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22.5" RIMS, MICHELIN XZL's, AND CTIS

668 Views 16 Replies 4 Participants Last post by  TRUKTOR
I know it has been mentioned on here a couple of times that the 22.5" tires / rims are not suitable for using with the CTIS system, because of the bead profile. The issue is that they would de-bead too easily.

I can't say one way or another, but I noticed that there are a lot of UNIMOGs running around Europe with that set up.
Lots of firetrucks in Germany and France, and some civilian UNIMOGs as well.

It may be that there is a threshold, where they will not deflate the tires as much as the UNIMOGs on 20" rims, I don't know.
The 22.5" XZL's are easy to spot, as they have a distinctive tread pattern with small diamond shaped lugs down the centerline of the tire.
The price has gone up on them - they are about $1500 / tire when I checked today. I didn't spend any time looking for the absolute lowest price as I would if I was actually in the market for them.

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I know it has been mentioned on here a couple of times that the 22.5" tires / rims are not suitable for using with the CTIS system, because of the bead profile. The issue is that they would de-bead too easily.

I can't say one way or another, but I noticed that there are a lot of UNIMOGs running around Europe with that set up.
Lots of firetrucks in Germany and France, and some civilian UNIMOGs as well.

It may be that there is a threshold, where they will not deflate the tires as much as the...
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FWIW, this is paperwork that came with my U500 that pertains to CTIS coding plugs that go into the electronics box behind passenger seat. Noe it relates to 445/65R22.5 and noe the pressures.
 

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U1450L DOKA
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Discussion Starter · #7 ·
Very Interesting. At first glance :

A. The 22.5's referenced are Conti AC70's - Ag tires similar to Michelin XM-47's
B. Looking at the Minimum pressure, the Conti AC-70 is rated the same as the 395/85 R20 XZL's - 1 bar
C. The Minimum on the 365 XZL's is 1.8 bar
D. The Conti AC-70's show the lowest Max pressure, which is not surprising, but I'm surprised that the 365 XZL's are at a higher Max than the 395's, given the stiffness of the sidewalls and carcass of the 395's, as well as the load rating.

So, I might be reading this all wrong, and I did not attempt to translate anything, but it would appear that this indicates that you can deflate 22.5's (at least for the AC-70's) as low as you can the 395 XZL's.

I would think that the 22.5 Michelin XZL's (with a tread pattern specific to that size) would rate differently than the Conti Ag tires.
I think that there must be a similar chart for the current UGE's and UHE's that does show the 22.5 XZL's listed. it would be nice to find that - maybe in the Builder's Books.

Thanks for posting - it is a nice document to ponder.

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Discussion Starter · #9 ·
One thing that stands out with the middle tire (365/85 R20 XZL 164G) is that it has 'mit X18 /15,000 kg' attached to it.
So,' WITH X18 / 15,000 kg.'

The other two tires are 'ohne X18 / 11,800 kg' . So,' WITHOUT X18 /11,800 kg'.

Without the added weight ? Or without the added weight rating ? Or ?

And while the kg numbers are clear enough, I don't know what the X18 might refer to.

Interesting stuff.
 

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Discussion Starter · #11 ·
OK. The X18 appears to be the GVW package optioned.
In looking at the U5000 book, there are X15, X19, & X20 GVW options.
So the tires are being considered with and without the increased GVW package.
 

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Hi, VA means Vorder Achse = front axle
and HA means Hinter Achse = rear axle

the 365/85 and the 395/85 tires have the same built and sidewall strength. The big difference is with the 365/80 MPT series that are much softer. They are also mounted on 20x11 inch rims with a much lower rim edge/ bead profile. The 20x10 inch rims have a higher rim edge/ bead profile. I don’t know about the rims in 22.5 inch size.
Many Mogs with the standard 20x11 inch rims have RDRA so the height of the rim edge/ bead profile is not a criteria I would say. Fact is you can de-bead any wheel without a beadlock much faster than with beadlock with too low pressures and inappropriate driving.
 

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Discussion Starter · #14 ·
I think I should have figured out the VA and HA terminology - I think I was rushing through it, without taking the time to really think about it.
Thanks for clearing that up.
And yes, I was thinking of the 365/80 MPT tires - another mistake.
I think it is time to 'hit the hay'.
 

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I have 3 different CTIS coding plugs. One for 395s with X18 (which I have), VA only goes down to 1.6 bar, HA 2.2.
I usually use the one that is for without X18, VA 1.0, HA 1.9.
Just for slow offroad driving, I have the one on the left which allows HA 1.6.
I have beadlocks In Hutchinsons. Originally, MB “forgot” them in my original 3 piece Lemmerz 116 lb not totally round steel wheels. Despite the fact that they’re part of A31 option which came with A30 (CTIS).
 

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I think I should have figured out the VA and HA terminology - I think I was rushing through it, without taking the time to really think about it.
Thanks for clearing that up.
And yes, I was thinking of the 365/80 MPT tires - another mistake.
I think it is time to 'hit the hay'.
I was already surprised you didn’t pick up the Vor and Hinter Axle ;)

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445/65-22.5 MPT-515 with ~20 PSI/1.4 bar
 
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