Pneumatic tyre - with polyurethane or polystyrene granules in tread mixture
摘要
<p>The tyre or band of diagonal design has in the tread admixtures of deformable plastics granulated material 0.1-0.8 mm. in dia., forming 2-20% vol. of the tread mixture. The polyurethane or polystyrene (pref.) granules are spherical.</p>
