Originally posted by CJM
4 ply is lighter and 6 ply is heavier, I wouldnt run a 4ply unless your racing MX-too easy to puncture.
+1 for 6ply.. I bought brand new Rzrs for the raptor and drove through a XC track/trail on our land and didn't make it a full lap without a slash in the sidewall.. Maxxis said it wasn't their problem.. I personally think it was a defect though, I've been through there 100s of times with all mx tires without issue (i suppose i'd be paying closer attention though)