Questions You Should Know about 8000w electric motorcycle

26 May.,2025

 

Questions on a w 72v ebike kit was - Endless Sphere

wturd

1 µW
Joined
Mar 23,
Messages
1
  • Mar 23,
  • #1
Would like to know the top speed of a w 72v ebike kit with bluetooth from madeinChina. Com I will be getting the 19in rim it's a hub moter and I'll be putting it on a haro bmx bike with 14mm axles in hoping it goes at least 70 mph and has crazy acceleration it's the cheapest kit I can find with the highest watts I will be using drill batterys from harbor freight a couple electric lawnmower batteries that are 52 volts each and 4 amp HR any ideas on a better faster build
  • Mar 23,
  • #2
Google: endless sphere + death bike

https://endless-sphere.com/forums/viewtopic.php?t=
Brake will be dirtbike based this time rather than the Hayse stroker ace downhill brakes on 8.5" rotors that I used last time, which faded something awful at the death race, and regularly boil and warp rotors on the pink bike.

Doc and Luke's Death-Bike!!
https://endless-sphere.com/forums/viewtopic.php?t=

Death Bike vs. Tesla Model S P85
https://endless-sphere.com/forums/viewtopic.php?f=6&t=

markz

100 TW
Joined
Jan 9,
Messages
12,179
Location
Canada and the USA
  • Mar 25,
  • #3
You need to find the kv of the motor, rpm/volt to find out the speed of the setup.

https://ebikes.ca/tools/simulator.html
There are other motors if you click all, you can also change the parameters of the motor.



wturd said: Would like to know the top speed of a w 72v ebike kit with bluetooth from madeinChina. Com I will be getting the 19in rim it's a hub moter and I'll be putting it on a haro bmx bike with 14mm axles in hoping it goes at least 70 mph and has crazy acceleration it's the cheapest kit I can find with the highest watts I will be using drill batterys from harbor freight a couple electric lawnmower batteries that are 52 volts each and 4 amp HR any ideas on a better faster build

fatty

10 kW
Joined
Nov 14,
Messages
672
Location
USA
  • Mar 26,
  • #4
Battery pack voltage * motor kV = max RPM

rim diameter + (tire diameter * 2) * pi = tire circumference (mm)

max RPM * tire circumference * 60 = mm/h

mm/h * 0.mi/mm = MPH

dogman dan

1 PW
Joined
May 17,
Messages
36,380
Location
Las Cruces New Mexico USA

fatty

10 kW
Joined
Nov 14,
Messages
672
Location
USA
  • Mar 27,
  • #6
wturd said: Would like to know the top speed of a w 72v ebike kit with bluetooth from madeinChina...I will be using drill batterys from harbor freight a couple electric lawnmower batteries that are 52 volts each and 4 amp HR any ideas on a better faster build

Nobody else was up for giving "8kw on Harbor Freight drill batteries" a reality check?

dogman dan

1 PW
Joined
May 17,
Messages
36,380
Location
Las Cruces New Mexico USA
  • Mar 28,
  • #7
Part of what I was asking. Rephrased, is this for a 1/4 mile ride, or a street ride?

Yeah, gonna need to parallel a lot of those batteries to go far at 70 mph. Nothing inherently wrong with running a bike on drill batteries, or mower batteries, but at 70 mph, you do drain em fast.

This vanishing range with increasing speed is part of why I went back to gas. BMW that goes 120 mph, and cost less than some of my e bikes did. At the moment, my only EV is a lawnmower.

The other reason of course, was that e bike that burned my house. He IS on the right track to plan on using as safe a battery as possible. When my wh pile of cheap cells went up, it was a really big fire in my garage.
  • Mar 28,
  • #8
dogman dan said: ......BMW that goes 120 mph.......


Your dogs must be in great shape by now to run that fast.....

:lol:

dogman dan

1 PW
Joined
May 17,
Messages
36,380
Location
Las Cruces New Mexico USA
  • Mar 29,
  • #9
Dogs are getting real old now. They run about half the yard, then check up and go ouch.

I got more healthy, and started riding scooters for my higher speed riding thrills. Finally strong enough for a really long ride. Today, since my last battery died, I am back to pedaling a bike every day to keep the health improving. But at pedal speed, 4 miles is plenty to get the clots out of the legs, and snot out of the sinuses. I'm still a dedicated bike guy.

The scooter was a large one, and did 80 mph easy, but I wanted the next size up to be able to pass semi trucks on I 10 better. In that wind buffet, you want to get the pass done quick. Kept looking for a good deal on one, but instead found the BMW for $. Cheaper than what I put into long range cargo bikes with wh of battery. It handles the highway so good, I almost doubled the length of rides I go for, along with just getting a bit stronger each year as I get over my long hauler west nile virus.

Its been great social distancing this year. No way covid catches up with me at 75 mph. And when the semis started going 80 mph last spring, I could still pass em easy, at 100 or so. Then slow down when I have a bit of space around me.

Most recently, Joe Biden bought me a 250 Yamaha dual sport motorcycle. That's what I ride dirt on now. After the daily pedal ride for health of course. I figured it was my patriotic duty to stimulate the economy immediately with that check.

My general advice still remains, get a motorcycle to go 70 mph. But 40 mph and under, an e bike is sweet!

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