4020 tire size

WyattO · Nov 29, 2022

I have a John Deere 4020 and have seen a lot of different opinions about them, but how big of tires is too big? I need a new set and would like to run wide tires but is 20.8-38 as big as I should go to still get the tractor to hook or could I go bigger and run something like a 710/70r38? Just curious any opinions on this would be appreciated!

fdt860 · Nov 29, 2022

(quoted from post at 20:33:40 11/29/22) I have a John Deere 4020 and have seen a lot of different opinions about them, but how big of tires is too big? I need a new set and would like to run wide tires but is 20.8-38 as big as I should go to still get the tractor to hook or could I go bigger and run something like a 710/70r38? Just curious any opinions on this would be appreciated!

You cannot go any higher than 18.4 38. Even then you need to raise the fenders 2 inches to have the tractor looks nice. All tjose tires are close to same height than 18.4 38.

18.4 is 480 mm wide and same 480/85r38

20.8-34
520/70R38
600/65R38 (I had that on mine)
650/60R38
710/55R34
24.5R32 or 680/75R32
Some 30.5LR32 are very close to same height also
67-44-32 will be slightly shorter but still look very big (1100 mm wide)

WyattO · Nov 30, 2022

With the 600/65r38 did the tractor still have good power?

WyattO · Nov 30, 2022

Also would the 4020 be able to handle a 30.5-32 size tire
would it work or just be a show piece?

Scott 730 · Nov 30, 2022

What will this tractor be doing that it needs huge tires???

WyattO · Nov 30, 2022

In all honesty nothing. I got the tractor for next to nothing
and it needs tires I would like to go pulling a little but
nothing crazy. Hell I may just drive it in circles i I feel the
need. I just have seen a handful that have those massive
tires and I really like how they look.

Scott 730 · Nov 30, 2022

Well you need to decide what you want to do with the tractor. Huge tires that look cool aren't gonna win any pulls on a stock tractor.

Tx Jim · Nov 30, 2022

Larger diameter rear tires than factory specifications are going to severely affect the 404 cubic engines ability to pull a heavy load.

fdt860 · Dec 1, 2022

(quoted from post at 23:02:21 11/29/22) With the 600/65r38 did the trkactor still have good power?

Yes, very good power, and traction.was not an issue. No more slippage while chisel plowing with it. Particularly advantageous in soft ground.
30.5 32 tires will also pull well,but not as good if you use combine tires: they have very rigid sidewalls to handle the combine weight and will not flex as good as 600/65R38.

In very wet soils, the 800-32 will not cleanup as good as 600mm wide tires.

DR. EVIL · Dec 3, 2022

WYATT - THE two young neighbor's farmed with a pair of 4020's with MONSTER turbos off some huge Cummins or CAT engine sticking out a huge hole cut in the hood, and a big dry-type air cleaner bolted onto the frame. They told my cousin they farmed at around 400-450 hp and pulled the local county fair pulls between 500 to 600 hp, the farmed 320 acres across from our farm with 23.1x30 or maybe 34 rear tires, can't remember which, and pulled a new deere 6-16 semi-mounted on-land hitch plow about 2-3 inches deep in 4th or 5th gear, I guess something in the transmission or rearend didn't like working any harder than that. And NO weights anywhere near the rear of the tractor.
The prior renter didn't have any problems pulling 7-14's behind his stock 1206.
Anyhow, with the price of new tractor rear tires, run what you can afford.

4020 tire size

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