Ask an ebike technical question get an answer within 30 minutes or so.

[Kirwan Fox]

Hello. What is the size of the sprocket which comes with the BBSHD hub motor kit by default? I counted 48T in the product photo. Is that correct? I have a 38T on there now and there is tons of space to the chainstays. I hope I never have to pedal this bike with a dead battery, and I doubt i could pedal in 1st gear with a 48T sprocket.

[Kirwan Fox]

I'm not sure if this is the right place for this question. Sales tax was added to my cart, even with an Oregon shipping address. We don't pay sales tax. Can you find a way to take that off my order total, or direct me to someone who can? Thanks.

[HIGHVOLTAGE]

It will be removed after entering your billing & address details during the final checkout. It's only included by default before you enter your address due to the website design limitations.

[Kirwan Fox]

Thank you!!

[Beefy]

The Luna Banana specs say that the frame is a Cost Cycle Ruckus, but that frame is not on the Coast Cycle website. It is very similar to the Buzzraw model. Are the Ruckus and the Buzzraw the same thing with different names?

[paxtana]

Yes, coast just renamed it.

[Joe Remi]

They probably got in trouble with Honda over the Ruckus name. The thing even kinda looks like a Honda Ruckus scooter, which I presume is why they named it that.

[Joeyb23]

Hey guys!

Doing my first build with a 1,000 watt rear hub motor. I’m 210 lbs with a ten mile round trip commute (no hills). Do you think the 52v Mighty Mini is an acceptable choice for my battery?

[HIGHVOLTAGE]

Yes, it should be generally fine. :)

[Coolo118]

My ebike was behaving wierdly when making the 14 mile commute home yesterday.

1. ) At about 40 volts the ebike felt a bit sluggish.

2.) After 9 miles into the trip back home from work the power would cut out briefly and then it would come back after a couple minutes. When the power did come back it would last for a couple seconds and it would be very weak.


Some more possibly relevant information :


I am using a 46t chainring.

A picture of the battery I got is attached below.

I am using the bbshd and carrying two panniers that weigh 40 lbs.

I weigh 190 lbs.

I charged the battery to 100 percent before leaving to work ( This is my 4/5 time charging it to 100 percent to balance the cells.)

My 14 mile commute to work was great. It was windy and there were several hills I had to climb and yet I got there in 32 min.

Shortly after the power would cut out I touched the battery and it was barely warm. I also touched the bbshd and it was barely warm as well.

[Joe Remi]

At 40 volts you're out of juice. 45 is about 20%; 47 is when you should be running at PAS 1, laying off the throttle and nurse that baby home. I learned this lesson the hard way, too...

[HIGHVOLTAGE]

Yeah, 40v is very low for a 52v battery. You're likely hitting the shut-off. Check this 52v Chart for reference:

https://electricbike.com/forum/filedata/fetch?id=46252&d=1521089057

[jimfullilove]

Is your luna charger compatible with/can charge a 48 V, 19.2 Ah battery?

[paxtana]

Yes if it is lithium ion and it is for that voltage and you have the correct plug

[DDUBB]

I have a Cannondale Los Dos II tandem that I want to add a mid drive or rear hub unit to it. I would like to know pros and cons of each and recommendations of what to buy. it has 26" wheels, bottom brkt measures 2 5/8 or 66.675 mm, two riders = 275lbs

[HIGHVOLTAGE]

Check the Hub Motor Documentation thread. Lots of good information in there. You mainly just need to check your dropout widths to see if they are between 100mm and 135mm depending on rear or front and voila! Bolt that sucker on, wire 'er up and you're good.

https://electricbike.com/forum/forum/knowledge-base/motors-and-kits/42968-how-to-pick-out-a-hubmotor-kit-for-your-bike-build

If you're looking for a Mid-Drive kit, you'll wanna check out these links and see if your bottom bracket meets the standard requirements.

https://electricbike.com/forum/forum/knowledge-base/motors-and-kits/bbshd/10736-how-to-order-the-right-bbsxx-kit

https://electricbike.com/forum/forum/knowledge-base/motors-and-kits/bbshd/10770-press-fit-eccentric-bottom-brackets-carbon-frame-and-bafang-mid-drive-kits

https://www.reddit.com/r/ebikes/wiki/bbs_faq (comprehensive list of tools needed here, very helpful)

The main thing you should know though is if your bottom bracket shell has threads on the inside, It pretty much means your style of bottom bracket will likely take the BBS motor without needing an adaptor. Threaded bottom bracket shells are called JIS or BSA standard and this is what the Bafang motor kit was designed to work with. The inside diameter of your JIS-BSA shell should be 33.8mm +/- .2mm. Make sure to check it. Twice if you have to.

[abnorm]

Was getting ready to purchase Apocalypse, but it just went out of stock. When are you expecting them to be back in stock or there is a new version on the horizon?

[HIGHVOLTAGE]

Since it just ran out of stock, there's no ETA right now. Check back in a week or two with us and we'll have a more accurate answer. I do believe there is a new version on the horizon though but nothing has been announced yet.

[Estella]

I think something is wrong with my speed control how do I go about getting a new one?

[HIGHVOLTAGE]

Going to need more details here. Speed control for what? Please make sure to provide us as much information as possible as we cannot make any assumptions about what you're referring to.

