***Update 6-3-24, The Decha HR camshaft has been added as an option. It provides the same gains as a TB or DCR R2 but with a different lobe design that is not as noisy due to a larger base circle diameter. ***If you already own an afterma...
Reviews
4.8
245 ratings
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Wow
Seriously impressive upgrade for the Grom but without going big bore or oil cooler etc. Don't think on it too hard, just buy it and thank me later. Pulls hard now from about 5500rpm. Incredible
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David · 10 days ago
Good upgrade
Gets my 270 lb self to 60 mph on flat surface, id drop a tooth on the front sprocket as well
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Anthony · July 10, 2026
Fantastic upgrade waymore hp
This makes your grom way faster and makes it feel way quicker night and day difference from stock Great upgrade everyone with a grom should do.