cobra69

Gear Ratio Calculation....
This is for a 34x10 fourth gear

x = multiply
/ = divide

Gear one (on the axle shaft) makes one revolution, and has 42 teeth

1x42=42

it engages gear #2 on the 16 tooth gear

42/16=2.625 revolutions

the 42 tooth part of #2 also makes 2.625 revolutions

2.625x42=110.25

and it engages the 12 tooth gear on #3

110.25/12=9.1875 revolutions

the 47 tooth gear makes the same 9.1875 revolutions

9.1875x47=431.8125
.................................................. .................................................. ............

and engages the 10 tooth on gear 4

431.8125/10=43.18125 revolutions

the 34 tooth part makes 43.18125 revolutions

43.18125x34=1468.1625

and engages the 8 tooth pinion

1468.1625/8=183.5203125 revolutions
which rounded up would be a 184 to 1 final drive ratio

Everything above the dotted line is the calculations for the 3 stock NB gears.
So, you can start with 431.8125 and use the tooth count on your 4th gear & pinion gear
to determine your final drive ratio .

SavedONE

-wow, you sure made that easy, makes me want to build one!!! You should Sticky that math!!! Thanks.

Spiike

Okay so my gears are as follows

42 axle -> 16
42 -> 12
47 -> 12
47 -> 10 (motor)

continue'ing after cobra's calculations. of the 3rd gear.

431.8125/12=35.984375

35.984375x47=1691.265625

1691.265625/10= 169.1265625

SO that being said, many thanks to cobra. I have a final gear ratio of 169 to 1

cobra69

Great Spiike,Glad it was of help to ya[8D]

Spiike

Yeah I just needed the forumula, I didn't quite understand other peoples posts