Vortex Racing has been manufacturing championship winning sprockets since 1995. Their race proven CNC machined aluminum sprockets are made from the highest strength 7075 aircraft grade aluminum and have become the industry standard for light weight, high strength sprockets.
Vortex 415 rear sprockets are available in 7075 high strength aircraft grade aluminum. Aluminum sprockets are lighter weight and preferred when performance counts. Read here about improving handling and horsepower by removing unsprung rotating mass from a motorcycle.
Aluminum Vortex 415 sprockets are available in F5 Hardcoat. The F5 PTFE Black Hardcoat is built for endurance. After type 3 hard anodizing with a jet black dye, they then coat the sprocket with PTFE (Teflon type material) for added lubricity. The result is an ultra tough, ultra light sprocket that stays cleaner and lasts longer than standard type 2 anodize.
Kawasaki Ninja 400 Recommendations:
18T/53T is close to the stock gear ratio for the Kawasaki Ninja 400 (stock 14T/41T).
If you are mid pack and still getting faster, I recommend starting with a 54T or 55T rear sprocket which work well for most tracks and most rear tire sizes. If you are already near podium pace, I recommend starting with a 52T or 53T at tracks with more flow and smaller straights like Buttonwillow or Chuckwalla Valley Raceway, or 50T or 51T for higher speed tracks with longer straights like Daytona or Road America.
Yamaha R3 Recommendations:
18t/55t and 18t/56 are close to the stock gear ratio for the Yamaha R3 (stock 14/43 gearing). 57T and 58T will give you excellent drive off the corners and great starts and work well with a lot of tracks.
If you are mid pack and still getting faster, I recommend starting with a 57T or 58T rear sprocket which work well for most tracks and most rear tire sizes. If you are already at podium pace, I recommend starting with a 56T or 57T. Then make changes up or down from there as necessary. If your track has a really long straight away with high speeds like Daytona or Road America, start with a 54T or 55T.
Available in 54t, 55t, 56t, 57t, 58t, and 59t rear sprocket sizes.
*Superlite 415 rear sprockets are slightly thinner at the mounting area than 520 sprockets and some other 415 sprockets and may require washers with some aftermarket sprocket studs.
When using an 18t front sprocket, use the following as a guide for chain length:
54t – 142 links
55t – 142 links
56t – 142 or 144 links (chain adjuster is all the way back with 144 links)
57t – 144 links
58t – 144 links
59t – 144 links
Changing from a 520 size chain and sprockets to a 415 chain and sprockets on the R3 makes a significant performance improvement.
I specifically dyno tested this upgrade to prove the difference. These 2 dyno runs are done back to back (about 20 minutes apart, as fast as I could pull the wheel and change the chain and sprockets) with the same bike, settings, dyno, tune, everything identical, and in the middle of the day after lots of other runs so the bike and dyno are hot. These are each the best of 5 runs to be sure everything was even. You can clearly see that the 415 kit improved power to the ground considerably at the top end. Peak power increased by .62 hp and torque by .29 ft lbs and improved performance across the entire power band.