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So this is a 130bcd crank with a 36t inner ring...

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So this is a 130bcd crank with a 36t inner ring...

Old 07-16-16, 08:24 PM
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mstateglfr 
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So this is a 130bcd crank with a 36t inner ring...


130bcd is a 38t ring at smallest, i thought.
What am i missing here?
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Old 07-16-16, 08:53 PM
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Isn't that a 110 bcd?
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Old 07-16-16, 09:03 PM
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I have 6207 cranks on my Centurion Ironman and they are 130BCD. Worked perfectly with the Race Face chainrings they're practically giving away on Nasbar.

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Old 07-16-16, 09:14 PM
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How do the get the bolts in a 36 tooth chainring with a 130 BCD?
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Old 07-16-16, 10:16 PM
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Thats a mix of cranks , Drive Side Deore XT (FC-M730) and then Shimano 600 (FC-6207) on the other.

Deore XT (FC-M730) is 110 not 130. Not sure where 130 is coming from
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Old 07-16-16, 11:39 PM
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Old 07-17-16, 08:18 AM
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Originally Posted by fleslider View Post
Thats a mix of cranks , Drive Side Deore XT (FC-M730) and then Shimano 600 (FC-6207) on the other.

Deore XT (FC-M730) is 110 not 130. Not sure where 130 is coming from
And there it is. Makes sense now.
Thanks
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Old 07-17-16, 11:59 AM
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Not possible....according to Velo News

"A little geometry lesson is clearly in order. No, there is no such thing as a 36-tooth chainring for a 130mm bolt-circle-diameter (BCD) crank. That’s because 130 BCD means that the centers of the chainring bolts are 65mm from the center of the crank spindle. But the smallest chainring, with tooth valleys external to chainring bolt holes drilled on a 130mm bolt circle, has 38 teeth. A 36-tooth would not work, because the bolts would be among the chainring teeth! (The valley-to-valley diameter of a 36T chainring is 137mm, but the heads of the crank bolts are 11mm across, so the outer edges of the crank bolts on a 130mm bolt circle scribe a circle 141mm in diameter, thus overlapping where the chain needs to go by 2mm.)"

Read more at Technical FAQ: Chainring and cog compatibility - VeloNews.com

Too bad.... I'd love to have a 36T inner ring
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Old 07-17-16, 04:50 PM
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Originally Posted by plonz View Post
I have 6207 cranks on my Centurion Ironman and they are 130BCD. Worked perfectly with the Race Face chainrings they're practically giving away on Nasbar.

Yeah, but your photo clearly shows a 39 tooth inner ring, not a 36 tooth.
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Old 07-17-16, 05:04 PM
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Originally Posted by AlexCyclistRoch View Post
Yeah, but your photo clearly shows a 39 tooth inner ring, not a 36 tooth.
You sir are absolutely correct. I was just confirming the crankset was 130BCD.
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