Mark IV Module Steering Gear Ratio

What is the SDS Swerve Mark IV Steering gear ratio?

Docs say 12.8:1. But the gears that I count are 15 : 32 and belt pulleys 10:40, which results in a 8.53333.

I know I’m missing something obvious here.

You probably miscounted the belt pulley as it is 15 : 32 and 10 : 60, not 10:40

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I’m guessing you were fooled by this:

The large pulley is intentionally missing teeth to ease manufacturing. Due to the large size and wrap, it doesn’t cause an issue.

(This part is a MK1 pulley, but I believe the subsequent revisions have used the same tooth profile.)