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All we are saying is that the common 8.25x22.5 truck rims are too wide for the equivalent 9R22.5 or 8R22.5 tires which will use rims in the ~6" and ~5" range respectively.
The standard 8.25x22.5 rims will fit 11R22.5 wheels, but they are likely going to be too wide for the duals and steering.
Here is a picture that may help show equivalency from the 20" to the 22.5" tires
So, you start with the wheel offerings on your F5 (largest being 8.25-20) which translate to 9R22.5. Now you need to find a 22.5 rim to fit a 9R22.5 which optimally would be 6.75 inches (some tire manufacturers stretch this from 6 to 7.5 inches). The ubiquitous 8.25x22.5 rims will not be appropriate.
All we are saying is that the common 8.25x22.5 truck rims are too wide for the equivalent 9R22.5 or 8R22.5 tires which will use rims in the ~6" and ~5" range respectively.
The standard 8.25x22.5 rims will fit 11R22.5 wheels, but they are likely going to be too wide for the duals and steering.
Here is a picture that may help show equivalency from the 20" to the 22.5" tires
So, you start with the wheel offerings on your F5 (largest being 8.25-20) which translate to 9R22.5. Now you need to find a 22.5 rim to fit a 9R22.5 which optimally would be 6.75 inches (some tire manufacturers stretch this from 6 to 7.5 inches). The ubiquitous 8.25x22.5 rims will not be appropriate.
Correct, but keep in mind 8R22.5's are no longer available in today's normal tire market...and the 9R22.5 will work on a 7.50 wide rim but no larger.
Okay all clear now, i have to get a set of 7.50x22.5 rims at the yard. should be easy. (Yeah No Chance)
Contact a commercial tire disrubuter if you have one near you...like Goodyear or Pomps. They usually have stockpiles of rims including 7.5x22.5's
The tires you might get lucky and find a set...otherwise it will have to be new, not cheap at all but will last 100k miles on one of these trucks!
If your yard has a large supply like you believe you’d be even better to look for 6.75” wide rims. I’ve read that even they can rub up front. Width will be stamped on the rims. There are standards published by the Tire and Rim Association for dual rear wheel spacing for each tire size. These specs should be honored when you do the math calculating offset and backspace of the newly built wheels. Stu
If your yard has a large supply like you believe you’d be even better to look for 6.75” wide rims. I’ve read that even they can rub up front. Width will be stamped on the rims. There are standards published by the Tire and Rim Association for dual rear wheel spacing for each tire size. These specs should be honored when you do the math calculating offset and backspace of the newly built wheels. Stu
I personally only have 4 built so far as I have not searched for two more 22.5's yet. I was actually leaning towards finding a set of 19.5's to just put on the front. Then I get the better top speed out of the rears but get the clearance and stance out of having smaller wheels on the front.
Okay expect rubbing, if it rubs i can just sawzall off the part it rubs on as my front clip is wasted and every panel of it has huge rot holes in it so i wont feel bad cutting it for clearance.
When you build the other 2 keep us updated, i will be waiting that long anyways for time to do this project and your results will determine if i do this use or daytons.
Just reread this whole thread and do the tires really last 100k miles or is that a typo?
if it is true i might splurge for some better used tires for the wheels.
Just reread this whole thread and do the tires really last 100k miles or is that a typo?
if it is true i might splurge for some better used tires for the wheels.
Well, on a school bus which is stop and go and lots of turning and about 20k pounds...I can get 60-70k miles out of a set of rears and a good 50k on the steers. I would just be guessing, but these trucks are much lighter, so I would think 100k would be acheivable. Honestly they will probably dry rot before that.
The rubbing will be against the frame. I was not about to make 6 wheels so I made 12.25 x 22.5 rear wheels and 8.25 x 22.5 fronts. The fronts are offset to move the tire out like you'd find on something running 315 on 9 x 22.5 front tires. I needed as much tire diameter as I could reasonably put on to get the engine RPM to where my Cummins was happy. Running 385/65-22.5 rears and 275/80-22.5 fronts. That is over an inch diameter difference but I knew I was not going to fit 11R up front. The fronts just rub the spring perch rivets at full lock so they have a nice polish on them. 12.25 x 22.5 welding
