out on the 737/739 difference when I tried cannibalising one to repair another.


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PostPosted: Fri May 31, 2013 6:08 am 
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Joined: Sun Sep 30, 2012 9:02 pm
Posts: 1180
Location: In the Garage in Somerset
What did you try to swap? I was thinking about swapping the cages round if I ever had a reason to.


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PostPosted: Fri May 31, 2013 10:19 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
It was the pivot bolt! One had seized up and corroded, so I thought I would use the other. :facepalm:


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PostPosted: Fri May 31, 2013 10:39 am 
Old School Grand Master
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Joined: Sun Mar 14, 2010 3:07 pm
Posts: 4211
Location: London for my sin's
The pivot bolt is the main difference. the cages will swap wiht no issue.

Tbh i always preferred the mid length cage to the long (horses for courses) the long will wrap more chain but you would only notice in combos you would not normally use (small - small etc)


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