[DDUBB]

It’s been 3 hours since I posted questions maybe posted on the wrong page???

[HIGHVOLTAGE]

Things are just a bit chaotic and busy here. I'm just doing emails on the other side of things which is just as busy as here. Typically not all questions can be answered in 30minutes or less here, especially general questions like "What's the best recommended XXX for me" which require a bit of link gathering and information gathering to give you a decent answer and not something I can just quickly answer in a couple seconds. We try our best though. If you have something that I can answer in less than a few sentences, you'll probably get a response quicker.

I'll get to your post in a moment though :)

[MattB]

Just bought new Dunlop 70 / 100-19 tires for the Sur-ron and the knobs are a tiny bit wider than the stock tires. It looks like the Rear will clear perfectly but the front will likely touch the inner edge of the KILLA fork. Any ideas? If Dunlop 70 / 100-19 do not fit, what are my options?

Thanks!

Matt

[paxtana]

Use a fork that is more accomodating of a wider tire? The RST is a downhill fork, any other DH fork should work long as it has same specs.

[bigbill25]

I'm going to do a BBSHD kit for my Yuba Mundo cargo bike when the 68mm kits come back in stock. However, the internets tell me I need a speed sensor cable extension. I don't see those anywhere on you site. Possible to order through you? Also, with the long chain line on the Mundo, is the chain ring offset a big deal. I.E. would your Luna 40-tooth work fine for shifting all seven gears?
Thanks!
-Bill

[paxtana]

https://lunacycle.com/bafang-8-speedo-extension-cable/

Chainring offset is always a big deal, but possibly less so on a longer chain since the angle is less severe. Start with stock to get a feel for what you need, and refer to the offset guide for how the rings differ from stock.

[Joe Remi]

As Paxtana says, chainline isn't really a thing on a cargo bike. I did a BBSHD on a Bike Friday Haul-a-Day 8-speed and there's hardly any angle on the chain cuz the cassette is so far back there.

[jahuber]

Does the amperage rating of a charger matter, or does that battery management system decide what current to draw? Specifically, if charging a 36v 17Ah battery would there be a difference between using a 2amp vs a 5amp charger?

[HIGHVOLTAGE]

The BMS will not limit the current. There will be a large difference between a 2 amp and 5 amp charge,

[Coolo118]

For a 26ah 52v Panasonic GA battery and 350 lbs of weight to haul ( total weight of me plus bike ) what is the approximate range I can expect if I charged it to 100 percent and went 30mph on flat smooth surfaces with some minor elevation changes and no wind and no pedaling?

thanks

[HIGHVOLTAGE]

Range estimates are wild, chaotic and partially unpredictable. It can depend on how aggressive you ride, how much accelerating and stopping you do and the temperature outside. Generally speaking a 26ah battery will get you about 50 miles+ under good conditions.

[Valmek]

How do I adjust the cyclone motor freewheel??? I was told it can be adjusted and pushed in further which will fix my problem but I can't find anywhere how to adjust it. There's a screw that takes an allen wrench but it won't do anything.

[paxtana]

If you refer to my last answer on this thread it included pictures of what you need to do.
You have the placement of the tensioner roughly correct but the alignment is off. Look at the install resources on the documentation KB, specifically the link from Karl which goes over this.

You could even physically bend the arm of the tensioner into alignment with some channel locks if you had to, long as you could hold it in a vise first. Anyway if you sight down the sprockets looking at them edge-on, it should be a straight line. If not, this is your problem.

[Valmek]

I need to know about the freewheel on the motor not the tensioner. The freewheel needs to be moved, I know it can but I have no idea how. The tensioner isn't the problem, I did exactly what you said and it still comes off because from the motor to the chainset isn't aligned and I need to move the motor freewheel back. It's not straight there is a curve which is why I need to know how to do this not the tensioner why I'm asking about the motor freewheel not the tensioner this time. I'm so over this bike not being able to work, spending so much time and money trying to fix it, it's obviously not worth it if I knew all this trouble but I'm already invested SO much money I don't have I might as well try to go broke to fix this.

[paxtana]

Can you take a picture from the side to show this? Maybe some close-up pictures around the area?

[Acs1krr]

Help My Battery isnt charging. Battery got soaked on yesterday's ride now it wont charge. I checked all ports and everything seems ok.. Correct voltage shows in voltmeter for all leads. The battery is a soft pack 52V 17.5 amp that has about 2500 miles on it. I have done the test to check if battery will charge through discharge XT90 ports and it does however xt60 ports have correct voltage showing but still wont charge. I suspect BMS needs reset but the softpack has to be disassembled and article states I should contact supplier first before taking battery apart. Is it safe to charge through discharge ports? Can you point me in the right direction?

[paxtana]

It is only safe to attempt jumpstart through discharge, not charge like that permanently.

If you check discharge contacts with multimeter what does it say?

If you push the multimeter leads through the insulation a little further back from the discharge connector what does it say?

Yes it is likely you will need to email support on this one.

[Acs1krr]

DIscharge (XT90) contacts read 53.4 on both side of discharge ports.. I also tried with xt60 charging ports results are the same 53.2 on both side of charging connector. Should I take it apart and try to reset BMS myself?