Speedometer Gear Questions...

[MrSony]

We are not on the same page. When I pop a 17 tooth drive gear into the formula I get a 39 tooth driven gear. When I pop a 45 tooth driven gear in I get a 19 tooth drive gear. How do you get 17/45? I used 1000 rpm, 26.10" tire, 3:42 gears. Also I see only housings that go to a 43 tooth gear. Will a 45 fit? I don't know.

Using TCI's calculator. 17 tooth drive gear gives me a 44.88 tooth driven.
http://www.tciauto.com/tc/speedometer-gear-calculator/
There are 2 housings, 39 and below and 40-45. That ebay link I put for the 17-45 has the housing as well.

 

[Bonnewagon]

And that calculator doesn't work at all for me. I get NaN in the box. Oh well.

 

[MrSony]

And that calculator doesn't work at all for me. I get NaN in the box. Oh well.

# of Drive Gear Teeth 17____________ # of Driven Teeth 44.8810775431465 (45)
# Axle Ratio 3.42
# Tire Diameter 26.10