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A brand new project out of France, the brainchild of William Genovese, SpinShield aims to prevent flats but also to allow a rider to finish the run if it should happen. The green part is made of a harder material, it serves to lock the tire against the rim. The special valve is used to tighten the strip around the rim once installed, which should make it easier to install than some other systems. The white foam is softer, and designed to let you ride out your run. This is the DH version, there is also an enduro version which focuses more on protecting against pinchflats (different material used there).