This is a ER10 145R10 tube with a TR13 rubber stem. This is a 10 inch inner tube for the popular little 145R10 radial tires. These 10 inch tubes have a common TR13 rubber stem, their valve stem location is Offset. Recommended application is for Radial or Bias Ply. Recommended tire fitment is for a 145R10 tire. Fits 145 width, 10 inch diameter tires. TR13 stem is rubber stem 1 1/2 inches tall, 3/8 inch in diameter. Actual item may differ from photo. Hartford brand tubes are built to meet our specifications using premium grade materials. They are designed specifically for their applications, to provide a high quality inner tube solution and reliable service life. These are excellent quality tubes, available in a wide range of sizes for collector and specialty vehicle applications.