GT650 Front Sprocket Change?

[Kel]

Hey Gang,

I’ve recently acquired a 2006 GT650S which I’m currently working on.

The chain is in desperate need of replacement, but whilst I’m in there I’m considering dropping the front sprocket to a 14t to help with lower end torque/acceleration.

 

My research tells me that this reduces top speed (higher revs for given speed, therefore max speed at max revs would be lower) – My question is by how much and if it’s vastly noticible at the top end?

 

I primarily commute 50/50 on highways (110km/h – 70mph) and normal roads (60-80km/h -35-50mph)

Am I going to regret this modification if I rarely exceed 110km/h anyway? Could anyone who’s made this modification shed some light?

Stay Upright,

 

Kel

[Kel]

Looking at the screenshot below, what I’m proposing would only reduce the top speed by 6.7%

My understanding is that the top speed is around 180-200km/h stock, which with a 6.7% loss comes down to 165ishkm/h (far highter than I would ever ride on the road

 

Seems like a useful mod. Any thoughts or opinions welcome 🙂

 

[♠️ M77]

OEM is 15T , so having 14T , might take 10-15mph off the top speed , but bike will rev much higher as it gets through gears quicker.

I am guessing the accelaration needs mean the engine will have a better coolant (you want the piston heads to stay cool and radiator fans not on all the time) and good grade oil to keep that gearbox happy to go through gears faster ?

But do keep an eye on the engine temp bars from sprocket changes.

It really depends how far you go aswell, if you travel places more than 50miles away , you want the revs to be lower in cruising mode 🙂

[Author]

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