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PostPosted: Wed Apr 10, 2013 10:48 pm 
Dirt Disciple

Joined: Wed Mar 27, 2013 11:37 pm
Posts: 93
Location: Bristol
Evening,

I'm attempting to put together a new Deore chainset. Old cranks cleaned up, new rings purchased from CRC. Inner and outer rings go on fine, middle one just seems to be the wrong size or the spider is not the right model of deore?

Appreciate your thoughts on this?

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JT


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PostPosted: Thu Apr 11, 2013 12:22 am 
Retro Guru

Joined: Mon Sep 28, 2009 11:14 am
Posts: 347
Location: Lancashire
Looks fine to me but Do all the bolt's fit in?


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PostPosted: Thu Apr 11, 2013 2:18 am 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4431
Location: Herts UK
are you saying the bolt holes do not line up?

notice the notch on the inside of the ring, at 12 o'clock position - this usually should be in line with the crank - in your case, rotate the ring by 90 degree/1 bolt hole to the right.


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PostPosted: Thu Apr 11, 2013 11:00 am 
Dirt Disciple

Joined: Wed Mar 27, 2013 11:37 pm
Posts: 93
Location: Bristol
It's the grey lumps (circled below). Wondering if I got a funny shaped spider?

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PostPosted: Thu Apr 11, 2013 11:41 am 
Old School Grand Master
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Joined: Sun Aug 21, 2011 11:57 pm
Posts: 4074
Location: Antwerp, Belgium
Either that or you have a funny-shaped chainring.

If the bolts all fit the holes, I wouldn't worry about it.


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PostPosted: Thu Apr 11, 2013 11:49 am 
Retro Guru
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Joined: Thu May 03, 2012 7:13 pm
Posts: 2574
Location: The Cock Inn, Tillett, Herts
I think those bumps are to stop the chain getting wedged between the granny and middle rungs if it comes off.


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PostPosted: Thu Apr 11, 2013 3:04 pm 
Section Moderator & South West AEC
Section Moderator & South West AEC
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Joined: Mon Jun 25, 2007 3:33 pm
Posts: 8157
Location: new forest
this was a shimano-ism to make you buy the specific rings for the chainset to protect their spares market. even some of their own rings don't fit but the bolt pattern is right.

simplest thing to do is carefully (or hamfistedly, which ever you capable of!) file the crank arm till they fit, had to do it on some xt cranks to make TA rings fit a while ago.

:)


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PostPosted: Thu Apr 11, 2013 3:16 pm 
Dirt Disciple

Joined: Wed Mar 27, 2013 11:37 pm
Posts: 93
Location: Bristol
Thanks all, will get the files out tonight!

JT


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PostPosted: Thu Apr 11, 2013 11:19 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
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Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
File the ring not the arm!! Takes 2 seconds. You will probably only have to file 2 of the tabs. Also looks like the correct orientation? The pin by the arm.


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PostPosted: Thu Apr 11, 2013 11:43 pm 
MacRetro rider
MacRetro rider

Joined: Thu Jul 30, 2009 4:56 pm
Posts: 2473
Location: A Fifer furth o' the Kingdom
I had the same problem with a set of Shimano cranks and new Shimano rings.
As has been said, file the ring not the cranks, it's much easier. The ring is disposable, eventually, due to wear, I'd rather keep the cranks original in case the next set of rings actually fitted without filing.


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