QUESTION: any problem adding larger front tires?

[slowzuki]

I'll attach my Kubota L5030 spreadsheet I made something like 10 years ago. The mechanical ratio is listed for an L5030, its different for different tractor models, can't assume this number!

View attachment R1W comparison for Kubota L series.pdf

Hmm, seems to be missing the calculator part but you get the idea.

 

[Recoveryhill]

This comment, and the last, were uncalled for, unnecessary, and insulting. There's simply no need for that, whether you like the way someone types, or what they have to say, or not.

Excuse me while I blow milk from both nostrils laughing. GManBart post February 6 at 11:57PM, this thread: "Over and out? It's one or the other, not both....both makes you look look like a 70s sitcom, and that isn't a fate any TBNer deserves."

BTW, I'm a 60's sitcom.

 

[JDonly]

So, if the rear is higher than the front, could you get by with no fuel? :laughing:

This is pure GENIUS!

 

[Travis_R]

Just picked up a new Massey 1648. <img src="http://www.tractorbynet.com/forums/attachment.php?attachmentid=359135"/>

You lucky dog you! :laughing: My dream tractor! How do you like it so far?

 

[TSO]

You lucky dog you! :laughing: My dream tractor! How do you like it so far?

Thanks! So far so good. I'm liking the cab for sure, and the auto throttle is probably my favorite feature.

Just got a surprise hour of seat time on her ... got back from a long trip and had to spend an hour getting my truck & trailer unstuck in my driveway ... got sucked into a snow bank from all the snow and I want home to plow it.

Just what I wanted to do after 16hrs of driving. But, at least I had a heated cab & radio.

 

[TSO]

Okay tire-math wizards... riddle me this:

I currently have 14.9x24 rears on 12" wide rims. I've asked around but can't find an answer yet... can't find a dealer that will answer it so far. Can I fit 17.5Lx24 rears on these rims? They are roughly the same height, just wider. Part 2 of that... IF they fit the 12" rims, will they change the overall height, and if so, by how much? Part 3 of that, IF they change the the overall height, would that affect the ratio enough to need to change to 12x16.5 fronts instead of the 10x16.5 ?

2nd question as an alternate: Will 16.9x24's fit on my rear 12" wide 24's ? Is the ratio of the 16.9x24 rears to 12x16.5 fronts, the same ratio as 14.9x24 rears to 10x16.5 fronts ?

 

[ovrszd]

Boy, that's a lot to absorb TSO.

This usually starts a lengthy discussion with varied opinions.

My opinion about changing tire size is that it definitely changes the stresses put upon the driveline. Would you consider putting different sized tires on one axle of your 4x4 truck without changing the other 2??

As to the rim width issue. You can mount almost any tire on almost any width rim. How the tire reacts is the issue. If the larger tire is recommended to be on a certain width rim, I say that's what you should use. Again, there will be plenty of discussion about this as well.

 

[CalG]

This thread is leading to the inevitable. Opinions.....

While it is true that theory and math regarding rolling diameters, gear ratios and "stress" might be considered, the big unknown is SLIP. Something that every tire experiences while performing it's task. And this goes for automotive as well as industrial and ag usage.

MY Opinion? (not that it matters) Put ANY size tire and wheel you want on your rigs, but just be mindful of how much "chirping and snatching" of the drive line is going on.

If there is none, then there are no unresolved stresses. (NO PROBLEMS) If there is a lot of jerky motion on what ever surface you are operating on, That's not good, and something needs to change.
For me, the surfaces that offer conditions where slip is inhibited and stresses due to rolling radius would be present, do NOT call for FWD. Disengage! just like the operting hand book describes!
Same as using the dif lock. (Someone please tell me why FWD is needed on hard surfaces for loader work. I have not found this to be consistant with my experience)

It's all just common sense ;-)

 

[skyhook]

My L4200 is similar to the OP's question, except the reverse.
I bought this tractor with "28's" on the rear and 16" on front.
The tractor call's for "24"s on the rear.
The rear tires are almost done and will have to be replaced.
Never had issues.

