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Bafang Ultra teardown of torque sensor assembly

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    Bafang Ultra teardown of torque sensor assembly

    For reference

    Click image for larger version

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    #2
    Hi Paxtana, just on the subject of the Ultra motor, does it have both torque and cadence?

    And how noisy is it compared to the BBSHD as i understand they changed to steel gears recently?

    I do like the way cadence PAS works in my BBSHD.

    Comment


      #3
      I'd love to have a (non-fat tire) commuter bike with this motor, and have, like others, been sniffing around for frames. What about the chain line? Does the Bafang Max motor spline chain ring spider fit on the Ultra motor?

      I'd hate to have to do what Rodriguez did with this build (probably a 55mm chainline, since it has a Rohloff):
      Click image for larger version

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      Where do the Bafang Ultra build fans hang out? I get that nobody can market the Ultra on a road bike - market it as a trail bike, or as a frame / motor / whatever kit.
      2nd build, 2018 Crust Scapegoat, BBS02 or BBSHD, Rohloff IGH
      3rd build, 2018 Crust Evasion step-thru, BBS02, Shimano Nexus INTER-3 IGH
      4th build, 2016 Salsa Marrakesh flatbar frameset, BBSHD, Alfine 8 IGH
      Electronic throttle lock

      Visit the forum knowledge base

      Comment


        #4
        @paxtana

        I'm trying to remove the gear & axle as you did.

        I have removed the two snap rings using bent-nose pliers.

        However I fail to see how to continue. Is there something else to unscrew like with the special 4-teeth tool on the BBS series ?

        I tried to hammer the axle one way or another but it wouldn't buldge :?

        Thx for the help !


        edit:

        found a way to do it.

        Attach the chainring spider to get a good grip and pull out.

        It might be hard at first, I pulled a bit on one arm of the spider, then onto the next one in a circle fashion and it eventually came out.

        Once extracted, you get direct access to the clutch mechanism & needle/thrust bearing. They look fairly similar to the bbshd ones.





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        Last edited by Ivanovitch_k; 06-17-2018, 02:58 PM.

        Comment


          #5
          Hi Robert - I've come across a few Bafang Ultra frames via Alibaba as well, but all the interesting ones are not sold single unit quantities. I'm not in a financial position to swing a custom Ultra frame / build, so I'm sitting on the sidelines for now. Plus, I'm a little worried about the Ultra motor product lifespan, and leery about speeding big dollars on a bike constrained to a potentially short span motor availability.

          Who knows, isn't it about time for a Bafang BBS04 motor ;-), or at the very least, a standard defined for the motor hanger.
          Last edited by ncrkd; 06-17-2018, 03:37 PM.
          2nd build, 2018 Crust Scapegoat, BBS02 or BBSHD, Rohloff IGH
          3rd build, 2018 Crust Evasion step-thru, BBS02, Shimano Nexus INTER-3 IGH
          4th build, 2016 Salsa Marrakesh flatbar frameset, BBSHD, Alfine 8 IGH
          Electronic throttle lock

          Visit the forum knowledge base

          Comment


            #6
            the freys are 2000-4000$ with shipping to eu/na depending on configuration (higher end can come with sram ex1 & 52V reention downtube integrated batteries).
            see ES thread.

            there is also Excess bikes, a german-made carbon fiber frame with the ultra. FLX bikes got an Al one too. And, of course, luna with the apex.

            IIRC someone over at ES also got a made to order titanium FS frame too.

            Comment

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