ODO 20x29 - Odometer Gear 20x29 (KPH)

ODO 20x23 - Odometer Gear 20x23 (Kilometers Per Hour)
If the gear is crumbled and you can’t count the gears anymore, you need to count the partner gear. So the total number of teeth of the partner gear added with your crumbled gear should always be 70. So if your partner gear has 49 teeth, you need a new gear with 21 teeth.