I can tell you this will NOT fit my 2019 Grom. The sprocket ID is fine, but there is not enough play for the teeth on the shaft. I contacted JT Sprockets and they confirmed this part should work but the one I received did not fit my bike. The JT252 is said to be oversized for a 2019 Grom shaft but fits mine perfectly (no play). So either two different parts are manufactured incorrectly (unlikely) or there is at least a 2019 Grom (mine) with larger gears on the shaft than expected.
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