Originally Posted by crofrog
That's very simplified but somewhat accurate.
IMHO it doesn't matter what the "change" should be/could be. It matters what it IS. The only way to get a feel for what it actually is, is to ride until you find the limits of traction. Which unlike what many people think isn't nearly as bad as it sounds as long as you approach it gradually.
or like I said above, lock the rear in a straight line on a bunch of different roads and start getting a feel for that traction.
I could be throwing myself to the wolves with this but.....
I have changed my view a little on testing for grip. I used to dab a foot if I was concerned or dab the back brake. The first method is expensive on soles, the second is hit & miss to what you learn. Now, I weigh up what I can see & temper my speed & road position accordingly. If it is slippy I want to be in the best position to deal with it rather than guessing what is going to happen next. On wet clay & gravel, even wet tarmac I'm finding that spinning up the rear briefly in a straight line tells me more about grip than brakes, I think it is a more consistent test of traction because I can find the slip point.
Just my thoughts, don't be to harsh!