Tractor Sizing Case Farmall 75c with R4 tires

[MtnViewRanch]

I don't understand why you want to "low ride" your new tractor, but if you use your imagination, you can see the small-tired tractor in your mind. I did not look up any tire sizes but if your chosen tires are 12 inches shorter than stock, the tractor will sit 6 inches lower. That means 6 inches less ground clearance, and 6 inches less tire in the fender well. This also means a 6 inch lower center of gravity and significantly lower gear ratios due to shorter tire rolling distance. It also works the same (but opposite!) way when going to a taller tire.
On a 4wd tractor, you want to keep the same size ratio differences between the front and rear tires to keep from binding (and possibly breaking) front axle, drive shaft, and/or transfer case, and also to keep the tractor sitting level (this last part also applies to 2wd tractors too). Good fortune!

Scott

Scott, maybe having the R4s are going to give him a lot more puncture resistance and better wear vs the std AG style tires for what he is working. Yes you can get heavy duty AGs with as much or even more puncture resistance, but at a serious price hike I believe. I believe that the manufacture has the ratios figured out. These are all std tire configurations that would come on the tractor, nothing for the OP to figure out other than what size pre determined combo he wants to go with.

If it were me and going with the R4s, I would go with the 19.5L setup.

 

[w1ebb]

Brian, I don't remember recommending ***any tires*** to the gentleman. I do remember giving advice on how tire height will affect and fit a vehicle. And I remember giving a reminder about keeping tire ratios close just in case the gentleman went to an aftermarket supplier for his tires. I don't remember any of the other stuff.....

Scott
M.Eng; MSW

 

[GManBart]

Brian, I don't remember recommending ***any tires*** to the gentleman. I do remember giving advice on how tire height will affect and fit a vehicle. And I remember giving a reminder about keeping tire ratios close just in case the gentleman went to an aftermarket supplier for his tires. I don't remember any of the other stuff.....

Scott
M.Eng; MSW

Brian didn't say you recommended any particular tires, so it's hard to tell what your post was supposed to mean. When he mentioned that the manufacturer has the ratios for different tire sizes already established, he was politely pointing out that your comment about size ratios was irrelevant. The OP is looking at buying a new machine, and he's looking at the factory tire size choices, not changing them after-the-fact with an aftermarket supplier.

Your post started out by commenting about why the OP wants to "low ride" his new tractor....paraphrasing, of course. Brian responded saying that maybe the OP was asking about R4s for their superior puncture and wear resistance. That's a valid observation. The OP never said he was trying to lower the ride of his tractor, he just said that by opting for R4s the machine would be lower, which it will be. Whether that's good, bad or neither depends on the intended uses, and I don't think the OP spelled that out in detail.

You know how you can tell someone is an engineer? You don't have to....they'll tell you soon enough.

 

[w1ebb]

Hey GBartMan, I didn't mention anything about tire types, but it read like Brian thought I did because he addressed his thoughts and concerns to me. I stated what tire height does to a vehicle. If the gentleman installs tires short enough to lower his tractor the 6 inches he stated, it could conceivably cause some problems in certain situations, i.e. high centering situations. As far as "low riding his tractor," a 6 inch height reduction is a long way down, hence, it could be said to " ride low." I never said Brian's advice was inadequate, for I thought he was absolutely correct. It needed to be made to the gentleman buying the tractor, not to me.
Twenty two years ago, I worked in an industry where I had to take the multi-million dollar machines that "engineers" designed and make them work. Very often it would take *years* to make it work right while its designer sat in his air conditioned office scratching. It only took me 16 years to figure out that wasn't for me. But now, because if that experience I can now comfortably say, "I have for so long, done so much, with so little, that I am now qualified to do anything with nothing." LOL!

Scott

 

[retiredwill]

Thanks for all the comments. This has turned into quite an interesting discussion. My goal is not to create a low profile Tractor. I actually prefer a Tractor that sits up high. It's all about buying a Tractor I can use year round for various tasks with minimal impact on turf. There is no question that an R4 tire is less agressive on turf than any R1 tire. I had even considered buying a Tractor with more standard R1 tires and switch to turf tires in the spring when I need to do some heavy mowing rain or shine. Investing in four turf tires and rims is not exactly cheap. I was hoping that an R4 configuration is a middle of the road solution. This new Tractor will replace a big older IH 1086 and a NH TC 33D. I do not use the Tractors for tasks that require R1 tires. I'm also looking at a Kubota M7060. Again, thanks for all the comments.

 

[TSO]

Thanks for all the comments. This has turned into quite an interesting discussion. My goal is not to create a low profile Tractor. I actually prefer a Tractor that sits up high. It's all about buying a Tractor I can use year round for various tasks with minimal impact on turf. There is no question that an R4 tire is less agressive on turf than any R1 tire. I had even considered buying a Tractor with more standard R1 tires and switch to turf tires in the spring when I need to do some heavy mowing rain or shine. Investing in four turf tires and rims is not exactly cheap. I was hoping that an R4 configuration is a middle of the road solution. This new Tractor will replace a big older IH 1086 and a NH TC 33D. I do not use the Tractors for tasks that require R1 tires. I'm also looking at a Kubota M7060. Again, thanks for all the comments.

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