SRAM Automatix Gearing Setup

I am putting together a single cog on an old road bike frame. I am building up an SRAM Automatix hub onto a Mavic 319 rim with a Continental Ultra Sport 2 28 mm tire.

I am planning to use a 38 front chainring and a 15 rear cog. The SRAM ratio change is 1.36.

Do these gear/inch values look...