So I've got my stuff gettin powdercoated right now, and I wanted to drill out my new apes for internal wiring. It already has the dimples for the grips, but how big of a hole do I need to make for the wiring in the dimples AND at the bottom of the bars (by the risers)? Thanks

 

You want at least a 7/16" hole at the controls. 1/2" would make it a bit easier. I've tried both and they will each work. In the center you want a 1" slot (use the same diameter hole as the ends).

Make sure you file down the holes real smooth. Run a piece of tissue paper around the rim to check for snags.