Hello all. I received my kit yesterday but have realized a problem. My bottom dropout fits the 68 - 73 requirement but my diameter is quite a bit larger than normal, (Low- end donor bike). Fortunately, I'm a Tool Maker and I have access to machine tools. Has anyone ever bushed the diameter of the bottom bracket? Also, wondering, what is the normal clearance between the Befang shaft (part that goes thru the frame) and a typical bottom dropout inside diameter? Or can anyone tell me what the typical bottom dropout inside diameter is? I appreciate your help!
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Luna Threaded BB Adapter for Niner Eccentric Bottom Brackets - Luna Cycle
To increase the clearance at BB for Cable guide, the BB adapter hole must be machined off-set as shown below:
Looks like I will have the same issue as you.
Hello All,
Thought that I would share some progress. As you can see from photos, I machined an aluminum bushing to place into my irregular Bottom Bracket. BTW, the Inside Diameter of my BB is 2.0". I gave the ID of the bracket about .015" clearance, and you can see that if fits over the Motor shaft just fine. Bushing installed with slight push in with my hand. Although, I now have two new problems. The Radius on the casting of the motor interferes with my Large BB OD. It appears that I can space this out and make it work. However, I now have no room / clearance for my BB Cable guide that would typically be placed on the bottom of the BB OD. In fact, I have ZERO clearance for my rear derailer cable to pass under my BB. Any thoughts? I see that "Folding bikes" have very sloppy cables without any particular routing except for the inch or so before their mechanisms. My only though at the moment is to have a sloppy route (not under the BB). Thanks for all of the suggestions thus far!
Keep your press fit on! Since, the inside diameter of the press fit is 46mm, the suggested 46mm adapter should fit into that.
Finally popped out the press fit. Actual diameter is 50mm is there one that will fit
After knock out your existing PF BB, re-measure your bottom bracket opening. If it is 46mm in diameter, then the mention "Bottom Bracket Adapter 46mm" from Johnny Nerd-out should work!
To save you from machining the part, this adapter for your bottom bracket may work. Check the inner Diameter of your bottom bracket! make sure it matches with this 46mm BB Adapter!
Bottom Bracket Adapter 46mm | Johnny Nerd Out Cust
Donor bike was a One-Piece Crank.
My apologies, my post was intended to reference the Bottom Bracket, not Dropout. Ugh!...