Abstract: The present invention relates to an abrasion resistant composite material structure whose surface is laminated with an abrasion resistant layer, so that the composite material structure can be kept from abrasion.

Abstract: A method for forming control of composite material product comprises: adding foam material in predetermined portions of composite material before composite material product being formed, during forming process of the handlebar, the foam material in the composite material will be inflated to produce a stretching force for eliminating undesired deformation of the composite material production. The deformation-resistant composite material product comprises a foam material integrally formed in the composite material product.

Abstract: A seat post assembly provided for position the seat with support beam, the seat post assembly is provided on the bottom thereof with two locking blocks and comprising: a post; a head mounted on top of the post and provided with two threaded positioning surfaces which having an axial hole; two clamp elements assembled to both sides of the head, each of the clamp elements provided with a threaded jointing surface which having a through hole, and a locking groove; a locking unit passing through the through hole of the clamp elements and the axial hole of the head for enabling the clamp elements to be locked with the head and positioning the locking blocks into the locking groove.