gofastlvr

Looks like I'm going shopping!

carter38

I shave them down all the time. My last F-450 had 22's on 37 Toyo M/T's and rode awesome. The 22.5's will beat you to death and tear your truck apart.

Questofpower

As said the unsprung weight is the main issue, but you can really drop your air pressure by quit a bit, most big rigs run at 100psi because it is easy to remember, but if you look at a load and inflation chart they only need 85psi to carry the load. I am guessing you are running 255/70R22.5 (load range H 16ply) what tires you run do make a difference as mentioned somewhere around 60-70psi will tame your ride a little bit, I wouldn't think you would see a lot if irregular wear at those pressures. If that is the size you are running at 80psi you have the carrying capacity of a little over 16,000lbs on the back axle alone, not sure what the axle is rated for but I am guessing not that much ( I am sure someone will kindly correct me if I am wrong). The other option is to cut your rims down 22" like all ready mentioned, any machine shop should be able to do it remember you are only taking off a 1/4" all the way around. I I have seen a lot of guys do this seeming without issues. Conversely, I also see a lot guys cutting down ford 20" factory wheels to 19.5" so they can run true commercial tires.

If you want PM me and I can get all your weights and tell you the optimal air pressures, for steer and drive.

ChargeIt

Actually, running the tires over inflated for the load being carried; ie 100psi unloaded - will cause uneven wear.
Tires will bald in the center if over inflated for the load being carried.

I have that even with my stock LT tires. TPI warning is set too high for unloaded (per govt regulations in 2007) so a person has to either live with the warning light or get the BCM reprogrammed.

Take Questforpower's offer to set you up properly.

[email protected]

I've got a lifted 2009 duramax 22.5 I run 50psi in front tires and 40 in the rear and it rides pretty dn good!

FIXX

iTrader: (2)

+3 drop the air pressure in the tires,,it reads MAX PSI...with a minimum of 35 psi and a max of 120 psi running the tires inbetween will not hurt the tires,,i have a friend that also runs 50 psi all the way round on his,,80 k on the tires and they still look gr8..

DirtyMoney

Bilstein shocks make a huge difference. In the case of tires air down to 60 psi. You can shave down to 22's but tires wont last long and 19.5's would be a better option.

Pokher Ace

I run 35psi front and 30 rears unloaded and get a good ride. I had a hard time getting them balanced right and after a ton of research ended up getting centering pins, even though there bore centric it still made a huge difference. Some big rig shops carry them so you can try them out.


http://www.tru-bal.com/products/solu...olution.a.html

Questofpower

+2 on the centering pins, we use them on every truck we do, you can even go a step farther and use a skirt nut or a centering pin that stays on the truck (this helps prevents clocking), both devices take out the stacked up tolerances on the hub and the hub piloted wheels.[ATTACH=CONFIG]513580[/ATTACH] I can get the centering pins if anyone needs some. The nuts you can buy online for fairly cheap.

HiPerf360

It has more to do with the stiff sidewall tire than the unsprung weight. Look up the effective spring rate of your tires vs. a standard 22" tire.