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

[toddphillips]

Last week I bought a Giant Fathom 29 2 and the Luna Cycle anniversary kit with the BBSO2 motor. Today I went to install it and it did not fit! It seems that my bottom bracket is too wide.

https://www.giant-bicycles.com/us/fathom-29-2

Is there any way to adjust for this?

[Zippy]

Why don't you tell us what bike you are trying to install it on and what the specific problem is. The installation is surprisingly very simple and all the wires are color coded so it's almost impossible to hook them up wrong.

[toddphillips]

zippy, It looks like you did not read the entire post. I bought a Giant Fathom 29 2. Now I am understanding that the bottom bracket is too wide to fit the BBS02.

[Zippy]

You don't mention the width of the Giant's BB, possibly this can be of help to you:

https://www.empoweredcycles.com/blogs/news/101474694-bottom-bracket-standards-and-bafang-mid-drive-motors

"The BBS02 comes in one size only (68mm) unless you have a custom machined unit with a longer square tapered spindle other than a 68mm. The 68mm BBS02 and BBSHD can easily fit 73mm bottom brackets. All that is needed is longer fixing plate bolts and a 5mm spacer (or stack some small washers) to compensate for the 5mm difference between the fixing plate and the motor. Usually only the 4 notch M33 lock ring will fit on the remaining spindle shaft threads and the second outer lock ring may not fit. What this all means is this... a 68 mm BBS02 can easily fit in both 68 mm and 73 mm shells"

[AdvancedAudioPro]

Hey Luna, I have a 2016 Salsa Mukluk that I want to make into a E-Bike. I have not found one build online that anyone built. Did a post on fast bike to run it up the pole and a mini cyclone was suggested because the BBSHD would not be ideal because of the way the front tube slopes into the BB. My questions are: Will a BBSHD work? Or the Deluxe Mini Cyclone? and what should I order to make this work. If it is a Cyclone what battery 72v?
This is my first build but I am skilled at figuring things out and fabrication. The bike has 41mm x 121mm press fit BB, ISIS crank arms. I have your Luna Ludicrous Fusion full S Fat (and love it) But I want this bike build to be able to keep up with it. Thanks for fast bikes
Dave

[BenS]

Both of my bbshd bikes have a similar down tube shape as yours, it just means the bbshd will hang a bit lower, that's all. If you're riding over big rocks, you just have to be a bit more careful, but if not, no problem!
The standard bbshd won't have the same power as the Ludicrous, of course.

[fos'l]

Installing Luna BBS02. Last time there was a 1/16" gap between the "fixing plate" and the motor; this time it exceeds 1/4 ". Is this normal?

[Sadaftaxi]

Hi there. I want use your offer and buy full option bikes 2 for adults and 1 for my son 10 years old please guide me which options I have too choose in order to buy best ones?
thanks
Matt

[paxtana]

AdvancedAudioPro a BBSHD would be doable for that shape of a frame just not ideal. It would hang down lower than it might otherwise be on a different frame. If you don't need a lot of ground clearance then the bigger issue would probably be making sure that you have the right press-fit adapter since that's not a standard bottom bracket shell.

[AdvancedAudioPro]

do you carry that press-fit adapter?

[paxtana]

https://lunacycle.com/pf41-bb-adaptor-for-pressfit-bb-fat-bikes-100mm-120mm-73mm/

[paxtana]

Installing Luna BBS02. Last time there was a 1/16" gap between the "fixing plate" and the motor; this time it exceeds 1/4 ". Is this normal?

Yes it is normal if installing on a 73 mm shell. The wider the shell is the further away the triangle bracket will be from the motor housing.
if this is just a small gap you might only need to use a washer or two. But if you are installing a BBS 02 which was designed for 68 mm but using it on a 73 mm that's several more millimeters than normal and it requires slight modification.


On a 73mm BB you may not fit the outer lockring on when using a BBS02 or BBS01. If this was included in your kit you also need to use the extra included washers, and the longer M6 x 20mm bolts. Otherwise you need to pick up a few washers and longer bolts. In any case use Loctite on the threads of the axle instead of using the second lockring (which really just acts as a jam nut) (this only applies to BBS02, 68 mm BBSHD has long enough axle this is not necessary)

[paxtana]

Hi there. I want use your offer and buy full option bikes 2 for adults and 1 for my son 10 years old please guide me which options I have too choose in order to buy best ones?
thanks
Matt

Hello Matt. It really depends on what you are looking for in a bike.
For a young man the Luna little would make a good ebike.

Or the mongoose BMX fat bike.

Both of these are a good size for a young person.
As far as for adults there's no single right answer on what is the best bike. A lot of folks seem to prefer electric fatbikes these days because they look very impressive with those big tires, and as long as you have a motor they are fun to ride. If you want something a little lighter you might go for a mountain bike, if you are just doing commuting and maybe some light trail riding you might use a front suspension bike, for more hard-core trail riding you might go for a full suspension bike instead. If you are going to use the bikes exclusively on the road we have some nice light weight bikes in the cross section and road section as well as cruisers and even a folding bike. The folding bike would also be a good choice for a young man since it is mobile and you can easily put it in the trunk of a car.

[fos'l]

Paxtana, thank you for your response although it was more like four hours than 30 minutes. The bottom bracket (BB) was 68 mm and I guess the gap was "normal". Decided to put the motor on a different bike , also with 68 mm BB, but steel frame, so better fit. Can't believe the crankarms are different when comparing the distance from the crankarm to the chainstay on the left and right side; had the same problem years ago, but thought it would be fixed by now..

