Yes on adjusting for wear, you can use the chalk method to get the best contact pattern.
Yes on higher in the rear for load .
Center tire wear often is the result of a tire being on a too narrow wheel (your 8 inch wide wheels should be fine). Overinflation can obviously do this as well.
Drive from a dry dusty spot onto a paved area while turning slowly and you 'll be able to see how well each tire is contacting the ground by the tracks. You can air often down 3-5 pounds and lessen the wear. 33-35 pounds always worked well on my BFGs on my jeeps.
so i've done some calculations via tire inflation charts and am playing around with 3 possible answers all could be correct assuming how you look at it, hence why i am bringing this to everyone's attention. (
http://static1.1.sqspcdn.com/static/...+inflation.pdf) and here is what i have so far
the tires i previously ran were 235/75/r15 load index;105 Load rating: not sure exactly what the load rating was
i am currently running 31x10.50r15 with load index: 109 Load rating:C
factory tire pressures call for: 33 in the front and 35 in the rear
based off of the table i got that my proper load bearing for the "original tires" was 1886/ibs in the front and 1984/ibs in the rear, now based off of what the chart/example is telling me i found those weights based on the load index on the chart and the tire pressure specified on the plackard of the truck, from there i used the index of 109 to those 2 weights and came up with the same psi bearing load of 29psi in the front and 31 in the rear, (this calculation was found using purely the standard load chart).
why would this be so low? did i do my calculations wrong, if indead these are correct is it wrong to put my tires at this low of a pressure, will i see any issue?, or is this a trial and error type dealio, because i've done my calculations and am coming up with opposite of what has been suggested to me by a few tire company's that i contacted.
now looking at what i have written down on my notebook its seems as if i came up with two other possibilties for tire pressures, one of them was too stay close to the same from what i got between 33-35 in the front and 35-40 in the rear, (this calculation was found by taking 9% of the original load index due to it being a passenger tire (i think it was maybe is was a LT tire i will have to look at my old tires and report back) using the C load range chart for the 31" tire) because i guess i have to account for the difference in passenger tire load rating and a 6ply load rating which my current tires have
i also calculated having up to 40 psi in the front and about 40-45 probably 42 psi in the rear, (this was found by not adjusting for the passenger tire of 9% of the weight of the tire and using the C load range Chart for the 31" tire) i guess with the info provided as well as the chart, could anyone verify what i figured out? i tried calling around but was way to hard to explain over the phone my figures so i am coming to you guys because this not only benefits me but anyone else looking for a concrete or at least close to a concrete as concrete can be answer. this would also be helpful for anyone else looking to verify that their tire pressures are indeed correct when switching tires.
as i look at it, i should solely be using the C load range chart due to my new tire fitting under that category so i guess we can discredit the first conclusion correct or is the first option still relevant? and it seems like 35 psi is the minimum the tire should be running, am i correct in that assumption, if i am in that case would it be smarter to go with my second or third calculation, i am assuming a rougher ride is in store for my 3rd option however can i go wrong with either? (my third option is looking better and better the more i sit and focus on my calculations) and should i keep that 2 psi difference or should i make all tires even?
