i am currently workin on the Bicycle-Frame-Building-Jig that is designed by tanner W at Instructables https://www.instructables.com/id/Bicycle-Frame-Building-Jig/

which bottom bracket assemblies should i work out:

The question is - which bottom bracket-assembly-types would you suggest!?which axles and dummy shells should i drill see https://www.instructables.com/id/Bicycle-Frame-Building-Jig/

well at the moment i am musing bout the extras and features

  • what should i add
  • which features should i add
  • eg some dummy axles for the bottom bracket assembly - what do you suggest!?

i think as long as we can get a standard English bb in both 68 and 73, we should be fine.

afaik: It's hard to deal with the press fit sizes because AFAIK nobody is selling facing/reaming tools for them. As far as i know: Paragon has a ton of bb shells available, so we could match what they sell.

but I think the two most standard sizes will probably do for now.

the tanner w fixture is adjustable for width, so we only need one set of blocks see here: https://www.instructables.com/id/Bicycle-Frame-Building-Jig/

and also see the bottom bracket shells: https://www.paragonmachineworks.com/frame-building-parts/bottom-bracket-shells/steel.html

well at the moment i am musing bout the extras - what should i add ?

  • 1
    Regarding press fit: Can’t you use a CNC milling machine to get the required precision?
    – Michael
    Commented Jul 16, 2020 at 12:24
  • i guess so.. I am mainly interested in english threaded shells - what do you tink aobut this!?! BTW - which dummy axles would you add - which things would you make better in this jig? love to hear from you
    – zero
    Commented Jul 16, 2020 at 12:32
  • Backlink to dupe bicycles.stackexchange.com/questions/72117/…
    – Criggie
    Commented Oct 8, 2020 at 3:59

1 Answer 1


You should use tapered cones, so they work with any BB. There's no need to have different fittings for different BB.

  • hi there - many many thanks for this hint - great! BTW _ any thing that you would add to this jig !? Any thing that you would do aditionally!? Love to hear from you - regards
    – zero
    Commented Jul 16, 2020 at 15:35
  • 1
    I'm not familiar with the jig in question. I made my own jig. But I have seen a few bicycle jigs and the tapered plugs for the BB and headtube are pretty typical because they work with different sizes. Commented Jul 17, 2020 at 1:57
  • thank you so much
    – zero
    Commented Jul 17, 2020 at 11:25

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