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Tire Pressure

2K views 5 replies 5 participants last post by  BillyHW 
#1 ·
New to the jeep world just bought a Sahara unlimited with LT325/65R18 tires can anyone recommend or know the proper PSI for regular road travel the dealer has 45PSI in them now is this right? Thanks in advance
 
#3 ·
I am assuming that your Sahara came with a lift because those are 35" tires. If you have 35" tires, 45 PSI is way too high. Do a chalk or water test, start around 30 PSI and go from there. You are probably going to end up somewhere between 28-30 PSI.
 
#4 ·
45 is way too high for any tire for a Jeep. That is the way they get an extra MPG and raise the fleet average. It is very rare for a light vehicle (not towing or carrying heavy loads) to go above 32-24. I run 28-29 my 35" MTRs...even did with the last set and got awesome wear. out of them. They rode like crap at 37.
 
#5 ·
Why don't you do a reverse load table calculation?

1. Essentially, according to the stock tire size and pressure is on the inside door sticker, look it up on the load tables to find what the load capability is at that recommended pressure.

2. Then, find the load table for your new tire. Work backwards by first finding that same load capability you found in step 1 and then record the PSI necessary to achieve that (or a greater) load capability.

Voila, you've found your new minimum recommended PSI for your new tire.

If the new tire size is not that different from the stock, then your calculation won't show much difference. For example, I tried this when I downsized my winter rims on my sedan, and the equivalent PSI went from 32 (stock) to 31 PSI. So the difference was pretty negligible and I didn't even need to bother with the calculation. Still, it's nice to know that.

However, on Jeeps, often people use very different tire sizes. So the calculation might be more significant.
 
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