Originally Posted by SRM
I have a stock 2012 Sport S with 3:21's. The SR-A's each weigh in at 36 pounds, while the Duratrac 285/70R17 come in at 54 pounds each. That's adding a lot of un-sprung weight.
Assuming I mount the Duratrac's on my stock rims with 1.5 inch spacers, what was the "seat of the pants" loss of power?
I'm in a 2012 Sahara with 3.21's as well. It's a huge difference the first time you drive off on the new tires, like you've got a few extra portly passengers sitting with you. The lower the pressure you run in the new tires, the more rolling resistance there will be.
Play around with the psi until you find the balance you like between rolling resistance and ride comfort. But don't worry, you get used to the new tires after a few days and never look back