The RFX Pro UHD Rear Inner Tube (2.5mm/TR4) 425/450-19 is a high-quality inner tube designed specifically for motocross bikes. It is compatible with rear wheels that have a tyre size of 425/450-19.

This inner tube is constructed from ultra-heavy-duty materials, making it extremely durable and resistant to punctures and abrasions. The 2.5mm thickness of the tube wall also provides added protection against pinch flats and other types of damage.

The TR4 valve stem is designed to fit most standard valve stems, making it easy to install and inflate. This inner tube is an excellent choice for riders who demand the highest level of performance and durability from their motocross gear.

Overall, the RFX Pro UHD Rear Inner Tube (2.5mm/TR4) 425/450-19 is a top-of-the-line product that offers unbeatable performance, durability, and protection for serious motocross riders.