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Most have been running #35 chain here. In the World Formula the Premier Titan is the spec clutch and the only one legal to use. It provides great durability and is very simple to service.
In the 206 cadet class, we run a combination of bare bones noram GE clutches or there are a few Premier Stingers being used.
The 206 cadet class had 6 this past weekend and continues to show progress bring new drivers into the sport with very easy and competetive power plant packages.