30th-Apr-25, 06:06 AM
This is my crib sheet for pinion diameter versus tooth count
Ideal pinion diameters for 05 modulus
5.5mm 9 tooth
6mm 10 tooth
6.5 mm 11tooth
7mm 12 tooth
7.5mm 13 tooth
8mm 14 tooth
When putting cars together, I try to stay as close to this as possible.
I'll use a stretched pinion (fewer teeth than ideal)
rather than a squeezed pinion (more teeth than ideal) if I have to.
Ideal pinion diameters for 05 modulus
5.5mm 9 tooth
6mm 10 tooth
6.5 mm 11tooth
7mm 12 tooth
7.5mm 13 tooth
8mm 14 tooth
When putting cars together, I try to stay as close to this as possible.
I'll use a stretched pinion (fewer teeth than ideal)
rather than a squeezed pinion (more teeth than ideal) if I have to.