I have remodeled the gears, and I have 3 variations.
The orginal gears had 12 teeth and 18 teeth. The hole radius on both was 10 units.
These gears have 18 teeth and 16 teeth with a hole radius of 15 units. The extruded part of the hole is 10 units across on both of them. My opinion, is they look almost the same size.
These gears have 18 teeth and 14 teeth with a hole radius of 15 units. The extruded part on the top gear is 5 units across, and the extruded part on the bottom gear is 10 units across.
These gears are also 18 teeth and 14 teeth, but the hole sizes are different. The top gear has a hole radius of 10 units while the bottom gear has a hole radius of 15 units. The extruded part of the gear on both is 10 units across.
Which set do you think will be more pleasing to the eye?