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Why does your $25,000 Harley jerk and surge on a pneumatic lift while your neighbor's glides up smoothly on an air-over-hydraulic system? The answer lies in the fundamental physics of compressible versus incompressible fluids—and understanding this difference could save you thousands in equipment costs, prevent frustrating mid-service stalls, and determine whether you need to invest in an air compressor upgrade. With motorcycle lifts ranging from $949 to $3,908 in 2026, choosing the wrong power …