Bought both the 13 and 14 tooth to try out my 2019 Grom, having already added a full Yoshi exhaust and Dynojet tuner which were great upgrades but so good like nothing worked when it came to top parts, especially since I'm a bigger guy for grom 5-10, 260lbs. I then bought sprockets aimed primarily at improving the bottom end for pit bike shenanigans and I tried out the 14 tooth with excellent performance throughout the gear range and actually got about 5 mph more than normal on the top end which is about 52 with exhaust and tuner was. and then I switched to 13 teeth to find it was perfect and actually got another 5 mph to get to 63 while just tinkering next door. This is by far the best mod for Thunder and only costs a few dollars ππ
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