I'm running an almost identical setup, 42/26T front, 12-29 9-speed rear, 
111mm BB, and don't have this problem at all
What chain are you using?  I did have a SRAM 9-sp chain dusting the 
chainstay in big ring front, smallest rear cog, but eliminated that with a 
Wippermann chain.  

On Sunday, August 2, 2015 at 10:25:05 PM UTC-5, RDS wrote:
>
> Rear spacing is 130 on the Soma San Marcos.  I have tried a 110 BB and 
> currently a 118 BB.  Same issue using both BB's.  Again, this is just in 
> the workstand setting things up.  Meaning, I have not rode the bike yet. 
>  Installed the crank on a VO Campeur and the Soma San Marcos and same issue 
> on both.  So, asking the question from ignorance as I am a novice mechanic 
> at best.  Thanks for the feedback.
>
>

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