Author Topic: hardtail frame for 38t  (Read 193 times)

lud1

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hardtail frame for 38t
« on: February 13, 2018, 12:51:51 PM »
hi there, this is my first post, so please be gentle...I'm very frustrated with my first build, so I came here looking for help:

I recently bought my first chinese carbon frame to build a hardtail mtb. I chose FM-M009, I reckon many of you already know said frame. after the frame I bought a whole load of other parts, including just recently the xx1 eagle groupset with a 38t chainring. I had big trouble fixing the crank with this large chainring and only managed to with the help of a large spacer, which in turn totally f***ed up the chainline.

from what i can tell this frame won't even fit a 36t one, and since I mainly do long tours and not so much hillclimbing or downhill, I really want to use the 38t chainring.

so, to make it short, can you guys recommend a lightweight carbon frame I can fit a 38t chainring on?

thanks in advance! sorry if this topic already exists, I searched, but didn't really find anything...
« Last Edit: February 13, 2018, 01:06:35 PM by lud1 »



carbonazza

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Re: hardtail frame for 38t
« Reply #1 on: February 13, 2018, 08:26:12 PM »
I ride a 38T on a 041 frame with plenty of room left.
Which is unfortunately not produced anymore by Peter at xmcarbonspeed.com

Maybe it is built by another vendor still to be found.
I think I saw it popping out in an AliExpress search already.

Or you may ask him what frame he sells now that could do it.

The M009 frame is definitely a 34T frame.

carbonazza

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Re: hardtail frame for 38t
« Reply #2 on: February 14, 2018, 10:35:41 AM »
I fit in a 38t with pretty decent chainline inline with the 4th cog from the 11t on a 10 speed cassette.

On a M009 frame ?
Do you know the distance between the ring and the center of the frame ?
Did you use a spacer ? If so how wide it is ?

pumajr

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Re: hardtail frame for 38t
« Reply #3 on: February 14, 2018, 12:52:06 PM »
You will definitely have to modify the chain line to fit anything more than a 30.  We put a 30 on my sons build and even that was a tight fit. 

carbonazza

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Re: hardtail frame for 38t
« Reply #4 on: February 14, 2018, 01:06:43 PM »
You will definitely have to modify the chain line to fit anything more than a 30.  We put a 30 on my sons build and even that was a tight fit.
It probably depends on the crank you use.
An Eagle GX crankset ( with GXP BB ) allows a 34T with still some room left, may be a 36T could even fit.

pumajr

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Re: hardtail frame for 38t
« Reply #5 on: February 14, 2018, 01:08:43 PM »
That is good information to know for an upgrade in the future.  We used an older shimano deore crank set.  38t would definitely test the limitations of the frame. 

dopestar

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Re: hardtail frame for 38t
« Reply #6 on: February 18, 2018, 09:09:13 AM »
instead of changing your frame try to use 9x11 instead so you don't need to use 38T

Jerryno

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Re: hardtail frame for 38t
« Reply #7 on: February 18, 2018, 02:45:08 PM »
The CS-MB01 http://www.xmcarbonspeed.com/Productinfo.asp?f=1392 can fit up to 40T. It is made for large chainrings.