james_giant wrote:and Dougal, whats the lateral force on a tyre? by lateral I mean sideways when you are hard out cornering.
That's a hard one to quantify on a bike, because you lean into the corners you're effectively putting all of your weight on the same line as you would when you're upright.
In that case on a hard surface, the lateral force is your weight times the sine of the angle you're leaning at (zero degrees being vertical). 30 degrees lean makes for the lateral force of half your weight.
If you lean more or less than the bike or ride on soft ground, it gets much more complicated. Let alone the proportion of weight on the front/back through a corner.