Topic Tag


GT650 Front Sprocket Change?

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,



Rear sprocket

I bought a new front and rear sprocket. Can someone please tell me what size the 6 nuts and 6bolts are holding rear sprocket on? Also what size bolt (need to buy sockets) is holding on front sprocket on 2017 GD250r thanks in advance