You've gotta remember that the Arachnid tires are basically just Kenda clones, so they really
NEED the higher pressures (28-32psi or there-abouts) in them to carry the load of your Spyder, even tho it's faily small!! So yeah, 24 psi in an Arachnid (or a Kenda) on the rear is probably too low for the loads most of us impose!
The lightweight 2 ply construction of the Kendas & Arachnid tires rely on those higher OE specified pressures to keep all the metal bits safely off the ground & still meet the traction, ride, & handling needs of a Spyder; it's really only when you swap over to running 'normal' passenger car tires with their heavier construction and their design ability (expectation?) to carry significantly heavier loads at those 28-32 psi pressures that you'll need to lower their pressures somewhat to suit the significantly lighter loads of a Spyder & ryders, loads etc impose vs a car... :thumbup: