G Rated Tires / Not Max Pressure

[lawnspecialties]

In another thread, we're discussing if the dealer gave me the proper valve stems for my G614s. They're certainly not the typical metal stems. The dealer is 260 miles away. So I'm fixing this thing here. I will be discussing this with them tomorrow for sure.

But if these are 100 psi rated stems, how much of an issue is it to just keep them and run 100 psi? I know I don't need the full 3750 lb. rated capacity at 110 psi. The camper originally came with E rated tires. I just wanted the G614s because the speed rating was 75 mph and I experienced a TowMax failure one trip and never want to go through that frustration again if possible.

What's the drawbacks of running these at 100 psi?

[lawnspecialties]

I've already decided to swap them out. I could possibly live with 100 psi but wasn't even thinking about the increase in pressure from heat. My guess is I'd need to never exceed 90 psi cold to make sure I stayed under 100 psi.

That isn't going to work. I'll be in contact with my dealer today to find out how he'd like to pay for it.

[Lantley]

smkettner wrote:

lawnspecialties wrote:
What's the drawbacks of running these at 100 psi?

100 psi gives you 3550 rating.

http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

Good Info smkettner.
My thought is why not get the full ability of the tire. I would not let the tire rating be determined by the valve stem.
If the tire can handle it but the valve stem can't get new stems.
For me the whole point of getting a better tire is to get increase margin.
If your towing a heavy trailer you want all the margin available.
If you have a 3750# rated tire but only need 3200# you have a 550# cushion. That cushion is what helps absorb the impact when you hit a large pot hole traveling down the road. That cushion is what gives you a safety factor on a super hot day as tires heat up.
The problem with ST tires is they have no additional margin or cushion built in. A passenger rated tires has 20% cushion built into the ratings. However a ST tire is not rated to carry passengers and does not have the cushion factor (safety margin) built into the ratings.
I want all the cushion/safety margin I can get. I don't want that cushion/safety/load rating to be compromised by something as trivial as a valve stem. I also don't want my tires to be limited by the valve stem.
TPMS is another reason to have metal stems.
In the end much in the same way a tire should at least match the axle capacity. The stems should also match the tire capacity.

[fj12ryder]

FWIW I run my Sailun's at 100 psi, and they usually will be up to 107-110 psi after some sustained highway speeds. If it were me I'd bite the bullet and get the metal valve stems.

[time2roll]

lawnspecialties wrote:
What's the drawbacks of running these at 100 psi?

100 psi gives you 3550 rating.

http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

[Bill___Kate]

TucsonJim wrote:

As a caveat, if you ever install metal valve extenders or an external TPMS system in the future, do not use rubber stems. Centrifical force can cause break or crack the stem and cause it to leak or unseat.

I agree because I found out the hard way .......

[TucsonJim]

TR600HR and TR801HP (rubber high pressure valve stems) are rated for a maximum pressure of 100psi, or 6.9 bars. A TR416 or TR416S metal valve stem can handle up to 200psi, 13.8 bars.

You may be okay with a 100psi rated valve stem since you won't be running max pressure in those tires. But why take a chance. Go with the Metal clamp in
TR416 version torqued to 24-45 inch pounds.

As a caveat, if you ever install metal valve extenders or an external TPMS system in the future, do not use rubber stems. Centrifical force can cause break or crack the stem and cause it to leak or unseat.

[larry_barnhart]

Probably nothing will happen for the tires but they will have more air pressure as you tow. I did not know the stems had a pressure rating.

chevman