Freewheel tools, stronglight crank tool if they have one, tools tools tools!! And Campagnolo, Shimano, or Suntour that looks high end or unusual.
I say tools because I recently bought a set of tools off of CL for $75. They have helped me countless times already, and that's worth far more than what I paid for them. Not having to hit the LBS every time I need to remove a freewheel or a set of cranks? Priceless!,,,,BD
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So many bikes, so little dime.