Got to try my new bighorns today and had 5 lbs in the front and 4.5 lbs in rear when we started. The ride was smooth over the rocks and good traction. As the day went on noticed that my rears were spinning going up hill. THe tires heated up to 5.5 lbs and lowered to 4.0 and they were fine again. It was a great choice for me to purchase. I kept the org 25" sizes. I highly recommend if riding on rocks and very rough terrain.