I heard the rears are something in a 160 range, but yet again, it’s unconfirmed. One thing to keep in mind is that there were 4 different Sidekick/Tracker models produced. The spring rates as well as lengths are known to be different between say, 2Dr sidekick and a four door one.
There was also a 2Door 2WD Tracker, which rode lower than a 4WD, suggesting the springs may have been shorter or softer or both and the later 4 Door Sport, with different ride characteristics. Evidently this is a result of a wider track and 16-inch wheels, but also possibly different springs.
One thing for sure: no one knows exactly what they are.