Announcement

Collapse
No announcement yet.

Frustration with "73-100mm BB" BBSHD kit

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Doc.neuman
    commented on 's reply
    The way I understand the 120mm drives is that the spacers end up being needed between the black locking ring, and the first locking nut. In my case, the spacers are needed between the black locking ring and the bottom bracket. I'm unsure if that's and acceptable installation as it pushes the left pedal out 1 in.

  • spinningmagnets
    replied
    I have the 120mm drive in a frame with a 100mm bottom bracket. I had to use 20mm's worth of spacer rings, and it's working well so far.

    I'm sorry to hear about the difficulties you are experiencing, and I wish you the best of luck...
    Last edited by spinningmagnets; 08-12-2016, 11:56 AM. Reason: speling

    Leave a comment:


  • Doc.neuman
    replied
    I'm seeing other users that have dealt with this by putting a steel tube between the lock ring and the BB. Is this what I should be doing instead of exchanging for a smaller unit?
    Hello all, First time eBuilder here starting to assemble a Motobecane 29er fatbike with a Bafang bbshd. Waited until the bike arrived before ordering the motor kit

    Leave a comment:


  • Doc.neuman
    started a topic Frustration with "73-100mm BB" BBSHD kit

    Frustration with "73-100mm BB" BBSHD kit

    I just wanted to air my frustration with what LunaCycle markets as a "73-100mm BB" Kit.

    First, a bit of history. I'm building an ebike after getting a job closer to home and ultimately selling my car. I'd like to commute to work on a bike (12mi round trip), but don't want to have to pack clean clothes and then wait an hour to cool off to change into professional attire; an ebike is perfect for that. I made myself sell the car before ordering parts for the bike to ensure funding was available, so I'm without a personal vehicle at the moment. The platform I'm building on is a Surly ECR, which is currently outfitted with 29+ tires (3" wide). There isn't a lot of information about people turning this bike electric with BBSHD kits. The bike has a 73mm BB, but wide wheels, so I was afraid of interference with the chainstays. After all of the reading that I did here, and on Endless-Sphere, I thought it was best to get the larger BB Motor to ensure that I wasn't going to interfere with my chainstays. I made my order, and then it was time to wait.

    Well, the Friday after my order was made, I found a thread here with someone that built a Surly Ogre (same frame, narrow tires) who confirmed that they used the smaller BB BBSHD Kit (68-73mm). Crap. I called Luna to try and change the order, but it had already shipped. The service rep assured me that I would be able to make the motor fit with the provided spacers. Ok, fine.

    Yesterday the shipment came in. WOHHOOO!!! Time to build this thing up!

    Not so fast. The shaft that goes into the BB is WAY too long. There is no way in hell that this can fit without an inordinate amount of spacers (Definitely more thatn what is provided in the kit). How can LunaCycle market this as 73-100mm? I know that in the pictures I show half of the spacers on the non-drive side, and that the locking ring should be touching the bottom bracket, but the setup in the pictures is how I would want the drive side situated to ensure a good chain line. In the picture you can also see that the locking ring is in line with the motor mounts, so the only way to get the locking ring to touch the BB is to push the drive side out an additional 25mm. That would suck.

    I wanted this to work. I fiddled with this as much as I could last night until I realized that the best solution would be to return the unit for the 73mm BBSHD. I've got a new motor and a new battery on order (the battery I ordered was too big for the frame - totally my fault for not validating dimensions). I'll be shipping the original motor and battery back for a refund ASAP. I'm mostly frustrated with the waiting at this point. I don't think I'll see the shipment made until next week, and then it'll be another week until it arrives
Working...
X