Kids Ride On Upgrades and Mods to make the vehicle faster, more reliable & last longer on a charge

12v 550 40k rpm Gearboxes (Second set I had to get from eBay)
https://www.amazon.com/gp/product/B07DBCMWYN/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B07DBCMWYN&linkCode=as2&tag=amakerslife-20&linkId=ce421695c5d9ec910869509a9a14f66a

Electronics Box / Speed Controller
https://www.amazon.com/gp/product/B07FMM9X41/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B07FMM9X41&linkCode=as2&tag=amakerslife-20&linkId=c49f4d0d17aa9da2b9a519b1c0132acb

Gearbox & Battery Results

12 Volt Lead Acid
390 Motors = 86.6
550 Motors = 261.4

16 Volt Lithium
390 Motors = 118.6
550 Motors = 352

The Math to figure out the MPH can either be calculated base on wheel diameter x Pi (3.14) (measure across the wheel) or wheel circumference (measure around outside of wheel)
Divide result by 12
Divide 5280 (Feet in a Mile) by last result
Next divide RPM measured by last result for Mile per Minute
Multiply by 60 for Mile per Hour

Example
10 x 3.14 = 31.4
31.4 / 12 = 2.61
5280 / 2.61 = 2022
352 / 2022 = 0.174
0.174 x 60 = 10.44 MPH