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That's the chain guard bracket and it would likely come off with a bottom bracket lockring tool. The fixed cup of the bottom bracket should be behind it.


2

All other things being equal, T-shaped Allen wrenches will work better than L-shaped Allen wrenches. When I say T-shaped Allen wrenches, I'm talking about wrenches like these: as well as the 3-way hex wrenches like the one you mention: This is because the shape of these tools allows you to exert pressure from directly above the bolt rather than ...


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If you are referring to getting to the brake lever bolt from an angle because it is behind the cable then that is when the ball end comes in handy If the bolt is dirty the ball end also penetrates a little better but cleaning the bolt is the better path Use the regular end when you can come in straight for more contact area Even straight on I ...


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FWIW, I have found allen wrenches that have a ball end to generally be of higher quality and less likely to round off. My experience is that generally the wrench fails long before the bolt. If the wrench gets rounded off, you need to stop using it ASAP. If you are doing lot's of your own bike work, it's worth investing in a set of T-handled allen ...


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I have never had a problem with Allan keys rounding. Using the correct size, using them correctly (Inserting them fully and not letting them slip out the bolt) and not using too much torque for the bolt size means even cheap Allan keys will last a lifetime. If the bolt head has rusted or has gunk in it, you sometimes cannot easily get the Allan key in all ...



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