[18670] Helical gears - upgrade set

18670 This upgrade set gives you the possibility to set different gear ratios on your car, for a better set-up on each track.
The set consists of 3 small pinion gears:
Z1 - 18T
Z1 - 20T
Z3 - 17T

Different ratios are possible with this upgrade set.
All gears have 4 grubscrews to tighten them on the shaft.