The class shake-up in this year's ALMS could make or break the series. AUTOSPORT investigates the changes to North American sportscar racing ahead of the 2010 opener at Sebring

In seven months' time we'll know if the American Le Mans Series' class system shake-up was a stroke of genius that brought big grids and great racing back to a faded championship, or a piece of knee-jerk tinkering that confused fans and alienated teams.

This time last year, a spectacular Sebring 12 Hours preceded a low-key season that turned into a rather flat two-horse race between two Acuras, thanks to Audi and Porsche pulling out and the adoption of full ACO rules preventing the LMP2 cars from threatening the LMP1s.

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