Originally Posted by
flammenwurfer
Can you use a 1/8" chain with a stock 10 speed chainring? Or would you have to change the rear cog to 3/32" or get a new chainring?
You can use the wider chain on the thinner chain ring. It's not ideal; the chain has more room to slop around, side-to-side, and will come off more frequently than it would off a thicker chain ring. Not a big deal, though.
Originally Posted by
flammenwurfer
Another related question. A 10 speed has two chainrings. Is it as simple as removing one chainring? Are new chainring bolts needed?
That depends entirely on the crank. I've seen a lot of cheap cranks that were swaged and riveted together, and very difficult to separate. With better cranks, where the drive side crank arm and spider comprise a single forged unit, the chain rings are bolted on and are easy to remove.