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I wonder if the increased resilience also increases rolling resistance?
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A local community paved a section of a bicycle trail with an asphalt/rubber blend for a short period of time. You noticed it immediately when you hit it. It was like peddling through molasses. That section has since been repaved with regular asphalt.
I read a few months ago that some playgrounds were removing the recycled rubber mulch due to toxic chemicals leaching from the rubber.