Don't go lower than 14! You should only increase the rear sprocket!
If you want to go to that kind of ratio.. you should go to either 14/49 or 14/48
Don't go on the cheap side because you will have alot more troubles with other parts of your bike!
firstly you will completely waste the swingarm protector/slider in very few hundred kilometers, than comes the swingarm and by the time you figure it out you'll need a swingarm protector, chain rollers etc etc etc..
But anyway, do as you wish and...Good luck!
Vando
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