After reading so many reviews on sprocket upgrades for my 2021 SSR125 I was skeptical on a 17T or 16T while hearing the 17T makes first gear much more usable and spread out but also since its taller the clutch can slip so I went with a new rear sprocket of higher quality in stock 37T size then installed this 16T front sprocket and its prefect. These SSR pitbikes dont need to sing the moon on RPMs but the 16T gives you that option to get that low end hookup and pulls out just far enough before its time to shift.