JT Sprockets JTR486.45 45T Steel Rear Sprocket

16 on the front, 45 on the rear (this sprocket) and it works well, no speedometer errors but it is not precise, at 130 km/h the GPS says i was going at 124 km/h, more than acceptable.

Solid choice for my 2004 Ninja 250, keeping the rear same as stock. I've put about 5,000 miles on it and still looks good. I'm probably buying this again when the time comes.

It's a motorcycle sprocket. After several thousand miles, the teeth are still square and pristine. Like new, even. And that's what you'd expect out of a sprocket at this price-point when your final-drive is maintained, cleaned, and lubricated on a regular basis.

I needed to replace the chains and sprockets on my 2011 Kawasaki Ninja 250 so I picked this up. Excellent sprocket for the price. Kind of heavy but the carbon steel will last a while. OEM fitment was perfect. No complaints about this sprocket.

I have never seen a sprocket wear out this fast

Great product

Perfect fit on a 2009 Kawasaki 250R. New sprockets and chain: feels like a new bike again

This is the exact replacement for the Ninja 250 Pregen. I bought it along with a new chain and front sprocket, however, I believe that it was really unnecessary. The front sprocket was really worn bad, but the rear didn't have hardly any wear. I would recommend changing the rear sprocket only every other chain. The front sprocket should be changed with every new chain.