Rear sprocket is wobbling

Robbie_D

Member
Hi,
Last year, i bought a DYAD, Banana Boss, Ebike. Bafang 500W motor, 48V, 17.5 aH battery

I bought the bike in August 2020, rode it through winter, and by March 2021, my rear sprocket was rocking back and forth badly. I brought it to the store and they replaced the sprocket (hub).
Now, it's October 2021, winter hasn't even started, and i see the "new" hub is starting to rock just a bit. I am sure by March 2022, i will need a new one again.
Does this sound normal, for an ebike?

I'm 60 and have been riding my regular bikes for many years in all seasons and i never had to replace a hub twice in one year. Are ebikes "cheaper" somehow?
Mind you, i like the design of my ebike, but the parts they use seem like pure crap. And the bike is from Taiwan, and sold in my city by a Chinese guy who seems to be in charge of all the stores in my "area"
I brought my bike to DYAD for repairs because the electrical system stopped working on me, while on the road. Thankfully, i was not far from the store, when the repair guy (a French guy from France) did the repairs, he broke the plastic part where the cables connect to the battery, and he denied doing it, and the store owner sided with his guy. I will need to buy that piece now that holds the battery in place - he broke off the part where the prongs connect on the battery when it fits into the holder. Now two prongs are exposed to the elements because he broke off half of the piece that protects the prongs. I will have to make something to cover it.
I'm not to pleased and don't really want them servicing my ebike any more.

So, anyway, are ebike rear sprockets more susceptible to wear and need to be changed once per year?
Or should i ask another store to sell me a better quality sprocket?

The ebike does get used daily to go distances of at least 12 Km (about 7.5 miles).
Thanks.
 
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Robbie_D

Member
Am i able to buy a similarly powered e-motored wheel from another ebike company and use it on my bike?
Maybe i am better off just replacing the whole back wheel from a better company - just to feel more certain?
Or are they all using the same wheels. The motor is Bafang but i am sure that can fit into any rim from any company, right. Maybe the rim is cheap or maybe the rim and the sprockets are cheap from DYAD. I can't say due to lack of e-bike experience. That's why i'm asking.
Thanks.
 

AHicks

Well-Known Member
Region
USA
City
Snow Bird - Summer S.E. Michigan, Winter Gulf Coast North Central Fl.
You don't mention how many miles you are running in this time period. I know there are some people that can really pile the miles on in short order. It would only stand to reason these people are going to consume drive train parts much more quickly than some others.

The Bafang rear hubs are USUALLY equipped with screw on freewheel rear gear clusters. These are not the greatest designs to start with IMHO. The issue is the outer 2-3 gears (example: 5th, 6th and 7th in a 7 speed arrangement) are not well supported with bearings. The single bearing that supports the entire cluster is located closer to the bigger gears located on the inside, closest to the motor. The result is if the bike is ridden most frequently using the higher gears that gear cluster is being twisted pretty hard most of the time it's being ridden. That single inside bearing is not tolerating that very well. When it starts wearing badly, you'll see slop in the gear cluster you are mentioning.

The solution may be to add a couple of teeth to your front ring gear. This will allow the chain to run closer to the center of the gear cluster to maintain the same speed and effort it takes to pedal the bike now. The front/ring gears are relatively inexpensive, and installing one slightly bigger should result in the back one lasting quite a bit longer....
 

rich c

Well-Known Member
By hub and rear sprocket I have to assume it's a freewheel? Not at all uncommon for cheap Chinese components. Do a search on here, you'll see this comes up fairly often.
 

AHicks

Well-Known Member
Region
USA
City
Snow Bird - Summer S.E. Michigan, Winter Gulf Coast North Central Fl.
By hub and rear sprocket I have to assume it's a freewheel? Not at all uncommon for cheap Chinese components. Do a search on here, you'll see this comes up fairly often.
Thank you for sharing that piece of wisdom. Very helpful.