what do u guys run on your 21-18 setup i was told 42psi .also what about when u go 2up do u put more in?

 

I haven't bothered with changing psi for two up vs solo, but do make sure you check your tire pressure often. With the lower profile, you will need to make frequent air adjustments. Don't be surprised if you ignore it for a couple of week and find you're running low to mid 30's in your 21/18 Metzeler setup. For me, it's 42 front and 46-48 rear. The rear tire will get real squirrelly if it drops much below that, not to mention the air.