• When riding brakeless/ slowing a FG without a brake, are you slowing down at the fastest possible rate at the point just before you start skidding?

    Probably, although it depends on whether you change your weight distribution after initiating the skid. Assuming you don't, the maximum coefficient of friction happens when the wheel is revolving slightly slower than it would be if rolling with no slip. The exact optimal slip rate would need to be determined by experiment for the specific friction pair under examination, but it's in the region of 5% of the true forward speed for rubber tyres on dry tarmac.

    It's worth bearing in mind that not only can no human achieve this by leg-braking a fixed wheel bicycle, but even if they could, and did so with their weight shifted to the rear to maximise the normal load at the tyre/road interface, they would still only achieve a deceleration anybody can easily manage with a hand operated caliper brake operating on the front wheel, and about half the rate a moderately skilled rider can achieve by modulating the front brake to maintain the bicycle at the tipping point where the rear wheel is about to leave the ground.

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