FG Spur and Pinion gears from Motor to Layshaft

Have you ever wondered why the mesh on your truck, car or buggy is off.
Maybe the following will help explain this.
I have seen over and over people on the net telling you to go to Aluminum as the Plastic this and that is flexing
and this IS NOT THE CASE, as you will see in the pictures below. The sizes are different.

Type of Pinion and Spur Gear Inch Metric
FG True Metal
Pinion Outside Size      (32 grams)
Pinion Inside of Teeth
Spur Outside Size        (74 grams)
Spur Inside of Teeth
1.053
0.8085
2.945
2.691
26.75
20.54
74.82
68.38
FG Plastic Pinion
Pinion Outside of Teeth (10grams)
Pinion Inside of Teeth
Spur Outside Size        (62 grams)
Spur Inside of Teeth
1.067
0.802
2.9625
2.725
27.10
20.38
27.23
69.21
XTM (Marder Copy)
Pinion Outside Size      (38 grams)
Pinion Inside of Teeth
Spur Outside Size      (104 grams)
Spur Inside of Teeth
1.0585
0.822
2.9535
2.731
26.89
20.89
75.02
69.37

(Click on pictures below to see more detail 640x480)
FG Metal Pinion Gear and Metal Spur Gear on CrazyNut Adapter

True FG Stock Plastic Pinion and Spur Gear

XTM (Marder Copy) Metal Pinion Gear and Metal Pinion Gear on CrazyNut Adapter
Spur Gear needs to be Machined out to fit on the adapter like the FG, and why it is heavier

XTM Metal Pinion Gear and FG Metal Spur Gear on CrazyNut Adapter
This is about the best Mesh of all of them

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