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From what I've seen in other threads it seems the factory uses a variety of springs, based on what options the car has. So, there could be several spring rates for an MCS non-sport, for example.
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Robin Casady Bombadil: 2007 MINI Cooper S, R56, Pure Silver, LSD, Wood Shift Knob, Rota Slipstream 16x7, NAV, HIFI...
This info is burried in the TSW R56 lowering spring thread. From what I recall the rates are somewhere around 155F/212R. Robin is right though it varies depending on how your car is optioned but the variation is probably not allot.