Speed Restrictions

[thewaterbear1]

Hey everyone,

so after a ton a of deliberation i finally settled on a ebike off amazon, one that was specifically advertrised as capable of going 37+ mph. It has two 750w motors. I thought, great, this should move me, especially since I'm 240 lbs. Anyways, this bike accelerates decently to about 17 mph, than gradually climbs another 2 or 3 mph. I live in an area where theres plenty of car free riding, and id love to be able to actually ride this thing. I could pedal faster than the motors move. I downloaded the Bafang configuration tool and through that interface it woudnt allow me exceed the set limitation of 25 KMH. Through the display interface i could access the SP menu, but any changes I thought I made did nothing.



Any recommendations are greatly appreciated. Thanks!

 

[E-HP]

You can usually return an item to Amazon if it can’t perform as described in the listing.

 

[Chalo]

My rough calculation suggests you'd need 2300W at the wheel to hold 37 mph on a flat surface. That assumes a regular bike rather than some fat tire rolling roadblock that wrestles itself into submission, like most mail order e-bikes seem to be these days.

If the motors have an unloaded speed at least 37 mph, then they'll contribute some power up to that speed. But you'd need a downhill or a major tailwind to get there. To maintain 37 mph on level ground in still air, you'll need that almost 2-1/2 kilowatts at 37 mph (keeping in mind that electric motor power diminishes as RPMs rise above about 50% of the unloaded speed).

The seller wasn't being straightforward about the bike's performance, and your expectations of it were not realistic.

Cyclists have been sharing the road at regular sub-15 mph average speed since before cars were a thing, and continuously up to now. You don't need a bicycle that moves like a motorcycle, and you definitely do not need some dismal little non-DOT rated poofy tire scooter that goes that fast either.

 

[Zambam]

Please post the link of what you bought so no one else fall for it.

 

[2old]

I don't know whether this will provide anything different, but on many "cheaper" controllers the menu can be accessed by depressing the + & - PAS buttons simultaneously, then you can scroll through the options (metric, US units, top speed etc).

 

[docw009]

Bet you bought this two motor fatbike off amazon?

I own a 26" fat tire bike I rarely ride, but with 48V and a 25A controller and about 55 pounds. it's capable of 24-26 mph. So I would expect this bike to do 24 mph too, on one motor and a little more with both, and it does have 52V,

Maybe the battery isn't big enough to run a second motor. Maybe it's a dual 29A controller. It's a 1000 dollar ebike anyway.

 

[Chalo]

I own a 26" fat tire bike I rarely ride, but with 48V and a 25A controller and about 55 pounds. it's capable of 24-26 mph. So I would expect this bike to do 24 mph too, on one motor and a little more with both, and it does have 52V,

My guess is that there is either some CPSC Class 1/2 active speed restriction going on, or else the system is weak enough due to some power bottleneck that 20ish mph is all it can muster.

 

[docw009]

I assumed the speed restrictions on his bike were easily bypassed.

Mine is DIY. and has a KT controller with no restrictions other than physics,.

 

[E-HP]

Bet you bought this two motor fatbike off amazon?

It funny how many e-bikes on Amazon say 37MPH as the top speed. Some say 37.5MPH lol. Maybe they don’t feel like they’re lying as much, if everyone else is doing it.

 

[thewaterbear1]

Ok, thanks a little bit. For $1500 cost, tons of advertising as an offroad bike, beautifully designed...I certainly believe there is power at 48v and dual 750w motors to be able to accelerate and maintain beyond the high teens mph... in 2024. I see kids on 500w single motors flying by me. I want a real ebike, I have a road bike and mbt. I don't need pedal assist. I want electric power.

I am surprised that with the ability to develop software, such as the bafang configuration app, that easily modifying something like an ebike is so difficult. Especially with all you brilliant people here. Any help people. Secret menu? Expert settings mode? Advanced menu? Bypass code?

I will return if necessary but I like the bike. Does anyone have experience with dual bafang motors?

Thank you!

 

[marvin78]

Afaik the issue with Bafang is that they switched to canbus and are not willing to share their tools with the DIY scene. That's what I read when I was still researching between bbs02 and tsdz2b, since I didn't went with Bafang I haven't really been following.

I do know some people have 'tricked' the system by placing the speedsensor on the crankset instead of the wheel. In theory this should extend the range where the motors would assist you, at the expense of not having a real speed measurement on your display.

 

[E-HP]

I will return if necessary but I like the bike. Does anyone have experience with dual bafang motors?

Return it while you still can. Spending $1500 on an e-bike that doesn’t prerform as advertised is a ripoff. No matter what you do, don’t spend another penny on it. You could build an e-bike for less and have twice the performance.

I am surprised that with the ability to develop software, such as the bafang configuration app, that easily modifying something like an ebike is so difficult. Especially with all you brilliant people here. Any help people. Secret menu? Expert settings mode? Advanced menu? Bypass code?

Expertise on this forum is on DIY builds, so platitudes are wasted here. With DIY, you don’t need to deal with the crappy factory restrictions and you choose the right components to meet the builder’s requirements. Maybe check Reddit or some other place to get tweaks and codes from people that got suckered into buying the same bike.