Thunder Innovation 4-shoe Pro One clutch system

Thunder Innovation have introduced their new 4-shoe Pro One clutch system which provides ultimate performance, great tunability and flexibility as well as ease of assembly and long lifespan. The shoe design provides much more contact with the bell and there are three types of flywheel for different track conditions. The light aluminium version is used on high traction surfaces and to provide a little extra bottom end snap from your engine. The medium & heavy versions are used to tune for low traction surfaces, as well as to smooth out low RPM power delivery on engines that have a strong bottom end hit.

Source: Thunder Innovation [thunderinnovation.com]