View Full Version : G614 Repacements

01-21-2015, 03:59 AM
What brand of tires are recommended to replace 614s.The second set just as the first is wearing the shoulders off both on the inside and outside. I have IS suspension and the alignment has been checked, have TPMS and always run at 110 psi. Have 18,000 miles on this set and getting close to replacement.
Thanks Ken

01-21-2015, 04:36 AM
Just a comment. I bought my 2011 Big Sky 3580RL brand new. It has the G614 tires on it. The inside and outside edge of all four tires for about 1 1/4 inch is perfectly smooth, not a grove, line or mark of any kind. The tires come that way brand new. I am not saying your tires are not wearing on the inner and outer sides, but mine have looked that way from day one.

01-21-2015, 04:43 AM
so are mine and i just got them this past weekend.

01-21-2015, 07:08 AM
Yep, at first glance of any new G614 tire it looks worn on the outside edges already. At 18000 miles they shouldn't have to be replaced.

Tom S.
01-21-2015, 07:11 AM
Can I have your old set??? :D :D :D

01-21-2015, 11:39 AM
The 1st set was replaced when the cords started showing on one of the shoulders

01-21-2015, 04:15 PM
If its really wearing, somethings not right. We have IS and more miles than that on them and they still look like new.

01-21-2015, 11:45 PM
Something is definitely wrong here. The brand of tire will not dictate where the wear occurs.

01-22-2015, 12:57 AM
The G614 requires a minimum rim width of six and a half inches. Other manufacturers of tires the same size as the G614 say their tires are good to go on 6Ē wide rims. So, if on 6Ē wide rims, the G614 is being pinched. Is it enough to effect the outer tread area? I donít know, but itís a good question for a Goodyear tire expert.


Tom S.
01-22-2015, 03:40 AM
quote:Originally posted by kenandjudy

The 1st set was replaced when the cords started showing on one of the shoulders

That is an indication of an alignment issue or possibly a bent axle (I have first hand experience with the bent axle).

01-22-2015, 03:59 AM
quote:Originally posted by CalandLinda

The G614 requires a minimum rim width of six and a half inches. Other manufacturers of tires the same size as the G614 say their tires are good to go on 6Ē wide rims. So, if on 6Ē wide rims, the G614 is being pinched. Is it enough to effect the outer tread area? I donít know, but itís a good question for a Goodyear tire expert.

My G614's are mounted on the original rims provided by Keystone, which are 6" IIRC. The dealer said that is fine and I believe others on this site are also using the same rims. If rim width is the problem, someone would have run into this by now, I would think. Besides, wouldn't a narrower rim tend to cup the tire up and off the pavement, as opposed to applying more pressure? Seems as though the middle of the tire would be doing most of the work. Just asking.

01-22-2015, 04:12 AM
Have to agree with others here, there must be something out of alignment. The G614 has a significant amount of rubber on the tread, to have one wear down to the cords certainly indicates something other than the tire is at fault.
My daughter has a 3 horse, living quarters trailer, it has IS suspension and the tires are approaching 5 years and 30 to 40 thousand miles, yes they show tread wear but no more than would be expected with that amount of miles. The trailer has a GVWR of 16,000 lbs so when she is loaded she is carrying more than most 5ers.

My opinion is perhaps a bent spindle or other alignment issue, not the tires.

01-22-2015, 09:47 AM
These pictures are after about 700 miles, I had Goodyear replace all of them 100% covered. Lonnie drove up to Tucumcari to look at them, he agreed all was right with the Montana and tire pressures.
I think they use soft rubber that scuffs off when turning sharply, like in a parking lot.
Not very happy with that, BUT, the ones they put on have about 1400 miles on them and look fairly good.


01-22-2015, 01:42 PM
We have OEM axles and springs on the Montana that I check regularly for u-bolt torque and appear to be properly aligned with an estimated 20K on these G614s, and they look good. We keep tires inflated to 110 and try not to turn sharply. However, we can feel just a slight cup of extra wear on the edges on both inside and outside of front two tires.

01-23-2015, 06:31 AM
You definitely must be running at least 100 psi in the tires, otherwise, the shoulders on these or any tire will wear prematurely. I run 110 psi, and other than the typical slight wear in the shoulder areas, they are wearing well. The G614's, even when supplied from the factory, come on the 6 inch rims, so that shouldn't be an issue either.

01-30-2015, 04:07 AM
Ken has an interesting issue that really causes one to say how is this possible. The only thing I can say is that I have seen many tire gauges that over read actual pressures and maybe this is the issue. I also know that goodyear's website says the G614 needs 6.5 inch wide wheels and thatis one of a few reasons why I went to 17.5 inch wheels and tires. And yes, they are the same diameter as the old chinese proverb tires. John

Phil P
01-31-2015, 12:41 AM

The early G-614 did have an outer edge wear problem that Goodyear addressed by replacing them for you. The later ones donít have this problem.

I run 110Psi in ours and now have about 30,000 on them and they look good except for the one damaged when the spring on the rear axle broke in Missouri.

