Tire/Wheel bigger tire/higher pressure?

[sjturbo]

Thanks for the responses on increased size! Now I need to know how to find out if my wheels can stand the increased pressure? Original tires were rated at 80lbs. New Carlisle's are 85lbs. Would like to go to step up to Carlisle F rated which are 95lbs. I know wheels are rated for pressure also but how can I find out what mine are rated for? Thanks!

[Bob Landry]

Keystone's primary supplier for wheels is Tredit and they have a good website. Go to it, find the photo of your wheel so you can get the part number and call them. They will happily give you information about their products.

[sjturbo]

Thanks Bob, I'm on it!

[bsmith0404]

You can also check Sendel Wheels website, they have the same wheels and have the PSI listed on the site. Additionally, the back side of the wheel typically has the max PSI rating stamped or molded into one of the spokes. One of the most common wheels used on RVs is the T03, it is rated for 100 PSI. I can't remember if you ever said what your trailer is, but now would be a good time to match the wheels with the tires as far as load rating goes, especially if you are near the max combined. RV manufacturers in general have a history of putting a light wheel on just like the tires, after awhile they can crack at the spoke. Some on this forum have already had that happen.

[dcg9381]

Ours were stamped on the inside of the wheel with max psi.

[sjturbo]

Thanks for all the feedback! I was not able to find the PSI on the wheel, however I did find that max load was 3580! I decided to go with the Carlisle 235/85/16 which is rated at 3640. So I think that gives me a bit of a buffer. As both the originals, Power King Towmax and the Carlisle are both "China Bombs", the Carlisle are load rated at 160lb higher although the size is larger also. Here's hoping I made a good choice.

[Bob Landry]

It's after the fact, but the Maxxis 10 ply tires would have been a better choice. They are made in Asia, Philippines I think, but they aren't Chinese made and have had good reviews.

[bsmith0404]

It's after the fact, but the Maxxis 10 ply tires would have been a better choice. They are made in Asia, Philippines I think, but they aren't Chinese made and have had good reviews.

Maxxis are a great tire, but they are only rated for 3420 which on the heavier trailers puts them right at or very near their max. I have 13k on the axles, depending on how much is on each axle it's very possible I could overload a tire. Add to that the tire degradation from year to year and I would definitely be overloading the Maxxis. The Carlisle tires are rated for 3640 or 3960 if you step up to the F range tire. I know a lot of people are loyal to Maxxis, but I've run Carlisles for several years and several different trailers and have never had a failure, so I wouldn't necessarily agree that the Maxxis is a better choice. If I was the OP, I would have taken a little extra time to research the wheel and see if I could have gotten the F range tire instead of the E though. Much better to gain 440 lbs per tire than 120 lbs for nearly the same price. Of course, all of this is assuming he has a heavier trailer.

[bsmith0404]

Thanks for all the feedback! I was not able to find the PSI on the wheel, however I did find that max load was 3580! I decided to go with the Carlisle 235/85/16 which is rated at 3640. So I think that gives me a bit of a buffer. As both the originals, Power King Towmax and the Carlisle are both "China Bombs", the Carlisle are load rated at 160lb higher although the size is larger also. Here's hoping I made a good choice.

3580, sounds like you have the T03 as well. If so, they are rated for 3580 lbs and 100 psi. I have them on my Alpine with the Carlisle F load range tire, but I'll be changing them out to T11BM based on advice from Sendel. They're rated for 3960 and 110 psi.

[Drew Waller]

I went to the F rated and larger diameter on my 332tS. Their on the road now. So far so good. I would have gone to the GoodYears except they were $369.00 a PC. But H rate!

[larry337]

FWIW, I have have been in contact with Sailun Tire via email. Their 235-85/16 is a 14 ply commercial all position tire rated for aprox 4000lbs at 110PSI. It is also speed rated for 75MPH. My rims are only rated for 80PSI. They informed me it is safe to run the tire at a lower psi depending on load capacity required.

Their response :

"thank you for your inquiry on the Sailun S637 tire. I have attached the S637 product sheet and a load and inflation chart for your reference. I assume you are using the 235/85R16 14 ply tire. You will see in the chart below for this size at 80 psi a single tire can carry 3,042 lbs./tire. So this should satisfy the weight requirement you indicated. I would recommend that you scale your 5th wheel trailer when fully loaded (propane tanks, water, clothes, bikes, food & supplies) just to double check the weight is still under what the tire/rim will carry."

"The tire is designed to run up to the maximum air pressure at the maximum load at the rated speed. If you have the tire inflated to 80 psi and the load is below 3000 lbs. per tire, it will not over-heat. The speed rating is “L” which is maximum of 120 km/hr. The over-heating comes from running the tire more than 120 km/hr or under-inflated for the load or a combination of the two.

You should be good to go based on the information you have provided."

The load chart he sent me is a pdf and it wont upload in my post. I'll try to find a way to do it. But basically the tire doesn't have to be run at max PSI, matter of fact it is designed to be inflated for the load required. In my case 80 PSI is more than enough and I don't have to buy new rims.

[larry337]

Here's the load chart

[bsmith0404]

This is common with tires, some companies provide the chart others don't. The links below are from Maxxis and Goodyear. Carlisle recommends max inflation recommended on the sidewall in their tires at all times.

http://www.maxxis.com/trailer/trailer-tire-loadinflation-chart
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

http://www.carlisletransportationproducts.com/about-us/faq

[CWtheMan]

Thanks for the responses on increased size! Now I need to know how to find out if my wheels can stand the increased pressure? Original tires were rated at 80lbs. New Carlisle's are 85lbs. Would like to go to step up to Carlisle F rated which are 95lbs. I know wheels are rated for pressure also but how can I find out what mine are rated for? Thanks!

Your rims are not required to be marked with a load capacity or tire inflation capacity. Some OEM providers will demand that one or the other or both be displayed on the rims they want to provide. Other vendors may not provide any capacities. The ultimate responsibility rests in the hands of the trailer manufacturer. Their requirement is to provide a tire/rim paring that is compatible with each other. The tire manufacturer provides a list of rims compatible with each tire they make.

The rim manufacturer must provide part number and serial number (if applicable) for each rim and insure each rim displays such information. Load capacity is the primary factor.

So, bottom line. When in doubt, get the numbers off the rim in question and call it’s manufacturer for load capacity Confirmation.

Rims are certified by SAE.

[dcg9381]

Thanks for the load chart.. Didn't have it, added to my library of RV Stuff.

[sjturbo]

Thanks all for the inputs! Went with a lower pressure tire so wheels not an issue. Did increase the size so that should help.