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I often see sports bikes with flannel looking wrist sweat things on what must be the brake resevoir, sometimes on both sides.

WTF is that about?

My first thought it that they help keep the cold off but I see them in the summer.
Responses (5)
  • Accepted Answer

    Thursday, March 26 2015, 07:40 PM - #Permalink
    Yes, could be to keep the brake and clutch fluids at constant temperature.
    With modern fluids its probably less important now so its one more thing on a bike to personalise.

    With the wind chill factor it may be beneficial on cooler days but not so much in summer. (Maybe in summer it keeps em cooler by keeping the sun off)
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  • Accepted Answer

    Thursday, March 26 2015, 08:46 PM - #Permalink
    Ah, right, thanks. I thought it was a bit strange.
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  • Accepted Answer

    Friday, March 27 2015, 07:17 PM - #Permalink
    Nah, thr truth is os for the fairy riders to remove it and use it to bunch their long hair up after the ride... :D
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  • Accepted Answer

    Saturday, March 28 2015, 07:55 PM - #Permalink
    GrandNate wrote:

    Nah, thr truth is os for the fairy riders to remove it and use it to bunch their long hair up after the ride... :D


    Ha quailty. :D :D :D
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  • Accepted Answer

    Monday, April 13 2015, 02:34 PM - #Permalink
    After extensive research (talking to a racer friend) I can reveal the true reasons for having a "Reservoir sock"
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    First thing to note is brake fluid is one of the most corrosive fluids in a bike. (Its can also be more flammable than petrol)
    When racing, the brake fluid can often be replaced/topped up between sessions and the sock absorbs drips onto the frame etc.
    The braking system is put under VERY heavy pressure when racing so there may also be leaks there.
    ...and finally in the event of a crash the sock will absorb some fluid preventing it going on the track.
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