Originally Posted by
ThermionicScott
Today, I did a bunch of work to make a slightly bigger chainring fit.
<stoolcrorybo>
Since my bike started out as a mountain bike, it didn't have much chainstay clearance. I've been wanting to bump up my gearing a little, but didn't want to go smaller than 15T on the cog. So I took the bottom bracket apart and used a 1mm freewheel spacer to scooch it over (you can see a shiny sliver next to the bottom bracket shell). I repacked it, mounted a 42T Sugino ring I had lying around, and it all worked. The 41T ring I was using is below it.
This raises my gearing from about 69.4 to 71 gear inches. Yay.
</stoolcrorybo>
I had the same problem, a few teeth on a 41t were grazing my frame.
If needed, can you mount the chainring on the side closer to the arm?