What PSI Are You Running On GY 614's

[KEG_75]

Hello All,

Just purchased a set of GY 614's for my Crusader 315rst. My loaded unit weights 11,500 and the 614's are overkill and costly but wanted the piece of mind of doing what I can to eliminate potential tire issues.

My question is for those of you with rigs that have a similar weight as mine (11,500) what psi are you running. I know the 614's call for 110 cold and I am aware of the inflation table. I am looking for your experiences with different psi and ride quality as well as abnormal tire wear.

Thanks for your input.

[elind]

I just pulled in from Arizona to U.P. of Michigan (2,500 miles) and kept the tire at max 80 psi with load range E 16" tires. 14,000 miles so far and no problems on Westlake tires.

[spock123]

I keep mine at the maximum pressure, it says 110lbs on the tires and that's what I run. I have heard some people run at 90lbs and I have done that but it says on my yellow sticker to run at 110lbs and that's what I run.

I had Westlake tires on my 30RL Cedar Creek, I installed the TST 507 on the tires and I never had a problem. The new Cedar Creek I have now came from the factory with the Goodyears G614.


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[ependydad]

I don't have G614 tires, but I do have tires that are an even higher load range. I run them at max PSI (125psi) with no ill effects.

[johnruff]

My tire dealer told me 80 and that is what I am running - so far no problems from Atlanta to Greenville to Myrtle Beach to Savannah. He said with this trailer, it might be bouncey if I ran 110.

[palmetto rogue]

I have 614s mounted on original wheels for my Silverback 29rk, The wheels are only rated at 3050 lbs load and are 6 inch wide. No pressure rating on wheel. After 2 sets of tire failures on ST tires in 3 years I made a compromise as they failed when I was on the road at this time and high pressure wheels were not available. According to tire and wheel mfgs assn info this is ok even though GY recommends 6 1/2 wheels. Then I used GY614 tire inflation data to inflate to E rated pressure which is 80psi. The tire side wall deflection on turning and when leveling is superior in everyway to STs at 80 psi. Also installed TPMS system and this shows pressures going to low to mid 90s when on the road. I would appreciate good constructive feedback.

[spock123]

How about letting me know how your tires are down the road. I plan to run mine like the yellow sticker says. I have heard some people say they run 90lbs in the tires. I don't know if I'm right or you are right. It says max pressure on my tires of 110lb. Whatever you are comfortable with. I have a TPMS that I trust


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[palmetto rogue]

I have been on the road for about 2000 miles. First impression after getting rid of the GY Marabombs was that the 614s rolling resistance seemed less. I checked cold pressure after a couple days and found them to be at 84 psi which is where they are now. I compared the tires visually when they were installed and these are totally different animals that the china bombs. I am really impressed so far.

[Tireman9]

With a trailer, I suggest you run the MAX pressure molded on the tire sidewall that is associated with the MAX load. This will lower the Interply Shear forces that are trying to tear the belts off the body of the tires in every turn or corner movement like this



which can lead to this



You need to also confirm with individual tire measurements that you are not loading your tires to more than 85% (75% would be better) of the MAX load in static condition.

TPMS is also excellent insurance that you would not be depending on passing motorist to flag you down if/when you develop a leak.

[spock123]

I really like the G614. I have to be honest I don't know how many miles I have on the tires but I would assume more than 5000 miles. I'm leaving on a trip to Alaska June the ninth, my next camper I hope is the Cedar Creek 36CKTS and if I can't put the Goodyears G614 on them I'll go with the Goodyears 17.5


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[palmetto rogue]

tireman I am loaded at just over 80 pct per cat scales (2500 lbs per tire). I fear wheel pressure limits thus keeping pressures at about 85 psi.

[Big Bill]

I haveg164 on cedar creek 36ckts according to tire chart i should have 80 psi ,I i adjusted 110 down to 90 3years ago ,and only lost 10 , thats pretty good

[dblr]

Replaced our Goodyears last year with the same and they recommended 90psi cold so that is what we have been running.

[Tireman9]

Originally Posted by palmetto rogue

tireman I am loaded at just over 80 pct per cat scales (2500 lbs per tire). I fear wheel pressure limits thus keeping pressures at about 85 psi.

Have you contacted wheel MFG? Is there a statement of Max load on the wheel?

80% of load is good.

[Tireman9]

Originally Posted by dblr

Replaced our Goodyears last year with the same and they recommended 90psi cold so that is what we have been running.

Not knowing your RV type (TT or MH), tire size including LR or measured tire load there is no way to know what a good recommendation for pressure would be.

A bit like saying "My RV has blue stripes on it so I inflate to 82 psi"

[palmetto rogue]

Tireman, your concerns over shear puzzle me. G614s are LT tires as are the tires on my 2500 pickup. Only difference is G rated vs E rated. The truck mfg recommends 60 front 75 rear with 80 psi max on sidewall. Why is there no concern about shear on the front tires of my truck. It seems to me the frequency of shear forces is much greater on the truck than the trailer.

[dannyabear]

According to the Goodyear site the G614 is a trailer tire not an LT tire, different animals for different jobs

[Tireman9]

Originally Posted by palmetto rogue

Tireman, your concerns over shear puzzle me. G614s are LT tires as are the tires on my 2500 pickup. Only difference is G rated vs E rated. The truck mfg recommends 60 front 75 rear with 80 psi max on sidewall. Why is there no concern about shear on the front tires of my truck. It seems to me the frequency of shear forces is much greater on the truck than the trailer.

Ya I understand your confusion
But the reality is that when computer analysis is used to look at the internal structural loading, the fact that tow vehicle tires are all operating at very low "slip angle" (difference between travel direction and angle the tires are pointed to) is significantly lower than for tires on a trailer.

The reason for this is that the center line of of tire rotation for the TV tires points to the center of the radius while the trailer tires, especially on tandem axle trailers, does not.


This translates into a higher slip angle which means higher internal structural twisting forces on the belts. The computer model suggests 24% higher on the TT tires than TV tires even if all tires were the same with identical vertical load and inflation.

TV front tires have "Ackermann" alignment designed into the suspension but TT have no allowance other than bending of tires, springs, spring mounts and bushings but the forces to bend the springs etc have to go through the belts of the tires.

This is a MAJOR reason for TT tire life to be much shorter than Motorhome or TV tire life.

Hope this helps.

[KEG_75]

Well the new G614 shoes and new rims are on the 5er. The GY614's are a lot more beefier than the Towmax 235x80x16E's i removed. The GY614 tire is approximately 20lbs heavier than the Towmax tire. If your looking for tires and or rims check out Trailer Tires and Wheels in Edon Ohio ask for Mike or Scott then did a great job and have quality products.

One item of interest to note when I called the Goodyear tech line I ask the person I was speaking to if they had many issues reported by customers regarding the GY614 the response was once in a while. When I ask the same question regarding the GY Marathons the person busted out laughing!!! Imagine that an employee laughing about one of the products their employing company manufactures. Made my mind up right there I would not be doing the GY Marathons!!

Tireman9 in regards to the interply shear and slip angle I get it and understand completely. I will start off rolling at 110 psi and evaluate the harshness of the ride and tire wear pattern and if need be make any adjustments if necessary.

Thanks to all who replied great info.

[spock123]

I really don't know what air pressure to run my G614 at. I'm just following the yellow sticker on side of trailer. It says 110lb. Just like the sticker in the door jam of the truck. There it says 60lb front 80lb rear


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