2012 honda cbf600sa sprocket /gearing change?

[hondacbf600sa]

hi guys,

I have a 2012 cbf600sa and want to change the rear sprocket to achieve better highway RPMs. I believe the stock setup is 16/42. I was thinking of going to a 39 on the rear. any input would be much appreciated.


Thank you.

[weasley]

Your engine speed will drop by about 8%, so if you were at 6,000 rpm before for a given speed, it will be just over 5,500 rpm after.

You may need a shorter chain if the adjustment available is not enough.

Your acceleration will not be as good, but your fuel economy should improve, unless you compensate for the drop in gearing by opening the throttle more everywhere.

What are you trying to achieve? Reduced noise? Reduced vibration? Improved economy?
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[Easy-X]

Basically more teeth on the front sprocket or less on the back sprocket reduces torque but increases speed.

Are you unhappy with the top speed in top gear? Are you willing to loose some bottom end in the chase for speed?

I don't know the bike personally but it doesn't look like something that would have any problem getting to 70. I hope you're not aiming to go over that speed on a public highway
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[P.]

Unless your bike is screaming itself to bits, there's really no point.

I sit at 70mph and its roughly 3000/3500 rpm, maybe a little less.

Considering its 13k rpm, 3k is fuck all. It doesn't really do much until 7k, so unless you are like... really revving its tits off, there shouldn't be a need to adjust.

[Easy-X]

That sounds about right. I'd have thought getting anal about sprockets is something more for a performance racer... or small 2-smoke bikes where it'd have much more impact.
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[hondacbf600sa]

thanks guys. Ya basically i want to reduce noise and vibration at highway speed so its a bit more relaxing. With the current setup at 60mph im doing about 46-4700 rpm. I understand for 600cc this is probably normal. im ok with losing a bit of bottom end, the thing goes like hell once the revvs come up, and im just looking to tour anyway.