tire sizes

[BX_that_could]

i've searched (when the search feature here works) and can't really find an answer to my question... so please forgive me if it's been covered before.

i have a BX1850 and i'm wanting to put lug tires on instead of turf tires for the coming winter.

the dealer told me that i can't put a different size tire on the tractor or it will void the warranty... which i can understand and also understand that different size tires on the front and rear (different from OEM) can damage the differential...

however... and here's the question...

the 1850 has 24 inch rear tires and 16 inch front tires...

what and / or why would it hurt to jump up in tire size as long as the increase was the same on the front and back?

an example would be going to a 26 inch rear and an 18 inch front would be an even increase...

thanks for your help in advance!!!

 

[lp333]

Because the front wheels on your BX1850 (or BX22, BX23, BX24, or most other models... ) have a smaller circumference than the back wheels, they must rotate faster than the rear wheels to cover the same distance.

If you do the math for the original wheels on your BX1850, you will see that the ratio between the rear and front wheel circumferences is about 1.5. In other words, the front wheels are turning at about 1.5 times the speed of the rear wheels to cover the same distance.

Now, if you were to go with the new sizes that you suggest in your example, you would find that the ratio between the two new circumferences has changed a little bit - not that much, but perhaps enough to cause stress on your differencial when you are in 4WD mode. In fact the new ratio between the rear and front wheel circumferences would now be closer to 1.4.

 

[irwin]

Hi BX,

There's a lot of info on this subject. Here is a link http://asae.frymulti.com/data/pdf/6/crt2004/Lecture28.pdf. that will answer some of the questions about why..To find the needed tires in the desired tread, you'll need to know what rims are available, the rolling circumference of the tires and, you'll need the 4wd ratio of your tractor.

Here's a thread on my search for my tractors mfwd ratio, changing from R3 tires to R4's...http://www.tractorbynet.com/forums/...0-770-mfwd-ratio-r4.html?highlight=mfwd+ratio..I know it's not the preferred orange color of this forum but......as far as I'm concerned we care about tractors, before we care about brand.

 

[Jim1764]

Does anyone know what the front/rear drive train ratio is for a Kubota L3710 GST? I called my local Kubota dealer today and spoke with the service department and owner and was told that Kubota does not give out this info to dealers.

Thanks,
Jim

 

[john_bud]

Jim,

Search the board here, it was discussed about a year or two ago.

jb

 

[Reg]

i've searched (when the search feature here works) and can't really find an answer to my question... so please forgive me if it's been covered before.

i have a BX1850 and i'm wanting to put lug tires on instead of turf tires for the coming winter.

the dealer told me that i can't put a different size tire on the tractor or it will void the warranty... which i can understand and also understand that different size tires on the front and rear (different from OEM) can damage the differential...

however... and here's the question...

the 1850 has 24 inch rear tires and 16 inch front tires...

what and / or why would it hurt to jump up in tire size as long as the increase was the same on the front and back?

an example would be going to a 26 inch rear and an 18 inch front would be an even increase...

thanks for your help in advance!!!

You're OK as long as you keep the rolling circumferences in (approx) the same ratio.
BTW, the front should "lead" the rear - a little, there is a recommended percentage for this, but I don't remember it off-hand, or a source for it.

There is a lot of misunderstanding about this - basically you can forget about the folk who tell you the center diff will blow out.
Errr, ***_u_ming that you don't drive in 4WD on hard pavement and make sharp turns.
Like, why WOULD you ?
Why would ANYONE ?
(-:

 

[BX_that_could]

thanks for the information!!!!!

armed with that, i was able to find this article with the formulas needed:

Can I use a different size tire on my 4wd tractor

again, thanks!!!!!!!!

 

[lp333]

BX, it's good to hear that you now feel properly armed with the knowledge that you need to make a sound decision. Good luck in your choices. Don't forget to keep us posted on future developments.

As you see, some of the differences in the circumference ratios for the new tire sizes are quite small. In that event, there would be little or no risk of damage to your BX. The greatest chance for stress (or possibly damage) to your BX would occur with a significant change on the ratio, and only if you were operating in 4WD mode on a hard surface.

 

[IdahoTractor]

Because the front wheels on your BX1850 (or BX22, BX23, BX24, or most other models... ) have a smaller circumference than the back wheels, they must rotate faster than the rear wheels to cover the same distance.

This has got me curious. Do 3/8" chains on front and rear tires affect tire rotation/gearing to any significant degree? I'm assuming that it doesn't given the wide use of traction chains on tractors.

 

[Renob]

BX,

I had a BX2230 with turfs that I used in Upstate NY winters. Turf tires are actually very good in the snow. I really can't think of a situation where bar tires would make enough difference to bother with a switch. If the snow got deep enough to stop the turfs you would be buried no matter what tire you had.

Just my 2 cents.