Dr. Pulley Clutch HiT for Vespa GTS 200/250/300 SPECIFICATIONS: Inner Diameter (bell): 134mm Overall Height (bell): 51mm Number of Splines (clutch bell): 21 Clutch Center Opening: 36mm (width), 32.5mm (height) 50 Degree Pillow Springs Includes 3 sets of Pillow Springs and 3 sets of Clutch Springs for fine tuning COMPATIBILITY: Aprilia – Atlantic 200, Scarabeo 250 Vespa – GT200/GT250/GT300 Piaggio – MP3 250 The Dr. Pulley HiT Clutch with 50 degree pillow springs is for use on scooters with a modified cylinder requiring the clutch to engage at a higher RPM. Results from using this clutch include decreased slippage and improved transmission efficiency. **