Hello! What about 42t rear, like the Z300 and the ninja 300, both with exactly same mechanical group of Versys 300?Not sure what year of your bike, but the stock gearing on a first generation was 15/46 resulting in a 3.06 ratio. Your 15/43 results in a 2.86 ratio. In most cases that would result in something in the range of 500 rpm difference with the bike travelling at the same speed with the respective gearing..That's why I was asking the questions I did. I'm no expert on a dyno run, but the gearing change would result in the torque curve coming in later, related to the speed over ground and the bike would tend to be slower off the mark. You might get more top end in theory, but overcoming the wind etc, will not allow the bike to pull max rpm in 6th gear, if it would even do it on a stock bike. You will get more top end in real world driving out of a bike that is geared slightly lower. Stock gearing is always going to be a compromise. Glad your setup does what you want it to do.