[GRB60]

I could be wrong here but with the tire sizes listed your wheel/tire combo makes for different diameters front and rear. The sensor thinks that there is some slippage because the fronts, being smaller than the rears, are turning faster than the rears.

Try swapping the stockers (or any combo where the diameters are consistent front to rear) and see if the light goes away. If it does the ABS module is working properly.