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

[drhong]

I lost two bolts for the BBS02 C961 display mount. Does anybody know the type of bolt (pitch, size, etc.) or if there is a way to order a replacement? Thanks.

[HIGHVOLTAGE]

Display screws: hexhead wrench 3mm, screw threaded portion diameter 3.9mm, thread length 12.0 - M4 12mm

Control screw: hexhead wrench 2.5mm, screw threaded portion diameter 2.9mm, thread length 10.0 - M3 10mm

[robrien24]

Can I use my custom SRAM Apex splined crank arms with any of your mid drive products?

[HIGHVOLTAGE]

Looks like one of those arms is attached to the main sprocket. I don't think you're going to be able to use them in a kit as you need the base arms without any attachments. Unicycle cranks are good for Mid-Drive kits usually. The kit should already come with crank arms though and there are aftermarket modifications available like the Lekkie Buzz Bars

[robrien24]

Fortunately the chain rings are removable and the remaining spider arms can even be cut off too if they interfere. I was more concerned with using the same splined hollow axle that mates with the crank arms instead of the old tapered square axle design that I think comes with most of the kits. These arms were shortened for me to 157mm at considerable expense so I;d like to re-use them if possible. Here is a picture of another set with the chain rings removed (and it's mating BB). I was thinking possibly the Luna Mini Cyclone could work...but I'm very new to this. Thanks.

[paxtana]

That will NOT work with cyclone. While it does use the isis interface, cyclone cranks are specially made so the chainrings available thread onto it. At best you could use the left crank arm, but not the right. Note in the picture below that threaded portion. You don't have that on regular bicycle cranks regardless of whether they are square taper or isis.

[eric_ric]

I have multiple 52V Luna mini chargers (with 80/90/100 dial). I'm thinking of building another e-bike that I might use a 48V battery with. Is there any reason why I shouldn't use my existing 52V Luna chargers with a 48V battery -- of course I wouldn't use the 100% setting, only the 80% of 90%. I'd like to avoid needing another charger. Thanks.

[paxtana]

The chargers do not adjust the output voltage depending on the charge percentage you are wanting it to end at. They put out the voltage that you would have at 100% and just change cc/cv mode at a different point in the cycle. Even if you intended it to be cutting at less than 100% you are putting in too much voltage during that cycle. Great way to burn your house down.

[zmarkjam]

Hi eric_ric, your math is correct assuming that a fully discharged pack is 0 volts. However a fully discharged 52 volt pack is 42 volts. That gives you 16.8 volts in your energy tank so you have to take your percentages from there. 10% of 16.8 is 1.68 (or 1.7 rounded up). Subtract 1.7 from 58.8 to get 57.1v which is 90% charge. Likewise 20% of 16.8 is 3.36 (or 3.4 rounded up). Subtract 3.4 from 58.8 to get 55.4 which is 80% charge. Here's a chart.

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

[eric_ric]

Got it, thanks for the helpful additional info. Makes sense. I'll think about whether I want to burn my house down and then make a decision on what to do.

[robrien24]

OK thanks. What is the stock crank arm length? Possibly I can have the holes relocated to 157mm if there is enough meat available. That's how mine were shortened.

[paxtana]

Pretty sure they are 170mm

[swamp]

I bought the luna bbshd kit with the 52v battery and the blue charger with the knobs on the back. I finished the build 3 days ago. I charged the battery until the light turned green on the charger before I used it (knob set to 100%). after short first ride noticed battery dropped to 75% on the bikes color display... so I let it cool down and charged it on 100% again. .. however when I look at the bikes display it doesnt say 100%.. it says 80%... how do I get the battery to charge to 100%? I have the charger set to 100%

this is the charger I have:

Luna Charger 52V Advanced 300W Ebike Charger

this is the battery I have:

Luna Wolf V2 52v Battery Pack

thanks!

