Author Topic: XM carbon speed FS27  (Read 1618 times)

mercenary

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Re: XM carbon speed FS27
« Reply #15 on: September 27, 2017, 03:26:50 AM »
are you guys running cranks with boost compatibility? I think it moves the chainring out 3mm, but I have no idea if that would help?

MVinter

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Re: XM carbon speed FS27
« Reply #16 on: September 27, 2017, 05:40:38 AM »
Direct mount cranksets (RF cinch, sram DM...) is not boost specific. You just change chainring with another offset. That way you get correct chainline.

I have RF next with boost specific chainring (AB 28t oval) and the chainline is good.

mercenary

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Re: XM carbon speed FS27
« Reply #17 on: September 27, 2017, 06:39:10 AM »
So any chance we can run this with a 32t or 34t?

MVinter

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Re: XM carbon speed FS27
« Reply #18 on: September 27, 2017, 06:59:43 AM »
I would gues a wider chainline is needed. If you run round 32t it should be sufficient with a thin spacer om the drive side.

mr_manny

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Re: XM carbon speed FS27
« Reply #19 on: September 27, 2017, 07:29:37 AM »
Direct mount cranksets (RF cinch, sram DM...) is not boost specific. You just change chainring with another offset. That way you get correct chainline.

Sram makes a DM Boost chainring, I'm running one on my stache.

If you google, you will find 3mm boost offset DM Sram X-sync chainrings.

fyi

MVinter

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Re: XM carbon speed FS27
« Reply #20 on: September 27, 2017, 07:41:36 AM »
That was what I tried to tell you. The crankset is not boost specific, it's the chainring that makes the chainline 51mm, 54mm or 57mm...

bxcc

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Re: XM carbon speed FS27
« Reply #21 on: September 27, 2017, 01:40:52 PM »
Like others have stated, it all depends on the crankset and chainring combination. If you are running Sram cranks with a threaded BB and need some extra clearance, you could go with a WolfTooth GXP ring for a BB30 crank. It has 0 offset so it will sit a little further out. Putting a drive side spacer on a GXP crankset doesn't accomplish anything in terms of spacing.