Reply to Dubstep BPM Question

I notice that dubstep tracks are sold and labeled as 140 BPM (for example).

When I listen to them they sound like 70 BPM to me. The snare lands on the 2 and 4 beat right ???

Why are they labeled 140 BPM ? What does Traktor/Serato etc. usually analyze them at?

That high 140 BPM sounds strange to me as the beat groove is slow like 70 BPM.

Thanks.

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