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The camshaft controls the timing of the opening and closing of the engine’s intake and exhaust valves. It is driven by the crankshaft through a timing belt or chain. The precision in the camshaft's motion is vital for optimal engine performance, as it ensures that the valves open and close at the correct times in relation to the pistons’ position. Variability in camshaft design can lead to enhancements in engine efficiency and power output.


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The second number, 65, represents the aspect ratio of the tire. This ratio is a percentage that describes the height of the tire's sidewall relative to its width. Specifically, the sidewall height is 65% of the tread width. For the 285/65R20 tire, the sidewall height would be approximately 185mm (calculated as 285mm x 0.65). A higher aspect ratio usually indicates a taller sidewall, which can improve ride comfort and absorb shocks from uneven terrain. However, it may also lead to less precise handling compared to tires with a lower aspect ratio.


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