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I think what you’re saying is that it’s 10mm of shock travel until contract with the bump stop. Travel at the wheel will be slightly larger because the suspension geometry will compress the spring less, then the shock, then the wheel.
If this is correct, and I don’t doubt it from other posts I’ve read, then you’ll get ~15mm travel (at the wheel) of the rear spring rate, then a combination of rear spring plus bump stop until they both compress to the point of being solid. How far that travel is depends on the combination of the bump stop and spring.
You have to understand that the bump stop in our cars is not a solid block of rubber, it’s part of the spring / shock / geometry design, and a change to it can make a big difference. It’s completely reasonable that BMW May have designed it to operate this way, and lowering springs alone (or coil over kits that aren’t true coil overs in the rear) will need some modifications to the bump stop if you’re lowering.
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