correct. 42x16 fixed, 39x18 single speed. it would look more traditional with the 42 on the outside but that is not conducive the the chain line on the hub (unless you want to ride fixed off road)

the chain will be protecting the outer ring when i am off road. the inner ring will be used for fixed road riding. it is not like there are derailleurs involved. this is a traditional turn the back wheel around setup.