4th or 5th, can't remember to be honest 
(edit) Actually, I have a feeling it varied from one car to the next, so they could chose the gear that got closest to 1:1 gear ratio.
(edit again) Also, they took a RPM signal which, when combined with the roller speed, helps improve accuracy.
(edit) Actually, I have a feeling it varied from one car to the next, so they could chose the gear that got closest to 1:1 gear ratio.
(edit again) Also, they took a RPM signal which, when combined with the roller speed, helps improve accuracy.
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