When doing a big bore kit, you need gears. Without them you are never going to take advantage of the extra power. Choose whichever set fits your needs. I suggest going for taller gears, if you do alot of flat top speed riding, and shorter ones if you like acceleration, and stop/go.
15x42 is best for stock/mild 72 builds
16x42 is best for 72cc builds
17x40 is best for smaller cc stroker bikes
18x39 is best for large cc stroker bikes
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