While pumping my tires with air I noticed my two back tires (a different brand from the two front tires) had cracking in between the treads all the way around the tires. This must be a manufacturers defect and an obvious safety concern. Here is tire information (and designations) as designated on the sidewall: Rear driverside tire: Achiles platinum made in indonesia (5N1) manufactured by multi strada arahsarana tubeless steel belted radial 195/70 R1491H mold no. 03-02 E4 (encircled) 0228041 dot 5kjn hp 3606 thread: 1 polyester, 2 steel, 2 nylon; sidewall 1 polyester threadwear 280 traction a temperature a oddly enough, the rear passenger tire seems to match the above information with two exceptions: Threadwear 420 traction aa temperature a mold no. 03-03 we bought tires from figueroa tires in los banos. We don't have a receipt to confirm this. These tires must have been purchased before 04/29/10 since we did find a service order receipt from walmart tire & lube express dated 04/29/10 that states in the TPMS and tire disclaimer receipt: Actions: Replace one or more of the tires on the vehicle...reasons: Visible tire cut, puncture, bald spot, or other irregularity.

- Los Banos, CA, USA