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Originally Posted by sperry
The reason you see MacPherson struts on rally cars (and stuff like monster trucks and off-road racers) is because they need a way to let the suspension travel long distances.
Imagine that Double A-Arm in a configuration that would allow say a foot of travel... the arms would have to be very long. So on a vehicle that doesn't have space for long control arms, you have to go with a MacPherson strut. Some cars can get away with it (look at the unlimited Baja buggys) but any sort of production vehicle that has stuff like a motor or passenegers between the wheels, there's just not space.
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Overall good points, but the above doesn't necessarily ring true. A McStrut still has a lower control arm, so you have similar LCA length requirements if you're designing for a lot of travel.