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Discussion Starter · #1 ·
Dude, this is not typical 29er topic but need your help.
I would like to use FC-M570's spider (5arms 94PCD/ I need 30t for my next 29er plan) for FC-M750 (XT) crank arm. But not sure about these spider compatibility. I know FC-M750 & FC-M792 are same spider spec, but don't know about FC-M570.
Unfortunately, FC-M750's spider already gone from the market, so I need inexpensive (=means no FC-M792) substitution.
 

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My understanding is that the LX (M570) spider was thicker than the XT (M750) and XTR (M950,M952). The spline is the same, but I don't think you can switch between them without doing some dremeling. My experience is limited to the XT and XTR models, though, so I'm not posiitive.

EDIT: This ought to work for you though:
http://www.webcyclery.com/product.php?productid=16704&cat=310&page=1

 

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angrybee said:
Dude, this is not typical 29er topic but need your help.
I would like to use FC-M570's spider (5arms 94PCD/ I need 30t for my next 29er plan) for FC-M750 (XT) crank arm. But not sure about these spider compatibility. I know FC-M750 & FC-M792 are same spider spec, but don't know about FC-M570.
Unfortunately, FC-M750's spider already gone from the market, so I need inexpensive (=means no FC-M792) substitution.
Compatibility issues aside, there are other solutions to get to a 30t front chainring. If your goal is to use the cranks you have I bet Boone can make a ring for you.
 

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Discussion Starter · #4 ·
Yep, thickness maybe different, so AC spider seems to be a safer bet.
And I keep boone spidered chain ring as final solution but I know it costs high. FC-M570 spider costs only $18 at the othe side of pacific (I live near Shitmano town).
I think 94pcd cranks should come back by popular demands especially 29er 1x9 sepup.

anyway, mucho gracias, dude:)
 
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