This will be my second year of ice rally racing and in the first year i learned a ton. stud set up is key to staying consistent with your times. trying to get them to stay in can be a challenge. i also learned too many in the back sucks where i run 4wd. I wanted to build a permanent studded tires and most i see run inner tubes, this is due from drilling studs from the inside out. i didn't want that because i hate tubes. this is what i came up with and so far they are holding up great. they leak very slowly but last all day without any needed air ups. every 5 days i will need to add 5 to 6 psi.