ZT-Tuning Performance Conversion Kit for Disc Brake Conversion S51, S70 Based on the original Simson Fork for Disc Brake, we have now developed our own fork with optimized damping and suspension. The damper has been completely revised internally, with the bore cross-sections for rebound and compression damping adjusted and a hydraulic end stop added. These measures achieve very good damping characteristics while maintaining high riding comfort, and the bottoming out of the fork is completely prevented. Another highlight is the extremely easy and quick adjustability of the spring preload using a preload sleeve. The fork can be easily opened from the top (in the installed condition), and the preload sleeve can be removed, allowing for a longer or shorter sleeve to be installed to adjust the preload. This way, each rider can adjust the fork according to their weight or desired stiffness. The fork is filled with a very thin oil in its delivery state to achieve a good compromise between comfort and damping. For racing use, a slightly thicker oil can be chosen, and the preload sleeve can be selected to be a bit longer if necessary. With these measures, the fork is also absolutely suitable for racetracks. Features: - optimized damping and suspension - spring preload adjustable via length of the preload sleeve - mount for Simson brake caliper (Grimeca) - easy to open - spring travel approx. 125mm - total length approx. 71cm - Performance 2-Piston Brake Caliper - hand brake pump for Simson throttle grip, starter cable anchor (choke) and brake light switch can be reused - brake pump, line and brake caliper are already filled and bled. Delivery includes: - right fork leg (short version) - left fork leg (short version) - bellows right and left - ZT-Tuning brake pump for Simson throttle grip - ZT-Tuning brake disc 260mm - ZT-Tuning brake line (length approx. 80cm, also suitable for Enduro) - ZT-Tuning Performance 2-Piston Brake Caliper for 260mm brake disc - 2 spacer bushings (the standard S51 axle can be reused) - discs, screws & nuts for proper fastening - parts certificate for conversion kit front axle to disc brake (fork, hand brake pump, brake caliper with adapter plate, brake disc)