PKT's “NEW” 30mm rear wheel hub. These are the lightest and narrowest in the industry. At just 30mm long, these hubs are CNC machined from high quality aircraft aluminum, with a black anodized finish and laser engraving. Metric zinc plated hardware standard. Metric bolt pattern and wheel register only. These are a must to free up a cadet, junior sportsman or kid kart. Sold individually.