Bafang 750w hub geared + fixie gear

#1
Hi guys two questions if you don’t mind. Thanks a lot

1.Can the bafang 750w geared hub run with a fixed transmission?

2. Would it fit, maybe, with that just one pinion on the rear wheel into a normal bike frame?

Thats all. Again, many thanks for your attention

Regards.

Prescott
 
#7
Is it geared for your legs to keep up with the motor speed? Seems like you could hurt yourself if there is a throttle involved.
The motor can fail or battery get off ... it’s not bad to count with the B plan but I don’t really need 21 speed or some like that. Plus I can save money and weight My plan is use throttle mainly and that’s the most powerful geared hub in the market and heard geared are better for climbing but if you guys tell me a non geared 1000w at high voltage is equally powerful enough I take it in consideration as well
 

rich c

Well-Known Member
#8
My doubt is in your choice of using a fixie. There is no freewheel on a fixie. If the tire is moving, so are your legs. Most motors will take a bicycle up to 20+ mph. That's a lot of leg rpm if it's not gear right.
 

JRA

Well-Known Member
#9
It is possible to put a fixed cog on a thread on type motor, either DD or Geared and have at it. Not sure why one would but hey, I wouldn't but I am not going to stop you either.
 
#10
My doubt is in your choice of using a fixie. There is no freewheel on a fixie. If the tire is moving, so are your legs. Most motors will take a bicycle up to 20+ mph. That's a lot of leg rpm if it's not gear right.
Rich thanks for all the support you’re giving me

Take in mind I’m a casual biker so this questions even I do understand now what you say I didn’t think about it before it was all theory

The bike is going to be a city bike. I know a fat bike for city is like ... but I do a lot of climbing streets and geared hubs are supossed to be better and efficient for that. I don’t need speed I need torque and range. Maybe for climbing pedal would be helpful ? As I said is more a matter to count with the pedals in case that for some reason the motor or battery fail. Call it an emergency transmission if you want. I could put the pedals on a bag and mount them if necessary

Is posible to go with one pinion one plate without fixie?
 

rich c

Well-Known Member
#13
My first eBike was a Sondors fat bike, with a single speed freewheel. Bought it off Craigslist for $500 and put 1,700 miles on it. Damned thing is like riding a truck, but fun enough with power. No power, it's a killer. Miserable cranking away on a 60 pound bicycle with a single speed. You need monster legs to get it up any grade at all, and 2 miles without battery power feels like 20 miles. Just to prove the point, Sondors owners are constantly complaining about cranks coming loose and even stripping out the threads in the cranks at the pedal mounts. Cheap alloy cranks do not live long pedaling away on that heavy single speed bike! You have to constantly keep them torqued up since the aluminum moves from all the torque put on them. I only ride it now in the winter. I ride Haibikes and a tad pole recumbent eTrike now. For the life of me, when I roll out that Sondors, I can't imagine how I rode that damned thing 1,700 miles. Try and find a Sondors owner near you. Huge Sondors Facebook owners page, almost 8,000 members world wide. Amazing how many owners you can get when you sell the first bikes for $499 plus $200 shipping. On the used market they are way cheaper than building a bike. Easy to get a used one with a few upgrades for around $700. Even just ride one and see how brutal they are to ride without the battery.
 
#14
My first eBike was a Sondors fat bike.
Im currently living in Europe Rich don’t know if shipping cost may ruin the deal

But let’s talk about the bafang 750w ... is powerful and good enough motor?

I want to fit a very small battery running 48v and 13.6 ah ... it’s ok the motor with that amps?
 

harryS

Well-Known Member
#15
I see Prescott should review the bigger issues of single geared bikes. The Bafang 750W fatbike motor won't ever fit, but there are other big geared motors and non geared motors that will fit a mountain bike frame's 135mm width, I forgot that a true fixie spins with wheel. I was thinking he wanted a single speed freewheel. A fixie on an ebike sound dangerous. Probably easy to bust a shin and even break a leg with it .

And a single gear is silly too on a heavy bike. Sondors did it to get his price down. A cheap Shimano derailleur, shifter, and cable adds more than 10% to that price.

The motors on ebikes aren't that big, and if you want range, most people use them as assists. If you want to go all day without pedaling, you're looking at bigger batteries and bigger motors. Probably a scooter with a gas motor makes more sense as far as cost and versatility.
 

rich c

Well-Known Member
#17
Im currently living in Europe Rich don’t know if shipping cost may ruin the deal

But let’s talk about the bafang 750w ... is powerful and good enough motor?

I want to fit a very small battery running 48v and 13.6 ah ... it’s ok the motor with that amps?
There is no correct answer to powerful and good enough. It's a subjective question that will have a different answer from each person. 13.6ah is not much if you just use throttle only. Especially when you mention you need range. Now range to me is 40 miles, maybe it's 20 for you? You need to post on some European forums so you can find someone to let you ride before buying parts. Go to some dealers and do some demos. Then you will know what to buy for your city and your style of riding. These bikes aren't scooters. They don't accelerate and climb like a scooter until you get to some hot rod specs.
http://www.pedelecs.co.uk
https://endless-sphere.com/forums/viewforum.php?f=21
 
#18
There is no correct answer to powerful and good enough. It's a subjective question that will have a different answer from each person.
Mmmm ... not all. We have references. Miguel Indurain, the 5 times consecutively Tour de France champion puts about an equivalent of 500 Watts peak in his hour race record back in 95. That is 250w less (and motor has higher peaks than that!) plus let’s say I can put 75w by pedaling. And a pro racer like him is a beast able to climb 20kms between 10% 20% hills fast as he can. I don’t expect doing such efforts, not even close. So 750w at 48v and higher amps if needed is overkill for my daily routes. But since there’s minimal difference in price between 250w and 1000w in price ... if ...I go someday to unknown roads is good to have Indurain electric legs, you never know 😏