Tires 790 Tires

foggy1111 · Mar 24, 2009

When I bought my used 790 tractor in December, I did not realize that there was another larger tire size offered on these models (ignorance is bliss...right?) and from the pics I've seen the difference appears fairly significant. Well, my tractor has some pretty small R1 tires and I was about to put fluid in the rears. The size is 12.4-16 R1. I ordered some tubes for it today...to protect the rims from the fluid I am adding....and hopefully add some additional protection with punctures in the woods.

About the only advantages I see is I have a somewhat improved center of gravity, possibly a little lower ground speed with my tiller, and chains would work better on it. But I wonder how much I am giving up in the traction department?

Just curious....anybody else have this size of tire on their 790? and how do they work for you in the pulling department? (i.e. disc or plow)

Thanks in advance.

RobS · Mar 24, 2009

I have the same tires as you foggy, no complaints. They seem wider than the others, though shorter. The other big difference is the wheels. Ours are one piece and limited to two positions. The others are two piece with more adjustment options.

I haven't done a lot of ground engaging work, though I did borrow a 6 1/2 foot disc when we first got the property. It handled it surprisingly well.

foggy1111 · Mar 24, 2009

Thanks Rob. You mention the wheels having two positions.....and I have read that elsewhere. But I fail to see how these wheels could be made to go into any other position than the one they are in. I've looked at 'em every which way...and I dont think they can be inverted. (fronts? yes...did those...but not the rears).

And...good to know on the disc. Others have said all I will do is spin my wheels....but I bought a 5 1/2' KK box frame anyway....gonna load my 790 down with as much weight as I can....I figure to pull it too.

Anyway...thanks for the input. Been a long winter...and waiting to use this thing.

Mech · Mar 24, 2009

I have 11.2x24 in the rear and 7-14 in the front. I didn't know anything else was available on the 790 in R1's. I'm very happy with the traction I get with mine. I think my rear wheels have four positions.

foggy1111 · Mar 24, 2009

Evidently they did not offer those bigger tires when my tractor was built (01). My book shows either 12.4-16 or 13.6-16 for rears. I'm also not sure if they offered adjustable wheels or tires other than R1's.

Mostly curious......as these are gonna do just fine, but....Anybody know?

RobS · Mar 25, 2009

Your tractor must be about the same age as mine foggy. I recall seeing some on the lots at the time with the two piece rims as well as the one piece. Oh BTW, the two positions on ours are "as mounted" and "reversed". For reversed, you'd swap sides to keep the tread direction the same. I don't know how much offset there is, not much I think.

Mech · Mar 25, 2009

I bought mine new last year so it was the last year for the 790, now the 3005. I didn't realize they put 16" wheels on the 790.

foggy1111 · Mar 25, 2009

RobS said:
Your tractor must be about the same age as mine foggy. I recall seeing some on the lots at the time with the two piece rims as well as the one piece. Oh BTW, the two positions on ours are "as mounted" and "reversed". For reversed, you'd swap sides to keep the tread direction the same. I don't know how much offset there is, not much I think.

Yeah, I've looked at that swap.....but, I didn't think it would work out. Today I am having tubes put in my rear tires and fluid added for stability and traction...so my local co-op will need to take the tires off the tractor. I am going to see if I can swap the right for left and pick up a few inches of extra width. I'll report back my findings....but I am not too optimistic.

Rob, I am not very good at understanding ag tire sizes....so, I'm not sure, but I think our wheel/tire combo has a bit more sidewall and less wheel than the current tires offered (and a bit more width).

Also, according to my manual I am only going to add about 450 lbs of calcium chloride in both rears....but on this size tractor, every bit helps.

RobS · Mar 25, 2009

I had mine filled with Rim-Guard a couple of years ago. Weight seems about right, I think CaCl is bit more. Helped quite a bit, except on ice! Nice thing about Rim-Guard is no tubes and no rust.