 

[RG1]

My L4200 is similar to the OP's question, except the reverse.
I bought this tractor with "28's" on the rear and 16" on front.
The tractor call's for "24"s on the rear.
The rear tires are almost done and will have to be replaced.
Never had issues.

It looks like you have 13.6X28's on the rear? If so, they are almost the same size as 14.9X24's. Like I posted earlier in this thread, when I bought my JD 4500, I had a choice from the factory of 13.6X28 or 14.9X24 for the rear, and both were mated to 8X16 fronts.

 

[TSO]

Sorry, duplicate post

 

[TSO]

Yeah, you guys are talking AG tires, which are typically narrower than R4's anyhow.... I believe. I "emailed" a question into Titan Tire, but I'm still waiting for their response. I guess my main question now, is whether or not it would be "OK" to use 12" rims for the 17.5Lx24's.

Does anyone know if these 24" rims are STANDARD for the different tractors? Are the bolt patters & bore the same? (I'm talking about industry-wide.... different brands included)

 

[RG1]

Yeah, you guys are talking AG tires, which are typically narrower than R4's anyhow.... I believe. I "emailed" a question into Titan Tire, but I'm still waiting for their response. I guess my main question now, is whether or not it would be "OK" to use 12" rims for the 17.5Lx24's.

Does anyone know if these 24" rims are STANDARD for the different tractors? Are the bolt patters & bore the same? (I'm talking about industry-wide.... different brands included)

Yes, usually, the R1's are narrower, but a 14.9 R1 is just about the same exact width as a 14.9 R4 provided they came from the same manu.

I believe you can use your 12" rims, but the 17.5's will be rounded up in profile more, which will make the machine ride on the center of the tread, and wear that area faster more. I believe someone else already pointed that out, and they were correct. Also, making the tires more rounded in profile will increase the PSI of the contact area on the ground, which will basically negate and small increase in flotation, and will decrease traction a bit. It will also affect the ride and longevity of the tires to some degree because the tire's sidewalls will flex and carry the load differently than they are originally designed to do. How much is only a guess right now.

 

[skyhook]

Yeah, you guys are talking AG tires, which are typically narrower than R4's anyhow.... I believe. I "emailed" a question into Titan Tire, but I'm still waiting for their response. I guess my main question now, is whether or not it would be "OK" to use 12" rims for the 17.5Lx24's.

Does anyone know if these 24" rims are STANDARD for the different tractors? Are the bolt patters & bore the same? (I'm talking about industry-wide.... different brands included)

17.5Lx24 would require a 15" width rim, 12 inches would be to narrow.

RG1, My rear tires are 12.4-28's on 12' inch wide rims.
Although I am considering on getting 14.9-28's for them.
It seems I can get by on 12" width's with those,(according to the chart) although they do recommend 13".

 

[DarkBlack]

All valid points. The tractor's drive ratio is constantly changing depending on conditions. And in most cases those conditions include soft terrain that allows the tires to slip enough to compensate for the ratio when it's out of the normal range. And to me, reinforce that 4wd should only be used when needed. And very cautiously when engaged on hard surfaces that don't allow the tires to easily slip.

The misunderstood interesting technical point I was hoping to "steer" some people toward, was the common misconception of tire diameter being valid on AG tractors for linear travel calculations. The overlooked fact being: In soft ground, either mud or snow, the tire is actually moving on the ( radius- lug height ), where on hard surfaces it's closer to ( tire carcass + 3/4 lug height ). That's even an oversimplification not factoring in mass and tire deflection.

 

[ovrszd]

The misunderstood interesting technical point I was hoping to "steer" some people toward, was the common misconception of tire diameter being valid on AG tractors for linear travel calculations. The overlooked fact being: In soft ground, either mud or snow, the tire is actually moving on the ( radius- lug height ), where on hard surfaces it's closer to ( tire carcass + 3/4 lug height ). That's even an oversimplification not factoring in mass and tire deflection.

It's valid for AG tractors as well. If the front tire is sinking into the soft ground, then the rears are as well. Farmers that I know with FWA tractors pay close attention to tire size and even tire air pressure.

 

[TSO]

Ok, so ... anyone know if the rims are industry standard for sizing (bolt & bore)? That would make it easier if I chose to find 15" wide rims.