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31 Comments

  1. Every time I see a post like this I set a mental reminder to check my bike and never do…

  2. If it’s a new-new bike, that could be residue from the fluid they put in your hydraulic brakes.

  3. White gunk is normal on newborns, but usually the mother cleans it off pretty quickly 

  4. st0pmakings3ns3 on

    SRAM uses dot fluid and i suspect that’s what it is. It’s pretty agressive so I would take it to where you got it and ask them about it and have them make sure there’s nothing wrong with the brake.

  5. Those are the trails left by the aliens when they spawn under bicycle hoods. Get out of there if you value your life!!!

  6. Working-Camera-9790 on

    I’d be worried it’s caused by DOT fluid from your brakes. I’ve hard it’s highly caustic stuff which eats rubber.

    Edit: the reason everyone suspects DOT fluid is that the screw on top of your lever is the DOT fluid reservoir screw. If the person who filled it was sloppy and didn’t clean up their mess it could have eaten at the rubber of the hoods.

  7. That looks like the salt in the sweat of a roller bike, which chemically reacts with aluminum to build this white powder thing you see.
    Definitely not a new bike (or at least not a new handlebar)

  8. control__group on

    SRAM really need to stop using DOT fluid. If that’s what this is it was a very sloppy install. But I’ve spilled mineral oil and it doesn’t do this nor is it toxic to man beast and machine.

    The other possibility is sweat. But that is a serious amount of sweat for just a test ride.

  9. Is it a nice bike? If so, could be jizz. I hear the mechanics like to rub one out before giving a bike to a dentist

  10. Hot_Scientist9971 on

    It might have been new when the box came, but not after the guy who assembled it did.

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