This 300mm dinghy wheel has an internal air filled inner tube surrounded by a chunky solid rubber tire. This particular 20mm bore sized pneumatic wheel features a diamond pattern thread and has a ball journal bearing. With a load capacity of 150kg these tyres are suitable for low speed applications such as wheelbarrows or launching trolleys.*PLEASE NOTE TYRE SIZE DIAMETERS CAN VARY DRAMATICALLY BETWEEN MANUFACTURERS AS PLUS OR MINUS 25mm*** BORE SIZE IS TO SUIT 3/4 SHAFT RATHER THAN 20mm ** 280mm Pneumatic Wheels with Ball Journal Bearings