Designed exclusively for racing use, our Grand-Prix Series chains, are the culmination of the vast experience Regina has collected in motorcycle competitions. Available in seven different types, non sealed and Z-ring for high performance applications.  Road racing: GP3 for 125cc, GPMV for 250cc and GPSV for higher capacities. Motocross/ Motard: GPXV. Supersport: GPZN. Enduro: GPZN. Superbike: GPZ.