. Need a 2 ply for drag racing they expand 40% which makes you go faster down the strip.
 Use something for trail riding a little stiffer. Maybee 2 different sets, one for drag and one trail riding. I like 6 ply for the tight hard turns. Make the quad handle so much better. I had a set on the front that didnt have a high ply rating and they rolled over really bad on this little wood track we made. Switch over Razr 2s on the front and x rex on the back both 6 ply. It was crazy how much better the quad handles the tight turn of this little track. Or you use the tires that came with your quad as trail tires.  Are you going to use 2 ply front and back for drag racing or just the back.