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Moderator: stephan

#559759
Hi to all,

I am thinking about an experiment to install Russian off-road tires 12.00 R20 (Kama 402, Omskshina M-93...) on my Unimog U900 (417.101).
Reasons: (1) those tires are available in Serbia at a reasonable price and (2) bigger overall diameter (1142 +/-8 mm) than the original 12.50 R20.
Purpose of use: light off-road tours

According to the tire manufacturer catalogue, recommended dimensions of the rims are 9x20 (for 12.00 R20). Rims installed on my Unimog 417 are standard 11x20 Südrad.

My first question is can rims from U404 9x20 be installed onto U417 (axles with disk brakes)?

I have investigated a little bit and found that the original rims for U417 should be ET100, while standard rims for U404 9x20 should be ET55?
Also, I found that both vehicles have the same track width of 1630 mm (see pictures of dimensions). It indicates that U417 has wider axles than U404!?

If the above two facts are correct, installation of rims 9x20 ET55 on U417 should result in wider wheels track (2x cca. 45mm = cca. 90mm).
I have tried to simulate the situation in the drawing attached.

Since I do not have experience with Unimogs, I would like to ask for your opinion if this is possible (at least in theory)?

Kind regards, Vucko

*************************************
Deutsche Version (Übersetzt von Google)

Hallo,

Ich denke über einen Versuch nach, russische Geländereifen 12.00 R20 (Kama 402, Omskshina M-93...) auf meinem Unimog U900 (417.101) zu montieren.
Gründe: (1) diese Reifen sind in Serbien zu einem vernünftigen Preis erhältlich und (2) größerer Gesamtdurchmesser (1142 +/-8 mm) als die ursprüngliche 12,50 R20.
Einsatzzweck: leichte Offroad-Touren

Laut Katalog des Reifenherstellers beträgt die empfohlene Dimension der Felgen 9x20 (für 12.00 R20). Auf meinem Unimog 417 verbaute Felgen sind Standard 11x20 Südrad.

Meine erste Frage ist: können Felgen von U404 9x20 auf U417 (Achsen mit Scheibenbremsen) montiert werden?

Ich habe ein wenig recherchiert und festgestellt, dass die Originalfelgen für U417 ET100 sein sollten, während Standardfelgen für U404 9x20 ET55 sein sollten?
Außerdem habe ich festgestellt, dass beide Fahrzeuge die gleiche Spurweite von 1630 mm haben (siehe Bilder der Abmessungen). Es weist darauf hin, dass U417 breitere Achsen hat als U404!?

Wenn die beiden obigen Fakten zutreffen, sollte die Montage von Felgen 9x20 ET55 auf U417 zu einer breiteren Spurweite führen (2x ca. 45 mm = ca. 90 mm).
Ich habe versucht, die Situation in der beigefügten Zeichnung zu simulieren.

Da ich keine Erfahrung mit Unimogs habe, würde ich gerne nach eurer Meinung fragen, ob dies (zumindest theoretisch) möglich ist?

Grüße, Vucko
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#559768
Dear Vucko,

I think it will work as you described. But the force on the wheel beering and the steering knuckles will be increase. Also the steering angle might be reduced.
Do you want to buy a extra set of rims. On other tire brands also your 11x20 Rim can be used for 12.00 R 20 as well as 12.50 R 20 tires.
#559776
Hello Jürgen,

Thanks for the reply and advice.
I understand that pressure on wheel bearings and other elements will be increased but since I will not carry a lot of load, I believe it will not cause extra problems in future exploitation. I am about to replace the originally installed Heavy Duty springs with a softener variant, since my 417 is very rigid without any load - almost no suspension. It behaves like a tractor :roll:
Picture of my Unimog is attached. I am about to start with renovation.

Anyhow, let's get back on the tires…
Currently, I have installed Continental MPT80 12.50 R20, in good condition.
However, I would like to have a little bit more aggressive tire pattern and a little bit bigger diameter if possible. The 14.50 R20 will be the perfect solution.
Ex-Soviet's type tires for off-road (and military vehicles) shown OK in our off-road conditions, so I am considering them as an solution. Unfortunately, the most of those "Russian’s" type tires are available in sizes 12.00 R20 or 14.00 R20.
Only a few tires exist in size of 14.50 R20 and are very difficult to find (e.g. Dneprashina Snaga DT-64).

The 14.00 R20 is too big (requires significant modification on Unimog), so 12.00 R20 could be an option. Additionally, the price for the 12.00 is not so big :D

Then… Since the 12.00 R20 is narrower than 12.50 R20, I have started to consider to find narrowed rims, too – the 9x20 from U404.
However, If you claim that 12.00 R20 could be mounted on my original 11x20 rims, I should think about testing that option first. I have a spare rim 11x20, and I can find used 12.00 R20 for test purposes only.

I worrying now what Gerog said in the post above :? – the Russian’s type off-road tires require the “three pieces rims”, as it is originally used on ex-Soviet military trucks!?
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#559777
eu1700 hat geschrieben: 20.01.2022, 13:10 hallo Vucko,
the Rims do not fit to this Tires, you need Rims in 3 Peaces ftom Truck.
Gruß Georg
Thanks Georg. I di not think about that aspect :?
You are talking about old rims type with two rings like on the picture attached...
I have to check if those tires can be mounted on standard modern Unimog rims.
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#559778
Dear Vucko,

yes, I also have seen Georg article. This i can!t answer in detail but if you have the possibility to test it might be good.
But I know from some TruckTrial collegues using russian military truck tires on their Unimog standart rims.
#559790
Hello Vucko
for using truck tires, you need rims 10V20. This rim type was mounted at my 417, when I bought it.
Type 10V20 shoulder is higher than sdc type 11-20 for mpt types.
Part number ist 427 401 01 01, offset is 82mm.
#559795
Helmut-Schmitz hat geschrieben: 20.01.2022, 21:58 Hello Vucko
for using truck tires, you need rims 10V20. This rim type was mounted at my 417, when I bought it.
Type 10V20 shoulder is higher than sdc type 11-20 for mpt types.
Part number ist 427 401 01 01, offset is 82mm.
Nice to hear you Helmut!
Yes, probably you are right. Those rims are the right option for 12.00 R20 tires. I am afraid that I will not find it here in Balkan countries.
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#559800
Hallo Vucko
These rims are the only option and are very rare as well.
This is why they are particularly very popular at the Unimog travel people .
Because the rims are very heavy and the 13.00R20 tires which had been mounted are very heavy but also very hard, I changed them for 14.00R20 on 11-20SDC.

Diese Felgen sind die einzige Option und sind sehr selten.
Diese sind in der Unimog Reise-fraktion sehr begehrt.
Da die Felgen und sehr schwer sind und die Reifen 13.00R20 die bei mir montierten waren nicht nur schwer sondern auch sehr hart sind, habe ich diese gegen 14,R20 auf 11-20SDC getauscht.

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