Hi Speedy 4x4. Yes, pot holes, railroad tracks. I live in the city and city streets are terrible in a lot of areas. I replace all four tires at least one year ago or so. Rims cracked at different times. Time to buy new tires now. I also want to find good sturdy rims. The rims I have now are aluminum which came with the Crossfire except the two new rims purchased which are aluminum, too. I want to buy 4 new tires & 4 new rims. Beginming with front first. Thank you for responding.