Yes, I understand subtraction- thank you.

I was thrown off by jmntn2000's remark which stated it would ONLY work with a 16t differential. That's simply incorrect.

I just got on SRAM's web site which confirms that 16t is MAX it can handle. That doesn't mean it's the only option. It clearly states it can handle a 53/39 which is what I was looking at. If SRAM made a 52/36 it would be ideal.