Installed 1 new tire but different height from original

[keithcoady]

I have a B7800 and had a split in the sidewall of one rear tire. Tractor is about 10 years old with 482 hrs. After checking on a few options I decided better bang for the buck to replace the tire.

The new tire came mounted on a new rim and after installing it I realized it was a fair amount higher than the other rear tire. More wear apparently on the original tires than I thought.

So question is, am I going to mess something up with two different diameter tires on the rear? Both are 13.6-16 tires but the wear on the other one sits the tractor noticeably lower on that side.

Can I change the air pressure in the tires to try and equal the same height or do I need to install 2 new tires (scary thought as the new one set me back $600 CAD dollars)

Also, after installing the new tire and torquing the wheel nuts I checked the air pressure which calls for 14psi on the rears and 22 psi on the fronts. The new tire had 28psi!!

I dropped the pressure to 14psi naturally but was curious if the reason they shipped it with that much pressure was to insure the bead kept it's seal during shipping. That's only an uneducated guess as I'm a newbie (1 year) tractor owner.

Any knowledgeable people have suggestions/opinions on this?

Thanks in advance for any suggestions, etc.

Keith

 

[85Hokie]

I have a B7800 and had a split in the sidewall of one rear tire. Tractor is about 10 years old with 482 hrs. After checking on a few options I decided better bang for the buck to replace the tire.

The new tire came mounted on a new rim and after installing it I realized it was a fair amount higher than the other rear tire. More wear apparently on the original tires than I thought.

So question is, am I going to mess something up with two different diameter tires on the rear? Both are 13.6-16 tires but the wear on the other one sits the tractor noticeably lower on that side.

Can I change the air pressure in the tires to try and equal the same height or do I need to install 2 new tires (scary thought as the new one set me back $600 CAD dollars)

Also, after installing the new tire and torquing the wheel nuts I checked the air pressure which calls for 14psi on the rears and 22 psi on the fronts. The new tire had 28psi!!

I dropped the pressure to 14psi naturally but was curious if the reason they shipped it with that much pressure was to insure the bead kept it's seal during shipping. That's only an uneducated guess as I'm a newbie (1 year) tractor owner.

Any knowledgeable people have suggestions/opinions on this?

Thanks in advance for any suggestions, etc.

Keith

THe only problem you will have is when you are in 4wd - OR with you use your diffy lock (it will pull to one side) , air pressure will have little effect on this, UNLESS you can lower the tall tire to the same rolling circumference as the other tire. This would be asking the near impossible.

Personally - you should get the other tire too! I know that is not what you want to hear!

 

[sheepfarmer]

I am thinking it will drive you nuts since your attachments will all be cattywampus. I suppose it depends on how much is a "fair amount".

 

[keithcoady]

Without going to the garage and checking it with a level and a tape measure which I can't do right now I would say it's lower on the older tire side by at least an inch.

I'll check it with the level and tape measure when I get home.

Anyone know why they would ship the tire with 28 psi when it calls for only 14 psi?

Thanks,
Keith

 

[keithcoady]

Ok, so now it looks like I'm going to have to take the plunge and purchase a second new tire/rim

The positive is I'll have 2 new tires and rims on the rear and be able to fill them without any worry and no doubt they'll last me well into my retirement.

Unfortunately, this begs another question, if the rears were worn as much as they were no doubt the front tires are wore as well. With 4 wheel drive being so dependent on the proper circumference ratio am I going to cause potential harm to my front drive-train if the front tires are worn much lower than the original circumference?

Really hoping not to have to purchase front tires as well. This second rear tire is going to be a strain on my already pinched budget.

Keith

 

[85Hokie]

Ok, so now it looks like I'm going to have to take the plunge and purchase a second new tire/rim

The positive is I'll have 2 new tires and rims on the rear and be able to fill them without any worry and no doubt they'll last me well into my retirement.

Unfortunately, this begs another question, if the rears were worn as much as they were no doubt the front tires are wore as well. With 4 wheel drive being so dependent on the proper circumference ratio am I going to cause potential harm to my front drive-train if the front tires are worn much lower than the original circumference?

Really hoping not to have to purchase front tires as well. This second rear tire is going to be a strain on my already pinched budget.

Keith

you thinking is valid! The good news is, EVEN from the factory - the ratio on the 4wd is NOT perfect, cant be. Close yes, dead money - nope.

If a tractor spends it's time in 4wd, the tire wear is proportional to the push/pull of the front and rear, so when you place new on one end, the ratio is going to change a bit, has to. HOW much it changed is hard to truly establish.

Bottom line, DONT use 4WD on hard surfaces.......if on grass/gravel/mud/snow .... use 4wd - the slippage will be fine.

At some point you will be right back in the same situation with the front, and then new tires on the front will have a different ratio to the worn rear.....

I think you are doing the best thing by having two rears the same - dont worry about the fronts, unless you are planning to be on a surface that will not allow a little give.

 

[keithcoady]

Great advice Hokie, much appreciated. Think I'm going to have to start saving for two new front tires/rims as well. Would love to have 4 new ones all around if at all possible, be better for all round traction for the winter.

Will certainly adhere to your advice about staying in 2wd while on pavement or hard surfaces in the meantime.

Once again, many thanks,

Keith

 

[2458n]

Keith my Kubota is 35 years old 3 new sets of front tires. Original on the rears. Buy some implements instead of new tires.

 

[keithcoady]

2458n, I'm going 2 fill my tires can't do that with the old ones so it's going 2 be 4 new ones prior 2 the winter.

I'll get the rear one vulcanized and sell the 4 wheels tires 4 a descent price

 

[bearbait]

Also remember if your tractor came with Firestone tires on it and say you replace them Goodyear they may say the same size on the sidewall however there may be a difference of an inch or more between the 2 brands.

 

[keithcoady]

Thanks bearbait, yes going with all Carlisle tires. Originals were Titan but Kubota is only stocking Carlisle in the sizes I need.