I ran the whole last season with a 1.25 ripsaw studded 144, that's 96 in the middle and every other on the outside. No issues, this was on a stock 2005 RX-1. My 2003 RX-1 136 with a 1.25 ripsaw, turboed at 10 lbs, studded 168, every other on the outside, no issues so far this season. I bend a few studs every season and it is usually the ones on the outside that bends. I have not had any pull through or break. For the best possible tracktion you have to stud the outside.