22'5 Semi Wheel upgrade?

[MadMax06]

OK- I currently have 19.5's on my 2006 Mega Cab dually with 245/70 tires and am looking to bump it up a notch to the 22.5 wheels. 2 Alcoa steers and then two 22.5 x 14 super singles in the rear. Question is do our trucks need to be lifted to fit these and if so how much? the rear tires are 445/50/22.5 so I'll get something for the front that matches in diameter. I also don't have the traditional megacab bed. I have a C&M flatbed. Thanks?

 

[brods]

https://www.turbodieselregister.com/threads/251093-Finally-found-some-wheels-and-tires-for-the-girl

 

[MarkEkberg]

I just did it but without the super single. I tried to find the SS but short rubber is difficult to find and expensive.

Running the 255/70 it will fit with no mods and no rub. I had to remove running boards.

The 255 measured to 35" with wear. Not sure what a virgin tire will measure.

 

[MadMax06]

I was lucky to find a pair of 245/50/22.50 super single rubbers with half tread for $200. Just waiting on wheels so I can get them mounted. Thanks. truck looks good. I measured these super single tires and they are 39" tall un-mounted. little worried I might have open the wells of my flatbed some more

 

[MadMax06]

tires 245/50/22.5

 

[BIGNASTY]

I would like to ask a question about your tire choice? Please don't take this as anything other than just a inquiry.


What is the reasoning for going to 22.5 tires? is it the Cool factor?

You need the stronger tire because of the weight that you haul?


Thanks

BIG

 

[mwilson]

Longer wear as well?

 

[BIGNASTY]

Didn't think of that!!

Have thought about the Super-single tires that semi trucks run. I thought that would be unique looking. I don't know that they are made in 22.5 size

I guess if I had read down a few posts I would have answered my own question

 

[MadMax06]

One factor is Yes- Super singles on the rear of a duelly definitely add that cool factor and are tits- The other reason is cost savings- I can find used 22.5's much easier and for much less than I can 19.5's around here. Also the given wear rating is far superior. 10 plys were a joke on this rig especially since I primarily use it for pulling a trailer. The 19.5's 12 ply have held up much better but 22.5's are getting into a whole new ball game for longevity of a tire. The super singles are an L rated tire. 12,800 lbs each. The guy I got them from said if I wear these out with my truck he'll give me another set for free.

 

[MarkEkberg]

For me it was longer tire life, and at times I carry obnoxious loads. The availability of used tires and recaps for short money is a huge draw as well.

The cool factor is nice though.

 

[mwilson]

Not to be a Debbie Downer but this is worthy of mention....I am quite sure that two different back spacings are offered with the aluminum super single wheel. There were premature bearing wear issues using these on the big trucks, Timken even offers heavier bearings for that very reason. You should, if you not already done so, is check your rim to make sure the tire is centered over the hub bearings. If it is not somewhere near centered you may have bearing issues. That is a lot of leverage even without a lot of weight. Plus the adaptor you have to use.could make it worse.

 

[MadMax06]

Not to be a Debbie Downer but this is worthy of mention....I am quite sure that two different back spacings are offered with the aluminum super single wheel. There were premature bearing wear issues using these on the big trucks, Timken even offers heavier bearings for that very reason. You should, if you not already done so, is check your rim to make sure the tire is centered over the hub bearings. If it is not somewhere near centered you may have bearing issues. That is a lot of leverage even without a lot of weight. Plus the adaptor you have to use.could make it worse.

Even with the duals now they are not centered on the hub bearing. don't think this will make much difference- But you are right- They come in a zero offset or a 2" offset.

 

[mwilson]

Just wanted to bring it up. A lot more rolling mass than you had before. I think it will be fine if it is somewhere near centered.

 

[Bob4x4]

Wow that is one big street tire. How much does the wheel tire combo weigh? My little 37x13.50s are pretty heavy

 

[NIsaacs]

With a 39" tire your final drive ratio will have a significant change.

Nick

 

[MadMax06]

With a 39" tire your final drive ratio will have a significant change.

Nick

yes it will- the good part is I have the 4.10 gears so it should bring my rpms down to a good sweet spot

 

[Bob4x4]

yes it will- the good part is I have the 4.10 gears so it should bring my rpms down to a good sweet spot

I have 4,10s and if my trailer was more than an airsteam I would regear with the 37's.The 35's are much better when grades are involved

 

[BIGNASTY]

With a 39" tire your final drive ratio will have a significant change.

Nick

Nick I was wondering the same thing, with computers having so much to do with these trucks what if any does running these GIANT tires do to the truck. Speedo has to be WAY OFF I would think. Pulling power is another thought and the change on Top End Speed and cruising RPM changes not to even mention what the MPG is doing.

 

[MarkEkberg]

That was the other reason I didn't go to a SS. The minimum height was too tall and I would have needed a significant lift which I didn't want to do.

With a 255/70 22.5 I dropped my final ratio to a 3.40ish. Going to a 39/40" tall tire you will drop yours to a 3.0 ratio unless you have 4.10's then it will drop to 3.30ish.

 

[NIsaacs]

Even with the duals now they are not centered on the hub bearing.

Actually duals are centered, one is offset in and one is offset out, for a total of zero. Is your truck a 4x2 or 4x4? I do like the idea of long wear, my 10 ply's melt when I tow heavy. With that much rubber on the ground they might become skates in a heavy rain or snow storm. But I still like the idea of out of the box thinking

Nick