Regarding the grippy tires, if you have a Ground Force, as opposed to a Ground Force Drifter, then it has four rubber tires. These rubber tires harden and loose their ability to grip as they age, so installing new wheels should help with the traction problem. The Razor Ground Force's wheels are unique to the Ground Force and I do not know of any alternative replacement wheels that are available, so replacing them with stock wheels is the only option that I know of.
Please let me know if you have any questions.
Please let me know if you have any further questions.