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PostPosted: Wed Sep 28, 2011 8:58 pm 
Old School Grand Master
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Joined: Mon Sep 28, 2009 8:16 pm
Posts: 3275
Location: north wales
Hi everyone
Looking for a 50/34 compact chainrings to fit my truvativ Isoflow 5-arm crank
130bcd.
New or very good condition prefered
Anyone!


Last edited by cipolinni on Wed Sep 28, 2011 9:23 pm, edited 1 time in total.

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PostPosted: Wed Sep 28, 2011 9:08 pm 
Retro Guru
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Joined: Wed Mar 09, 2011 6:01 pm
Posts: 1339
Location: Birch, Essex, UK
So can i assume you don't want my Shimano R700 cranks?


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 Post subject: chainrings
PostPosted: Wed Sep 28, 2011 9:22 pm 
Old School Grand Master
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Joined: Mon Sep 28, 2009 8:16 pm
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Location: north wales
Sorry for not replying sooner
I'm going to lookfor some compact rings for my truvativ cranks.
It's like new with bb
Thanks


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PostPosted: Wed Sep 28, 2011 9:47 pm 
Retro Guru
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Location: Birch, Essex, UK
Sooner?...you didn't reply...no matter....but your request is for 135 bcd chainrings...thats Campag.....compact is 110 bcd


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 Post subject: chainrings
PostPosted: Wed Sep 28, 2011 9:53 pm 
Old School Grand Master
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Location: north wales
Sorry should read 130bcd
So they don't make 130bcd compact rings?


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 Post subject: Re: chainrings
PostPosted: Thu Sep 29, 2011 1:19 am 
Retro Guru
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Location: Letchworth Garden City
cipolinni wrote:
So they don't make 130bcd compact rings?

No, due to physics the smallest ring you can get on a 130mmBCD is 38T, a 37 would have the bolt holes overlapping into the lower part of the teeth.

So if your chainset is 130mm then you're stuck with 38.


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PostPosted: Thu Sep 29, 2011 8:09 am 
Retro Guru
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Location: Birch, Essex, UK
Compact is deemed as 110 bcd....not 130bcd or 135 bcd


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 Post subject: compact
PostPosted: Thu Sep 29, 2011 8:15 am 
Old School Grand Master
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Joined: Mon Sep 28, 2009 8:16 pm
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Location: north wales
Thanks guys for the info,not clued up on the modern stuff.
I'll have a re-think.
Malc


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