SSP-G Performance Throttle - ChromeSSP G performance quick throttle in chrome for 50cc, 125cc and 150cc 2 stroke and 4 stroke scooters and more! A great option to convert ATVs with thumb throttles to a twist throttle! This throttle has a larger internal post with a shorter stroke or "pull". This gives the rider less distance to twist the throttle and allows for a quicker throttle response. Increased Throttle Response All Machined Polished Aluminum Construction Inner Diameter: 22. 5mm