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In the 2011 Mazda CX7, the engine options come with a timing chain, not a belt. Although both timing chains and belts effectively serve the same purpose, the choice between them ultimately boils down to cost and durability. Chains tend to last longer than belts, but they are pricier to fix if problems arise. Belts may operate quieter than chains due to their lighter rubber construction, but this difference is not very noticeable.
The engine of the 2011 Mazda CX-7 uses a timing chain.
A timing belt is a crucial component of an engine that ensures the proper operation of the internal parts by synchronizing their movements.
A chain that controls the timing of engine valves.