69 gear inches.

But I have to chuckle at the question. On the first couple of family rides two of my kids and my wife kept asking what gear they should be in. They were clearly agitated when I told them whatever gear made the peddling comfortable for the speed they wanted to go. They wanted a specific number, and finally they insisted to know what "number" I was in. I told them they're all different, ..and then they wanted to know how anybody could switch bikes and have a clue what gear number to use. And it just went on from there with no resolution. They're still convinced I'm clueless about bike gears.