Our mini-series on Gearing, sponsored by Sportbikewrench.com, continues with a look at the gearing changes required by two very different tracks that are back to back on the AMA schedule, Infineon Raceway in California and Road America in Wisconsin. We talk to the man who has been there for all 7 of Mat Mladin's AMA championship, Crew Chief Peter Doyle, for their theory on gearing a motorcycle for two distinctly different tracks.

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