Tire pressure for larger tires.

[Sbrad]

I upgraded my tire size on my Rebel from the 275/70/18 to 285/75/18. I have two questions following this upgrade. What tire pressure to run with the new size? I ran the recommended 55/45 pressure on the previous set and got 67,000 plus miles on them. Secondly, I need to calibrate the speedometer and the TPS’s. Dealership or purchase a OBD? Thanks!

 

[mplaramie]

I upgraded my tire size on my Rebel from the 275/70/18 to 285/75/18. I have two questions following this upgrade. What tire pressure to run with the new size? I ran the recommended 55/45 pressure on the previous set and got 67,000 plus miles on them. Secondly, I need to calibrate the speedometer and the TPS’s. Dealership or purchase a OBD? Thanks!

Purchase an OBD like Alpha or Jscan. If you do, you will need the Chysler SBC.

For the tire pressure, do a chalk test. This way you get the tire pressure perfect for your Ram.

 

[Sbrad]

Purchase an OBD like Alpha or Jscan. If you do, you will need the Chysler SBC.

For the tire pressure, do a chalk test. This way you get the tire pressure perfect for your Ram.

Thanks, I just ordered the VLinker MC+ along with the cable. Still reading about the chalk test.