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Your cart is empty.Made from Japanese SCM420 chromoly steel alloy. Heat treated and hand finished to meet or exceed OEM standards. Outlasts any mild steel or surface hardened sprocket. Each sprocket goes through 10 quality control checks before it leaves the factory. JT Sprockets are manufactured the right way – by hobbing, machining and drilling; this is the only proven way to achieve the closest of tolerances and the most accurate teeth profiles.
Brian
Reviewed in the United States on March 10, 2025
Works well on a 4 speed Grom to get you up to speed faster.
Paul R
Reviewed in the United States on February 28, 2025
I installed this on my Grom taking off my stock sprocket. It makes the wheelies so much easier. It bolts on exactly the same as OEM. Just be sure to not only torque it but use a start pattern as well.
Cluecheck
Reviewed in the United States on July 22, 2024
fit and works fine for replacing an old worn out sprocket.
Edward r.
Reviewed in the United States on December 17, 2024
Fits like a charm. Only thing is that it came in black instead of being the shiny silver, but cannot complain perfect
billy hyles
Reviewed in the United States on October 7, 2024
Exact fit. Fast shipping
Stefan Mastramico
Reviewed in the United States on April 26, 2024
It fit my 2019 grom and functions as expected at first. It is the correct size and tooth HOWEVER… I have put on about 600 miles half of that wheelies and it is already worn a u shape in the sprocket as you can see. Just enough for the chain to catch when rolling backward. Ver weak material. You get what you pay for.
Justin Conger
Reviewed in the United States on November 27, 2022
I ordered front (14t) and rear (37t) sprockets for my Grom, both from JT and I can tell you that it made a huge difference and I absolutely love them. I have GPS confirmed top speed of 60 mph with this fairly aggressive gearing and it rips! It is way more fun than stock at a slight loss of top speed. The sprockets are very well made and got to me in one day. I won’t hesitate to buy from JT again!
sully
Reviewed in the United States on March 29, 2020
had to dig around alot on amazon to find this but its exactly what your looking for if you in need of a grom sprocket. i can't say for earlier years but it fit no problem on my new 2020 grom with a 14t front on the stock chain power is great didnt have the chance to test it much as it was raining on install. don't let the photo in items description fool you it has the correct 4 bolt pattern to mount happy wheelies everyone!
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