This is a GR-13/15 Radial tube with a TR13 Offset rubber stem. Recommended application is for Radial or Bias Ply tires and the recommended tire fitment is for a 185/205R13/15 tire. Fits 185-205 width, 13-15 inch diameter tires. This radial tire inner tube has a TR13 rubber stem and the valve stem location is Offset. TR13 stem is rubber stem 1 1/2 inches tall, 3/8 inch in diameter. Actual item may differ from photo. Coker Tire Company features a huge selection of automotive tire tubes for collector vehicles. 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.