[paxtana]

Those gauges are only for 48 volt and are notoriously unreliable even in those instances. You should use the voltage reading on the display instead

[Gizmo350k]

Hi,

I'm trying to figure out what's possible for an electric fat bike setup that will allow me to, at worst case scenario, throttle up a mountain for my daily commute (2k ft elevation for 6.5 miles) at 30mph. I don't care if use up most of the battery as I'll just charge it after I arrive at home. My biggest concern is being able to keep a high speed so the commute doesn't take so long that I'd rather drive a car. A fat bike is ideal because there could be snow, and the last mile is a dirt. I want to be able to handle anything.

In a perfect world, I would just buy this pre-built. I can build it myself if I have to.

Thanks!

The attached image and link is googles bike commute estimates. A car can do this commune in less than 20 minutes. That's what I'm competing with. 30 minutes would be fine. Anything more than that, and I'll be very tempted to just drive instead.

https://www.google.com/maps/dir/Mapl...40.0615284!3e1

I too am working on a similar bike build... and im run into a bit of a road block.

Things i have:

• Luna Eccentric BB Adapter (Ashtabula)
• Luna Mini Charger (52v)
• BBSHD Kit Base, 68mm, Default 48T Chainring, Default Brake Handles, etc
• Generic Chinese Bicycle 24" Tires (discarding this at once..)
• Homemade 52v pack, averaging 8000mah per cell group ^_^;
  
  https://www.google.com/maps/dir/18.4...m3!4m2!3e2!4e1

Commute is also 2000ft, i am willing to pedal some of the way, getting home in 30 - 40 minutes is fine.

My biggest concern to you guys is.
Where can i find a good mountain bike, with

• disc brakes
• front suspension (optional)
• and the proper bottom bracket (or eccentric)
• derailleur hanger
• threadless stem
• quick release levers!?!?! (not sure how good of an idea this is especially for back wheel)

to fit all my above parts onto? It's proving more difficult than it should be. lmao :(

The climbing is important but even more important is the descent which is quite gnarly, and like any extreme mountain trail. except its on tarmac... lmao

[paxtana]

I think bottom line you should pick out the best frame that will fit the battery you have in mind and/or the bottom bracket, and not worry about that extra stuff. You can always change out the fork for aftermarket suspension fork, and use adapters for whatever headset you want, and the aftermarket fork will have post mount for disk brake so you can use whatever disk brake you want (you do most of your braking with the front so rear is much less important)

[Gizmo350k]

Thank you so much Paxtana. My brain is now working like 60 to consider all the possibilities i have going forward. I will swap out the 24" for a similar 26" frame (for more road clearance for those godawful potholes and the bafang) and work it up from there. I will start to post my progress in the builder gallery in coming weeks :)

[skymon]

I've got a 3 year old 52V Mini Charger. It shows 58.8V output. But when connected to a compatible battery, it only starts up momentarily and then shuts off. Output voltage drops slowly after that.

Unplugging and replugging into 110v outet just repeats malfunction above.

Is it bricked?

(I saw a couple of threads with similar symptoms. But I never saw a diagnosis)

[paxtana]

Sounds like it may need to be replaced.

[Robstra58]

I'm struggling the navigation lol sorry , I'm building the 48v 1500w rear hub voilamart kit , with internal controller, they (internal controllers ) don't seem very common ? I want the power this will offer and hopefully I can program the "sw900" is it straight forward ? Is there a decent set of instructions available ? Thankyou so very much for your time and consideration

[paxtana]

No idea, this thread is for questions about stuff bought from Luna. But if you make a separate thread maybe you'll get an answer

[Illwind73]

I purchased my CA3 in December 2019, and my Grin tech inline shunt came this morning January 5, 2020,
Finally it’s here, so I plug CA3 to shunt and turn on the battery and, the CA3 is just flicking,
Please help, what is going on ?
I just wanna rideee !!!!
I triple checked all my connections.

[paxtana]

No idea, this thread is for questions about stuff bought from Luna. But if you make a separate thread maybe you'll get an answer

[DavidQA]

Question on the spacer adaptors for BBSHD on Giant Roam with Eclipse 42T: For the build you do inhouse at Luna, what spacer setup do you use? I have a Giant Roam and used the BBSHD kit with the stock chainring and all fit fine. But then ordered the 42T Eclipse and the teeth hit the frame. The chainring adaptors seem to push out the chainring too far to fit the center bore correctly + the bolts are too short. Do I need to remove the motor and install some bracket adaptors?

