Our new Superlite RS8-RR race series 415 aluminum rear sprockets are the lightest weight 415 sprockets available for the Yamaha R3 and Kawasaki Ninja 400. The 54T sprocket weighs only 7.7 oz and the 57T weighs only 9.0 oz. They are machined, not stamped, from the highest grade billet aluminum aerospace quality 7075-T651 and are hard anodized which dramatically reduces wear and increases durability.
Kawasaki Ninja 400 Recommendations:
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.