This motorcycle inner tube set includes a front 80/100-21 and rear 100/90-19 straight valve TR4. It is compatible with section widths of 100 and 80, and has a thickness of 1.5 mm. The valve stem type is center metal valve and the material is butyl. This set is not a vintage part and is not compatible with universal fitment. It is a reliable and durable choice for your motorcycle.