I believe the rule of thumb is to put a penny upside down in the tread and if you can see the top of abe's head then its time for tires. I believe 3/32 is the recommended minimum you should run around on safely, especially if your in an area with rain or the roads get slick alot.
Here in NM I can run mine a little longer just because its drier and we have few days of actual moisture where the roads actually get hazardous for me.
Here in NM I can run mine a little longer just because its drier and we have few days of actual moisture where the roads actually get hazardous for me.