No announcement yet.

Bafang Ultra Fatbike build

  • Filter
  • Time
  • Show
Clear All
new posts

    Originally posted by xcnick View Post
    How does the Ultra do bottom bracket size?. I realize no bottom bracket per se, but I want the big Q factor to go around a fat bike tire. Really just the chainring from center as far as possible.

    There are 2 versions of the Ultra's spider. One specifically for Fatbikes.


      This thread is a goldmine.


      • JPLabs
        JPLabs commented
        Editing a comment
        It sure is. Building with an Ultra drive isn't quite the daunting leap into the unknown, as it was before. The guys who dove in first, learned, and are now sharing what they learned, are e-biking heroes. Taking risks for the betterment of all.

        Thanks guys!

      • ErikYoung89
        ErikYoung89 commented
        Editing a comment
        Daxxie has considerable experience and I'm thrilled that he's sharing it in such a detailed way.

        Hopefully whatever I learn from my steel frame mod I can share in an equally useful way.

      that's bitchen


        Hey Daxxie, cool build.

        Can you post what was your final specification for the frame to the factory? It would greatly help as a starting point for ordering.


          Frame specs:

          Frame for Bafang Ultra G510

          197x12 thru axle

          26" 500mm 1.78cm

          Headtube 41.8mm/52mm,

          Head tube angle: 69°

          31.6mm seatpost

          seat tube angle: 73°

          I’m 1.78cm tall and the 500mm frame is a little bit too big for me.

          If I had to order one again I would go for 480mm

          I also changed the water bottle holes so a Hailong big shark case would fit.


          • andrie
            andrie commented
            Editing a comment
            How do you like the Bafang Ultra and the Titanium frame? I'm thinking of doing a similar build.

          • Daxxie
            Daxxie commented
            Editing a comment
            I really love this bike.
            Have 2 other BBSHD bikes but rarely use them anymore.

            This titanium frames is very flexible. You have to get used to it initially.
            The 2500w Ultra is very powerfull, I do have excessive drivetrain wear.
            Still looking for better casettes and chains.

          • AZguy
            AZguy commented
            Editing a comment
            SunRace makes very nice steel cog cassettes