[HIGHVOLTAGE]

I don't think the shop uses any special setup. I'm pretty sure it's different for every bike. Some bike builds have better chainlines than others. They're not all perfect unfortunately.

This might help:

https://electricbike.com/forum/forum/knowledge-base/motors-and-kits/bbshd/39170-how-to-rework-rear-sprockets-for-mid-drive-systems

[DavidQA]

I thought you might have a known spacer setup that works best on the Roam+ 42T Eclipse since you kit that bike inhouse. I was just hoping I didn't have to yank the motor off. Thanks.

[matthewdodson]

Questions about the stealth luna bike.

1. My commute is flat but can be very windy. If the assist is set to the highest level, how much can it help push past wind (given it requires pedaling which is hard in wind?)
2. I know range estimates are hard, but, the 20 mi estimate is with what level of assist?
3. Can this support a kid seat, any suggested ones (front or back)?
4. There are a lot of questions on the product page re: the battery. Can more information be shared regarding future plans: range of prices to replace, rough date when available. I am concerned about investing and not being able to replace the batteries.

Thank you!

[HIGHVOLTAGE]

1. This is not really a question that can be answered. Help isn't really a measurement. It will push past wind though.

2. As you said, it's a difficult question to answer. There are tons of factors that go into range than just assist and battery. Wind resistance, terrain, tires, and riding style all play a huge part in how much range each person gets. This can only really be estimated by yourself based on how you ride and what the terrain is like (how much is uphill vs how much downhill) and how much you weigh. Having a child on the back may reduce your range greatly.

3. I'm sure it can. I haven't had any experience with kid seats but they're usually made to fit universally on bikes. So it shouldn't be an issue.

4. Future plans are usually announced on Facebook or the Fast Electric Bike page. None of us here have any information on that kind of stuff unfortunately. Join the FEB page for up to date info on future Luna products. That's where Eric hangs out and spills the beans occasionally for his fans.

Although that being said, you can always just take the battery out and replace it yourself. It is a bit of DIY work but that's kind of where the fun is for some here. Maybe you'll may be able to find someone in the future who can replace it for you or upgrade it for you?

[paxtana]

20 miles would not be in the highest assist level, and a strong wind would probably reduce range. The bike itself can support a kid seat or at least one of those trailers, but it's not really built for range or performance to do that. You may want one of our other models. For example our folding bike with the wolf battery is same price but 2.5x the capacity, which seems like it may be more suitable for your use case.

[TaylorN]

Question: I saw someone say that a bbs02 motor/controller might have to be reprogrammed to switch from a 48v battery to 52v. Is that true? or can you attach/use either without a problem?

Thanks!

[HIGHVOLTAGE]

If it's from Luna, then works with both, no programming needed. Can't speak for other vendors though.

[TaylorN]

Yeah, its all from Luna about 2016/2017 timeframe

[TaylorN]

Question: Is there a printable mockup template for the Wolf pup battery (https://lunacycle.com/wolf-pup/) like the one available for the Wolf V2? And is there an exact weight specification for the Wolf Pup battery? Thanks as always!

[TaylorN]

Thanks guys! What side of the wolf pup has the metal sheet in it for magnetic mounting? is it the side with the curved cut out (bottom) and straps, or is it the top flat side?

[TaylorN]

what is the better mount for the wolf pup, 1) a cut down https://lunacycle.com/luna-wolf-extra-magnet-mount/ or 2) the Circular Dual Magnet Mount listed on the wolf pup page? I was thinking of using the existing water bottle holder holes.

[Cavi]

I also run a pup and can get about 8 miles on mine. Currently I run the circular magnets and it works great however I would like the mount from the big wolf but it has been on backorder forever. I might buy a big one for longer rides then I have the best of both worlds