Skidproof Wheel Unicycle Cycling Balance Exercise Tire is dual-function tire- skid-proof bulged-pattern outer tire and inner tire with butyl leakage protection. The adjustable seat height for different people & uses in hiking, cycling & much more. Quick release seat post clamp. Thickened aluminum alloy rim for better support. Steel fork with powder coated finish. Full-sized nylon pedals. Easy to assemble. Suitable for both novices and professionals, men and women. Free Delivery in the UK.