🔧 37 Tooth Steel Rear Sprocket by JT Sprockets - JTR212.37 Review

Used this on both my 2015 Thunder and 2014 Thunder with no problems. I liked one so much that I bought the other as well. 14/37 stuntmen.

Perfect fit for my 2017 Grom. He currently runs 14/37 in Colorado and is perfect for 2nd gear squats. Looks good and works well.

Had to do a lot of digging on Amazon to find this but it is exactly what you are looking for when you need a Grom sprocket. Can't say for previous years but it fitted my new 2020 Grom 14t front wheel drive on the stock chain with no problems, performance is great, didn't get a chance to test it as it was raining when fitted. Don't let the photo in the item description fool you, it has the correct 4 hole pattern for fitting lucky rims!

Quick assembly on site. I have 14t -1 of the 15t in the front and 37t in the rear. For every front tooth there are 3 molars, so I think that's 40 tons. I would recommend if you only use thunder for retarding or rear wheel to get a 40 tooth rear sprocket and up. It is very easy to deal with him, since Thunder is weak and too weak. Get about 60% springs and a stronger clutch disc. You are hired!