TIRES

[maddog2020]

I have a 2009 JD 4720. The rear tires are shot. They are R4 s. I replaced the front tires last year wit factory size 10x16.5. The rears are 17.5x24. I would like to replace them with 19.5x24s. I know they will fit they are only about 3 inches taller. My question is will this be a problem when tractor is in 4wd. I noticed same size tires tire vary a couple inches any from manufacture to manufacture

 

[dodge man]

I’d say three inches taller is to much.

 

[RayIN]

That larger rear diameter will ruin the front diff. if the fronts are the OEM size. The front tires will always be pushed when in 4WD

 

[maddog2020]

So id i decided to go with the larger rear dire what size would i need to put on front. Is there a chart a formula to figure that out?

 

[dieselscout80]

You want the fronts to turn slightly faster than the rear tires (called lead IIRC) and going larger on the rear will reverse that and not work.

That said look at the correct front to match the 19.5 tires. On the NH TC series the ones with 19.5 rear use a lager 12.5x16.5 front tire.

Maybe JD has an another tractor with them.

 

[scootr]

Curious why you want to change the tire size ...