Q: I blew out my front right tire yesterday on really rought terrain and had to go to work with the full size spare. I currently have continental procontacts on all four. Does anyone with experience on tires know if I must change all four? I will rather just buy one (cost about $108). Or, can I just change the two front ones? Having to change all four might require switching to cheaper Pirelli P4s. Any experience with those?

A: It depends on the condition of the remaining tires. I would recommend replacing 2 tires - keep them together on either the front or the rear. If the tires are less than 80% worn, I think you could get away with just replacing one.
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