Hello,

I've been building my Susie over the past couple of days, and just 
discovered I've got an issue with the chain rubbing the rear tire when I'm 
in the lowest gear.  It's a Shimano 2x12 drivetrain, and seeing as it's not 
a square taper BB, and has more than 9 speeds, I'm out of my league.  The 
tire is a 2.6 Teravail.  Does anyone have experience with this kind of 
problem?  

The only real solution I can think of is to add a 2.5mm spacer to the BB's 
drive side.  The chain just ever so slightly touches the tire now, and so 
I'm hoping that moving the chainrings out 2.5mm will be enough to solve the 
problem.  BUT.... 

A part of me wonders whether this is advisable.  Will my shifting be 
compromised due to altering the chainline of the crank?  Will widening the 
space between the BB's cups harm the BB due to lessening the thread 
engagement?  Will it harm the cranks for the same reason? Is this solution 
more of a problem than the rubbing problem? 

What about other solutions?  Does anyone have any advice?  This is driving 
me crazy, and I'd really love to hear any and all suggestions!

Thank you!

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