Phil P

02-18-2015, 02:49 AM
Checked with my tire guy yesterday asked his opinion on g614s on 16 inch rim his response was sure you can but your will pooch out the edges and cause the edges to were earlier than the rest of the tire, don't want that problem change the rims now this is a real tire store they r/r balanced 6 tires on my dully in 20 min

02-19-2015, 03:11 PM
Was happy I got two seasons out of my marathons with no problems, looked at them today and was checking lug nuts when I observed a bubble on the side of the right front tire. Called Goodyear and they allowed me $60.00 dollar trade towards G614', still very expensive but this should take care of the concern and worry.

Believe it or not the guy at the tire store was not sure what G614's were, he had never heard of them. But then he stated that he has not had any bad experiences with Marathons either.

This will slow down the purchase of Trojan T145 batteries, but next year!!

03-04-2015, 08:50 AM
One of my Marathons blew yesterday. Good thing I wasn't on the highway I was on a local road so there was no damage to the rig. A guy pulled up a long side of me at the light and told me one of my tires just blew. Knowing the problem with the Marathons I always checked tire pressures before leaving home and the camp site so I know it wasn't low pressure. The tires weren't worn. They were only 2 years old with low miles. Looking at the tire it looked like tread separation. There was no tread left on the tire with steel belts sticking out.
I have a 2012 3750FL I want to replace all 5 with g614's. I have a question. My original tires are 235 80R 16's. I went to Goodyear. The guy behind the counter didn't seem very knowledgeable. He told me that the g614 only come in 235 85R 16's. It this what you guys have been using? The only difference being the sidewall height. Just what I need another inch added to my trailer height [:0]

03-04-2015, 09:46 AM
he's correct as far as I can see

03-04-2015, 10:04 AM
So there should be no issue going from an 80 to 85 correct?

03-04-2015, 10:19 AM
quote:Originally posted by DmaxDually

So there should be no issue going from an 80 to 85 correct?

from my understanding from my tire shop 16 inch rim will work fine the only thing it will do is cause the side walls to puff out a little more

03-04-2015, 01:48 PM
If you actually check, I think the 614s are a fraction less than the Marathons. I know going to 17.5 GY114s are just a fraction less than the 614s, but so close you'll never notice.

03-04-2015, 02:12 PM
quote:Originally posted by DmaxDually

So there should be no issue going from an 80 to 85 correct?

I had 614's put on our 3750FL on the stock rims and never had a problem or hiccup from the tires. I think you will be fine and I can almost assure you that you will not regret the decision. By the way, if the tires are an inch bigger in diameter, they will only raise the rig half of that or a half inch. On another note, I am having a hard time rationalizing how a 1/4" difference on each side of the rim would cause any noticeable bulge to the sidewall and result in wear to the outside of the tire?

03-04-2015, 02:36 PM
OK here's the scoop directly from the Goodyear site:
Marathons - ST235/80R16E - 30.7" D
G614 RST - LT235/85R16G - 30.7" D
G114 LTH - 215/75R17.5H - 30.5" D

03-04-2015, 03:13 PM
If the tire diameter is only one inch larger, that will only add 1/2 inch to your height. The G614's have been an option, so these work quite well, and you will not notice any real difference, except for a better, more stable ride. When you are up there around 13 feet and maybe over to the top of a front A/C, that 1/2 inch won't matter.

03-04-2015, 05:23 PM
OK thanks.I will be purchasing 5 G614's asap. Also installing metal valve stems and TST 507 flow thru tpms sensors.I already have the 507 system in my TV so I will just add 5 more sensors to the rig.

03-05-2015, 12:00 PM
Just ordered 5ea G614's. This may sound like a stupid question but I didn't notice any balance weights on my rim. I'm definitely having them balanced. Aren't the original wheels balanced at the factory?

03-05-2015, 06:16 PM

03-06-2015, 02:22 AM
quote:Originally posted by rohrmann


Really..they don't balance the tires at the factory, any reason why? Shouldn't all tires that travel at highway speeds be balanced? I'm not tire expert but maybe that is a contributing factor to the Marathon tire failures. I guessing that everyone who had there tires replaced with the G614's had them balanced right?

03-06-2015, 06:23 AM
And they should torque the ubolts on the springs per spec, but that didn't happen to a lot of us. John

03-06-2015, 06:51 AM
As far as balancing, I guess if no one is riding in the rig, they save money because they figure on one will notice. The lack of balancing sure played havoc with our original Marathons, caused all kinds of weird wear. When we replaced them with the G614's, yes, they were balanced.

The discussions about the u-bolt torque came down to the fact that the spring packs were installed on the axles by Dexter and sent to the Montana factory as assemblies. the only problem with this, is until the whole package is assembled and the springs are loaded, the torque is just fine. Once loaded, then the springs are flatter, and the nuts on the u-bolts should be re-torqued, but that isn't being done, by the factory or the dealer prior to delivery. So, along with the other normal owner safety checks and maintenance, add the u-bolt torque check.