The 40mm Go Kart Rear Axle Hubs Freeline is a high-quality, durable part designed specifically for recreational go-karts. Made by the brand Freeline, these wheels are essential components for maintaining and improving the performance of your go-kart. Perfect for outdoor sports enthusiasts looking to upgrade or repair their vehicle, these sporty accessories are a must-have for anyone looking to enhance. their go-kart experience. These originally sold for over $100. Near mint condition. No lug nuts. Metric.