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Pressfit Bottom Bracket BB86 Removal tool [FSA 19mm Shaft]
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Pressfit bottom bracket removal tool for a 19mm crankshaft for the BB86 standard
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- Tools
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- Creative Commons — Attribution — Noncommercial
Inspired by: Pressfit Bottom Bracket BB86 Bearing Remover v2 (for 24mm cranks)
Print Recommendations: (what worked for me)
- Special:
- add pause to insert m8 nut at the last layer before it is covered (was layer 103 for me) [see image]
- Material: PETG
- Wall loops: 4
- Infill: 18%, Gyroid
- Layer Height: 0.16mm
Note: I do not recommend fiber filled material. It becomes more brittle increasing the likelihood the “prongs” will snap during insertion
Additional Materials:
- 1x Standard M8 Nut (13mm hex, 6.3mm depth)
- 1x M8 Bolt (80-90mm)
- All thread of 80mm+ will work (with an additional nut to secure it in place). I recommend this as you will probably be using a m8 all thread to press the new bottom bracket in.
- Dead blow hammer or mallet
Instructions:
- Insert main body into the bottom bracket (side agnostic) via the round shaft, not the prongs.
- Ensure prongs have fully cleared the inner bearing race.
- You may need to tap the body in with a hammer-- this is a tight fit.
- Place wedge piece on bolt and insert bolt through the tool body threading it into the internal nut.
- Ensure wedge is indexed correctly between the prongs.
- Do not over tighten. Thread only enough to ensure prongs are expanded to engage with the internal bearing face.
- Hammer time.
- Dead blow hammer is ideal. Envision swinging through the tool.
- A single solid blow should send the bearing flying out (in my case). Small taps did not break the static friction / pre-applied retaining compound.
Additional:
- Step file included
- Type A: The same file as the stl export
- Type B: Hex for you to incorporate alternative thread and nut arrangement
Personal:
- Obviously not a professional tool replacement, however this worked first time for me and it is in good enough shape to use again. That said, I upgraded to a hollow-tech crank.
- Regarding the wedge addition, I think it is the added piece required to make this tool type, in a plastic format, viable especially at the lower 19mm diameter.