• Hello ES! We could use some help to get us past the finish line on building the new knowledgebase for the forum.
    Can you donate? Please see our fundraising page. Thank you!

72v 6kw Custom Build

Do your police really have nothing better to do? Over here the problem is the police do nothing until there are so many illegal ebikes going around you can't safely walk in some cities, at which point there is public outcry and then they sometimes do something. I'm being a little hyperbolic for comedy but not that much.
They were patrolling for a druggie who mugged a 80yr old women at knifepoint, just saw me following the traffic laws and thought that was a better use of there time i guess.
 
I am sorry for your loss man. All the work/time/money That's hard.
Did you have the fairing on when they came?
Yep.

Unrelated but when they pulled me the bike was in mode 2/3.
They span it up in the air and it read 79mph, if they changed it to mode 3 it would've set the record for the fasted modified ebike they've ever caught (150mph in air).
 
If something like that happened to me I'd be quite tempted to move to a different country. Completely inexplicable and unnecessary, cruel behavior that serves noone.
 
What are they doing with the bike anyway?
Separate the Parts and crush?
What happens to the battery? Recycling bin?
It's not that old after all.
Can you buy stuff back?

That spinning up in the air is pointless as well,
I guess even a 250w 25kph Bosch bike spins past 25 then
 
What are they doing with the bike anyway?
Separate the Parts and crush?
What happens to the battery? Recycling bin?
It's not that old after all.
Can you buy stuff back?

That spinning up in the air is pointless as well,
I guess even a 250w 25kph Bosch bike spins past 25 then
I think they recycle/sell the battery's but the rest just gets crushed.

It gets stored outside for 2 weeks before anything is done to it anyways and with the british weather that's basically a fair well in itself.

Buying stuff back depends on who the local police use. My local one doesn't but others auction bikes.

They spin the wheel in the air to check if it goes over 15.5mph.
(The legal limit in the UK)

Got 7 working days to make a claim against for the bike (Will attempt but highly unlikely it will be accepted) and 14 days till it gets "disposed of".
Even if the claim does get accepted, there is a "daily storage fee", for every day the bike has been in the yard £20 and a £150 collection fee.
 
I'm kind of impressed they speed test them. Most I've seen the police do here in the US is pace you in their cruiser. If you are going over 20mph without pedaling, they pull you over (max speed allowed on throttle). If you are going over 30mph, even with pedaling, they pull you over (max speed allowed on pedal assist).

Pegs instead of pedals and on the road without a license plate would likely be an instant pull over too. They'd just call it a dirt bike at that point. Although I admit I had a legal loophole 49cc scooter once that didn't seem to require a plate or a motorcycle driver's license. Not sure how to get into that category with an e-moped, though. It did have a VIN.

Enthusiast DIY ebikes will often go full speed in the air with little power applied. Production ebikes likely do have a speed sensor that should limit power at the max speed for legal reasons. There's actually some de-restricting devices that basically put the magnet for the speed sensor on a gear that spins slower than the wheel.
 
Making the controller shutdown in special cases should be easy(i have my display attached w/a
magnetic connector). And then the bike should never be "unlimited" when turning on==running
w/o custom firmware is risky. Playing by these rules is usually easy&safe no matter what they do,
as long as the controller is 100% under _your_ control.

Unfortunately above does ofc. only work w/ebikes that look like they might be legal.
 
My "1500w", 52V bike (30 amp controller, 39 mph no load, 30+ with a 180 pound rider) has a switch that instantly blocks levels 4 & 5 of the PAS and throttle. Obviously you also would need pedals, but isn't this feasible for other combinations? Picture prior to completion.
 

Attachments

  • IMG_5646.jpg
    IMG_5646.jpg
    2.8 MB · Views: 14
Maybe you could just make the bike disposable. Keep the battery and controller in a backpack and use a cheap tossed out bike share rear hub and free rusting donor bike. If they take the bike, so what.
 
The UK e-bike laws are so vague,
technically i can have a throttle as long as it requires me to pedal to use it.
There's nothing to say it needs to be entirely pedal assist, only that it requires pedalling to be propelled.

Official government website states:
Your bike is illegal if:
"does not have pedals that can propel it" (A chain solves this)
"it can be propelled without pedalling, for example, a ‘twist and go’" (requires pedalling for propulsion)

This means, as long as my pedals are spinning at any speed or gearing i wish, my bike can be throttle powered.

This loophole will be utilised in my next "legal" build and i will be carrying around obnoxiously large printed off copies of the regulations with even more obnoxious arrows and circles just to annoy any officer who decide to try.
 
I'd get a controller you can hack on, and have the "legal power on settings" be so, that
throttle is only for "walk/push assist" for some ridiculous speed limit like 5km/h.
 
I'd get a controller you can hack on, and have the "legal power on settings" be so, that
throttle is only for "walk/push assist" for some ridiculous speed limit like 5km/h.
Pretty sure that is still illegal, i'm probably going to use a fardriver as i've had good experiences with them and have the whole harness from my seized bike as a spare.
I have a raspberry pi zero 2w that i'm using for my custom dashboard and i'm sure i can get that to control the throttle power based on the PAS readings.


I looked into battery building and it seems cheaper to buy a premade one rather than building myself. Anyone got tips for keeping costs down on battery builds?
 
it seems cheaper to buy a premade one rather than building myself
It also makes it much easier to burn your house down. The cheapest premade options are unsafe, period. If you want a cheap battery, then the best option is to source cheap cells (de-packeted, rejects etc.) and build one yourself.
 
Or if you have the space for it, a used large-EV battery module from places like GreenTecAuto. Some of them are very cheap for what they are.

At least the cells and construction of them is highly likely to be at least an order of magnitude better than any cheap battery, and probably also that much better than something a DIYer will be able to build (until they are very experienced and have the right (not cheap) tools).
 
What do they do about overpowered but really expensive electric bicycles? Like there are gear hubs costs almost $1500 alone? Frame can be another $1000-$2000. Other components can be another $1000-$2000. Do they destroy all this nice expensive stuff? Maybe it makes sense to destroy only the controller because of this is the only thing controls the power and speed.

Thanks to ancestors for the Independence Day so we do not have such BS here.
 
Last edited:
What do they do about overpowered but really expensive electric bicycles? Like there are gear hubs costs almost $1500 alone? Frame can be another $1000-$2000. Other components can be another $1000-$2000. Do they destroy all this nice expensive stuff? Maybe it makes sense to destroy only the controller because of this is the only thing controls the power and speed.

Thanks to ancestors for the Independence Day so we do not have such BS here.
Id imagine they are still required by contract to crush them.

Surron frames, motors and controllers all get crushed in the same way.
 
Back
Top