Seeking gearing suggestions - NYST, NJMP NCBike - Yamaha R3 Forum
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post #1 of 2 Old 05-28-2019, 03:30 PM Thread Starter
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Seeking gearing suggestions - NYST, NJMP NCBike

After three trackdays this year (NCBike and NJMP Thunderbolt), my wife was commenting on top speed as well as mid-corner upshifts so I'm looking to replace the heavy and out-of-round OEM Sunstar 43 with alternate gearing to address these. Regarding top end, she was spinning around 11,200 at NCBike (2200ft straight after 2nd gear turn 11) and seemingly power limited at 11,400 rpms at Thunderbolt (at the end of the main straights (2000ft after 4th gear turn 12). Being that power peaks at 10,600-10,800 on her near stock R3 (K&N airfilter is only power upgrade), seems like there is more speed to be had with a smaller rear sprocket, say 42T. Similarly, she had struggled convincing herself to short shift two corners at Thunderbolt (i forget which corners) to avoid an up shift at full lean. Again, my thinking is swapping to a 42 rear may alleviate this. All that said, though, a fellow R3 rider with a Supersport level of prep was running 14/45, albeit with ECU reflash, full exhaust and raised rev limit.


First, any suggestions for the above situations? Bear in mind, she weighs sub-115 lb and therefore may not suffer lack of drive that most larger rider would. Secondly, the bike has a 112 link 520 chain on it so only options that work with that length are on the table (42-44 R).


Second, we're doing NY Safety Track in 2 weeks and never been there before. Considering the number of turns and elevation change, safet to assume a 44T rear would be the way to go?


Thanks
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post #2 of 2 Old Today, 04:50 PM Thread Starter
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Switched to a 44t rear and tried it at NJMP Thunderbolt and definitely felt it was the wrong way. Too many turns were demanding mid corner shifts. Will pick up a used cushdrive hub and set it up with a 42 next time.


At NYST, the 44 was an improvement but am tempted to try a 13/42 as it approximates the 14/45 while allowing the stock chain length.
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