A straddle-type vehicle provided with a transmission air intake passage for sending air into a transmission case housing a continuously variable transmission prevents an increase in vehicle width and prevents sand or the like from entering the air intake passage by covering the front side of the air intake passage. The central tower is furnished at one side with a tubular ex-central opening, and the tower occupies a central tube for delivering the wood chips either upwards or downwards from the opening, whereby a service and passage space is formed between the mantle of the central tower and the transport tube. The interlayer is comprised of a Ni-alloy having the characteristics of being nonmagnetic and having an FCC structure. This effect follows from the well-known expansion that occurs when liquid crystal-like materials pass from a nematic liquid crystal-like state to an isotropic state. A plurality of layers is applied over the activated substrate surface layer.