Ladies end Gentleman, I (miss)use a freedom to present you my version Unimog U423 in 1:17.5 scale to fit future models that I plan to built. (At the end I have decided to make models in 1:15 scale)   Since introduction of new Unimog Implement carrier, I was very impressed with possibility to make my own LEGO Unimog Implement carrier that would fit my other models in proper scale. At that moment all my models were something in between 1:16 or 1:17 Scale and like @Bricksonwheels nicely said once truth is always somewhere in between. Then rumors about new tractor tire started to fill the comments here on Eurobricks abnd because most of my mocs are tractors some things got upside up. First question was - what can I do and make decision for future models and which scale to use...After a while i remembered my good friend Ingmar ( @2LegoOrNot2Lego... ) and his U.S. trucks since LEGO produces 62.4 x 20 Truck tires in some respected range of years so far, and set 42043 (one of my favorite) is still assembled. So I take a look around  what was not so difficult, since I drive some 100 miles every day because of my daily job and started documenting trucks and tires on them. After seeing that some tire dimensions are always repeating I've decided to look at on-line brochure and ask tire sellers to see which is the most common tire dimension. The result (currently) for European built trucks was tire with approximately 1100 mm overall diameter ( mostly 315/80R22.5) and for U.S trucks this is 43.2" (which is also approximately 1100 mm for 11R24.5 tire). So when you want to calculate you would end up with following scale 17.5 (1100 / 62.4). So every truck can be represented with that tire which has very good steering capabilities and grip level is (for me) satisfying. Finally I can make Unimog that has all characteristic features for this vehicle; portal axles, all wheel drive with central differential...like on image ...and then the shock - I could not integrate hub reduction based on gear 16 tooth and gear 8 tooth partially inside wheel... well back to the drawing board and I felt like Wile E. Coyote   After several month of brainstorming I've decided to buy this wheel (which is actually quite expensive) and what a pleasant surprise Portal axle hub fits nicely inside this wheel (wheel from set 5571). The only problem was that 68.8 X 24 tires are to soft for planned weight on Unimog, so I have to think about something in the future, but major problem was solved and development of Unimog for living room can start.  My goal was to make something like this versions with some 175 mm wide mudguards which gives about 18 studs overall width for model.   Currently you can see front axle which should probably be redesigned to make some 2-3 studs "gap" between tires and mudguard and a Wheel that will be used for Unimog. At the moment I did not decide to make short or long version (long version has enough space to use central differential). Model dimensions: - length 40 studs - wheelbase (probably) 26 studs - height 23 studs - width 18 studs

  Model should have this features:  - all wheel drive - fully independent axles with 4 links suspension - portal hubs - front wheel steering - in - line 4 cylinder fake engine - cab tilting - hood opening - door opening - motorized front and rear pto - preparation for additional attachment or platform... (motorized) Current images are here (but due to free time I doubt that I'll be able to make a video) Please make your suggestions, comments, criticism and admins do not hesitate and correct or warn me for everything that is not correct with Eurobrics rules. (After few years of building this models, I have decided to make all models in compromise scale 1:15, of course if something new in term of tires does not come up from LEGO...)