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Shimano Nexus 8 with Gates CDN belt

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    Shimano Nexus 8 with Gates CDN belt

    I have an older Trek Soho that I dearly love that I want to add a Bafang BBS02 drive to. It has a 68mm BB, a Nexus 8, and the older non center trak belt, which can tolerate a couple mm less belt[chain]line, so about 43mm. I have a 55T 5-hole, 130 BCD front sprocket, and adequate chainstay clearance, so I think my only rub is finding an adaptor with a 15 mm dish, as I've read that the clutch flange is at 58mm.

    I'm an old guy, just wanting to climb longer hills with my granddaughter onboard, so don't need the power (or cost) of the BBHSD, and I'm not certain the clutch would clear the chainstay (though I could likely mod it) so wanted to stick to the BBS02.

    I've seen this one: http://precialps.com/uk/accessories-...s01-bbs02.html but they don't list the dish,
    I see others for the BBSH and this: https://dillengerelectricbikes.com/s...nia-ebike.html which looks like no dish.

    Anyone have another source for this adaptor?



    #2
    Originally posted by nesdon View Post
    I have an older Trek Soho that I dearly love that I want to add a Bafang BBS02 drive to. It has a 68mm BB, a Nexus 8, and the older non center trak belt, which can tolerate a couple mm less belt[chain]line, so about 43mm. I have a 55T 5-hole, 130 BCD front sprocket, and adequate chainstay clearance, so I think my only rub is finding an adaptor with a 15 mm dish, as I've read that the clutch flange is at 58mm.

    I'm an old guy, just wanting to climb longer hills with my granddaughter onboard, so don't need the power (or cost) of the BBHSD, and I'm not certain the clutch would clear the chainstay (though I could likely mod it) so wanted to stick to the BBS02.

    I've seen this one: http://precialps.com/uk/accessories-...s01-bbs02.html but they don't list the dish,
    I see others for the BBSH and this: https://dillengerelectricbikes.com/s...nia-ebike.html which looks like no dish.

    Anyone have another source for this adaptor?

    Another member already used one of those. http://electricbike.com/forum/forum/...om-build/page2

    Comment


      #3
      Thanks, calfee, I had read that thread. He's using an SA 3 speed, and reading it more carefully I find that he gets a 54mm belt line from that Precialps adaptor, meaning about a 6-7mm offset if I read it correctly, leaving me needing another 7-8mm, which is likely too much to handle with individual spacers, meaning I'll need a full ring, tho turning a 7 mm thick 130mm ring shouldn't be too bad.

      What i'd prefer is something like the Luna Eclipse, as an adaptor to a 130 BCD, with the 50mm center hole. This looks like it has more offset: https://www.s-tech-ebike.de/zubehoer...gungsbohrungen. Tho not that 15 I need.

      I also found this with some good data, there Cal Ebike is saying Rohloffs only, tho clearly from Rider's Soma build, others can work. https://california-ebike.com/thinkin...lt-drive-bike/
      From that I also see that the 132mm clutch diameter of the BBSH will prevent a simple bolt up of a 130 BCD chain ring, tho the gates 55T could be modified to attach to the eclipse iwht nither ring adator, tho the 5 to 7 spoke adaptor would be a bit clunky.

      The thing to do might be to just design one from scratch and have it CNC'd. There are a lot of Shimano IGH hubs out there and the all the nexus and alfine, from 3 to 11 have close enough chainlines to use it. Its a shame Bafang didn't hold the clutch housing to 120mm so that these could work with std 130 chain rings. I also saw a BBSH nuvinci gates conversion somewhere using the eclipse, but the nuvinci's chain line is a little more outboard.

      Comment


        #4
        I tried using the gates belt and the BBS02 on my Trek Soho Deluxe. The mechanic couldn't get the belt alignment close enough; so, I changed to a chain. I hope my Nexus 8 spd hub can take the torque from the mid drive motor. I have had no problems yet.

        Comment


        • ncmired
          ncmired commented
          Editing a comment
          My Nexus 8 has help up fine driven by a BBSHD, and (I strongly suspect) protected via a shift sensor.
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