Stens 170-043 Tube Replaces Carlisle: 320260 u12:u31 Stem angle type: 90 degree/tr87 tube size: 13-5.00-6 (5.30-4.50-6, 14-6) Each tube is individually pre-aired and inspected utilizing advanced technology to ensure conformance to Japanese industrial standards specifications Only the highest quality butyl rubber and carbon black are used in the manufacturing process Advanced extrusion technology ensures consistency and eliminates thin walling problems common with other tubes