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 Post subject: Chainring Q
PostPosted: Thu Jan 31, 2013 6:20 pm 
retrobike rider
retrobike rider
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Joined: Wed Jan 18, 2012 2:28 pm
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Location: Bognor Regis
Hello everyone ; noobish question as I'm too Luddite to know but : Are all 4-bolt chainrings the same? I need to replace a 104mm BCD outer ring on an FSA crank and was frankly terrified by FSA's prices. Can source a Shimano Deore M530 at a better price so will that fit? Last time I bought rings they were 74/110mm so it's been a while :shock:
Thanks ; kampos/Dave


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 Post subject: Re: Chainring Q
PostPosted: Thu Jan 31, 2013 7:21 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
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Joined: Mon Aug 31, 2009 12:26 am
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Location: Rurally close.
Not all but the vast majority. It will generally state if its not (xtr m960 for example has its own specific rings).


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 Post subject: Re: Chainring Q
PostPosted: Thu Jan 31, 2013 10:03 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
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Location: Herts UK
cyfa2809 wrote:
(xtr m960 for example has its own specific rings).

tell me about it .... and each chain ring has its own set of bolts so you wold need single ring bolts as opposed to double bolts ....oh, and they OEM rings are £££!!!!! :shock: but it is a really pretty crank,


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 Post subject: Re: Chainring Q
PostPosted: Fri Feb 01, 2013 12:28 am 
Old School Grand Master
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Joined: Fri May 01, 2009 7:11 pm
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Location: Fircombe.
Some FSA 4 bolt chainrings are 95mm BCD...


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 Post subject: Re: Chainring Q
PostPosted: Fri Feb 01, 2013 10:07 am 
Gold Trader
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FWIW, some older Specialized cranksets have a weird (slighly smaller than 74) bcd for the granny ring. But, other than that and the FSA and XTR mentioned above, pretty much everything else 4 bolt is 104/74bcd. That said not everything fits everything else. Both my modern bikes have steel Truvativ rings on Shimano M760 cranks which work fine, but over the years I've noticed several rings that have required a little trim with a file to get them to fit on a crank - even when the brand is the same for both ring and crank.

So, in short yes... and no :lol:


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 Post subject: Re: Chainring Q
PostPosted: Wed Feb 06, 2013 5:08 pm 
retrobike rider
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Thanks guys ; I'm still dithering like a mad thing ; why can't makers just all agree to make rings universal.... :x


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