[paxtana]

There's other causes such as an intrusive chainstay, hard to say for sure without having a look at your frame. Glad to hear you worked it out.

[BenS]

fos'l, If you want to fix the crank offset problem, the lekkie buzz bars are nice. With the "offset" set, the left arm is offset 18mm, and the right arm is straight. I have a pair on both of my bbshd bikes, and I think they're definitely worth the price! They're tough too!

[RusticoRay]

I did a quick search here. http://www.bing.com/images/search?vi...verlay&first=1 The only photo I found with white wires was this one.


There are 2 wires but they give them the same designation.

I don't know.

Thanks calfee20

[Norm Lane]

It looks like I've stripped out the bolt hole for the left side crank on my BBS02. It's working loose again even after I used Locktight Red. Last time I had the bolt out there were metal filings on it. I don't have a torque wrench and I guess I must have over-tightened it. What parts do I need to fix this? I should replace the bolt too.
The crappy cranks started this problem even though I've replaced them now I guess I did it too late.

[paxtana]

If you just need a bolt you can get one here

http://mikesbikes.com/product/problem-solvers-hex-crank-arm-fixing-bolt-cap-263202-1.htm?variations=2096451&gclid=EAIaIQobChMIvInS6_iE1gIVnlYNCh1s2QmfEAQYBSABEgLrHPD_BwE

if you are saying that the bolthole is stripped you might need to redo the hole with a tap and die https://en.wikipedia.org/wiki/Tap_and_die
if needed you could probably even drill it out to a larger size and then make new threads, and use a larger bolt. But you should probably reserve that as a last case scenario. If you are using stock cranks as the replacement you might consider aftermarket crank arms instead which are much less likely to work themselves loose

[rmeyer33]

Our speed sensor (on the motor side) on one of the two BBS02 Kits that we purchased does not work. I get the error 21H when I ride the bike and no speed is shown. I took the magnet off the wheel and held it to the speed sensor and the light did not turn on. I then took the other BBS02 that we purchased (have not installed that motor on the other bike yet) and plugged in the wires into the BBS02 and the speed sensor light lite up without a problem. Seeing that I can just plug & play with the other BBS02 with the same cables, speed sensor, & display - that it is with the BBS02?

[rmeyer33]

I totally swapped out the "Speed Sensor no red light" BBS02 with the other new BBS02 (with all the same parts besides the BBS02) and the speed sensor works fine.

[paxtana]

Sounds like you need to email support so we can send a replacement controller. support@lunacycle.com

[rmeyer33]

Thanks - I sent an email to support@lunacycle.com.

[ryanw1317]

I'm looking into getting the cyclone and a 72v battery for it but am worried about blowing out the controller. How often do controllers get blown out in this situation and how can I prevent it. Also, are there any heavy duty, sturdy bikes that will be able to handle the power that the setup will deliver? Have a BBS02 on a Trek mountain bike right now and was thinking about putting the cyclone and 72v battery on that bike but I'm worried the bike wont be able to handle that kind of power. Any help and/or advice would be great.

[stingray]

Hi there,

I am very interested in the anniversary sale with the BBS02 and Panasonic battery. I was wondering though, is it possible to get a similar deal but with the mighty mini battery (52V battery) instead? It is currently $100 cheaper than the Panasonic so possibly $650 for the anniversary sale? I know it's already a great deal but I really don't want to haul around such a large battery. If I could get that deal I would definitely go for it!!

[paxtana]

Sorry the anniversary sale is a special package deal we aren't doing modifications on it. But you can select no battery on the kit and then go to the battery listing and add it to the order if you like.

[paxtana]

ryanw1317 if using with 72 V battery, as long as it's one of the controllers that we say can work with 72 V it's not any less reliable than any other system. It's not very frequently that controllers blow out, but unfortunately when it does happen it's mostly bad luck not something you can avoid. Although I suspect using dielectric grease on all electrical connectors and power wiring may be helpful. Always nice to have backup parts on hand if this is a concern.

If the bike you are considering is a hardtail mountain bike it probably won't be an issue, although there's a few considerations such as motor placement, and chainline. The more power you run through a bike the harder it is on the drivetrain.. It makes a lot of sense with cyclone in particular to try out the method on our documentation to modify the cassette to reduce shifting and improve chainline

[wingfold2001]

I'm considering the BBS02 Mid Drive KIT for my mountain bike. Since it's an 18 speed with 3 sprockets, how do I choose the right sprocket size?

[paxtana]

If you want to optimize for torque go for a smaller front sprocket and if you want to optimize for top speed go for a larger one.

[cajk]

When I motorized my 24-speed tadpole trike, I had to make the same choice: replace 3 sprockets with one. I did a careful assessment of my riding style, noting in particular which sprocket-chainring combos I used most often on a daily basis. As it (happily) turned out, the standard 46T sprocket that came with my BBS02 kit was perfect for my needs. On my daily rides, I normally stay in the middle gears of my 8-speed cassette, and hardly ever need to use the lowest or highest gear.

BUT, I always ride on pavement in flat terrain. If you ride single track in hilly country, you will require a wider range of gearing, so choosing a single sprocket will be harder. One thing to remember - you need to keep the motor spinning. Lugging the motor at low RPM in high gears will overheat it and eventually kill it. You may have to sacrifice some high speed capability to keep the motor happy. If your final gearing choice causes you to spin out the pedals at high speeds, you can always just stop pedaling and go to "motorbike" mode using just the throttle.