Like Gustavo, I went with the 16tooth, speedo is then almost 100% accurate.
Only downside your odometer now slightly over reads, so you think your mpg has gone down, but its actually gone up, if you can follow that.
Big plus is getting calming down the admittedly minor buzz at freeway speeds.
FYI, if you go with a 16tooth, you'll need to borrow/use a breaker bar or impact wrench to get the drive nut off. Most of them were put on by a gorilla with a faulty torque wrench.
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