Technically your ratios CAN change by swapping these components:
1. If you get main spring bind, it will reduce your CVT range - That's a poor choice in springs.
2. If your variator weights are too light, they will never push the belt to the top of the pulley - Again a poor choice in weights.
3. Using slider weights instead of rollers allows greater range of the variator pulley due to their shape (plus sliders last longer).
The main spring really should not be rated in RPMs, but it is a measure people are accustomed to when dealing with clutch arm springs. As long as you know the heavier the spring the quicker the downshift and tighter the belt, it doesn't matter what linear measure they use.
BTW: Clutch engagement RPM is based on how fast the clutch is spinning and not directly the engine speed. Since you can change CVT shift rates by changing the variator weights and main spring, you are also changing clutch engagement at different engine speeds.
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