Need Help/advice For Gear Set Ratio..

Hi guys, im sorry if this topic has been discuss before..

Anw, i've been wanting to change my gear 4th set to either 21t or 20t but i can't decide which give smoother acc for topspeed/distance..



My setup,

Uma superhead

Uma 62mm block

Keihin PWK 28mm

Leo Vince sbk exhaust

Yamaha Thai non-cut off cdi

15-33 sprocket



So should i replace the stock gear 4th sprocket to 21t? Or better with 20t?

Any suggestion?

Im rinding Spark 135 (4 speed).



T.i.a



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