depending in on how you use your serow. i use mine 95% street. i tooth more really makes a difference. i feel less vibration now since i dont have to push the engine to get to speed above 60kph. the bikes runs much much better. i felt the 1st to 2nd gear gap before was too far from each other and over all it was really geard too short for street use. i was always finding the the right gear. i can recommed this upgrade if you use your bike like i do. take note of the riders weight though. i am 80kilos. no problem on the hills that i use to pass thru with the 15 teeth OEM sprocket. No need to change the chain. i suggest you order a spare lock for the nut of the sproket. FYI this review was made after i tested the bike for about 60 km only, so far so good no regrets. recommended!!!
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