Introducing PKT's "NEW" 25mm, 30mm and 1-1/4" rear wheel hubs. These are the narrowest and lightest in the industry. At just 30mm long, these hubs are CNC machined from high quality aircraft aluminum, with a black anodized finish and laser engraved. Metric zinc plated hardware standard. These are a must to free up a cadet, junior sportsman or kid kart. Sold individually.