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Old 07-03-2014, 05:13 PM   #29
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I agree with what you are doing. Paying close attention to tires in my opinion goes a long way toward safety.


Joe 1998 Itasca Sunflyer Ford 460
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Old 07-15-2014, 02:01 PM   #30
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Tomorrow is the day. A full set of Samson tires will be installed, and beads for balancing.

Fingers crossed for a nice, smooth, ride.
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Old 08-16-2014, 12:39 AM   #31
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samsons

I'm looking at them also and I have been doing a lot of reading on the china tires. I went to several tire dealers in the past few weeks and have heard all the sales pitches. I have been putting off this purchase way to long I have to get 6 new tires. I have two tires that are 6 years old and 4 that are 8 years old all are f load rated. The samsons are g rated my coach is light 11700 base wt and gross is 15000. those of you who actually have samsons on your rv's how are the handling and what are the speed ratings. I can get 6 on my rv for about $1400. Thanks and keep the shining
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Old 10-16-2014, 12:50 PM   #32
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The used RV we recently purchased had Samson 275/70R-22.5 tires on the front, and old Yokohamas on the rear. The front tires are very smooth riding and seem to me to be a good tire. So I bought new Samsons for the rear. The only problem is no tire inflation chart. At 120psi single load is 6175 per tire, and dual is 5675 per tire. GVWR is 27,410. Have not weighed yet, but based on GVWR the tire exceeds that by quite a bit. Is there a tire inflation formula somewhere? Also, the fellow who sold them to me told me to keep them inflated at 100psi or higher.
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Old 10-16-2014, 08:28 PM   #33
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FYI Truck tire inflation charts are set by the tire and rim association. I posted a link on an earlier Samson discussion thread. Just search for the earlier post for the link. If I could remember the link, I'd re post!

Have had Samsons' on for over 10,000 miles with no issues. They ride and track fine. I'm near the bottom of the inflation table at my weights and they run cooler than the towed tires.
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Old 10-16-2014, 10:58 PM   #34
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I must be missing something here. Went to every inflation chart I could find, and none matched the 120psi of the Samsons. Please enlighten me.
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Old 10-17-2014, 07:40 AM   #35
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Here's a tire inflation link:

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


I just had 6 Samsons installed. One steer tire was a bit out of round, so it got switched with a rear tire. Two trips planned in the next two months, so I'll know more when we get back. At 1/2 to 1/3 the cost of GY670s, I'll take my chances; but wear is the least of my concerns.
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Old 10-17-2014, 08:17 AM   #36
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Since Samsons are truck tires, you'll need to use the load and inflation chart published by the Tire and Rim association. They charge for the table, but if you go to http://www.forconstructionpros.com/d...ressure-tables you'll find a copy published by Goodyear. When looking up your tire, be sure you have the right tire by checking the load rating next to the max pressure. Just tried the link and it will only get to the web site. If you type in the rest of the address you can get to the chart or do a search for truck tire load and inflation charts.

2-lane, if you were checking for 245/70r19.5 tires, there are 2 listings. The second is for h rated and matches the 120 max pressure.
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Old 10-17-2014, 11:40 AM   #37
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bamaboy473... I also have a 37 foot dp. What pressures are you running? To add to the confusion, I stopped by the tire store where purchased. The fellow told me not to run less than 100psi in that the sidewall flex if run lower is too much and run might too hot. Also the tires are rated as a H, 16 ply, but use 144/141 load index which is for a G, 14 ply. All the tire inflation charts I've looked at for tires in this size have a load index of 146/144. Yes they can be aired up on the high side, but I want exact numbers. I sent an email to Guizhou Tyre co. Keep you posted if they return email.
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Old 10-17-2014, 01:16 PM   #38
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Thanks 56safari. I downloaded that chart. I think the problem is that the 275/70R-22.5 Samson is an H rated tire. So that would mean the load index should be 146/144, or 6610/6175 @ 120psi. But marked on the tire is a load index of 144/141, or 6175/5675 @ 120psi, the same as a G rated tire. It seems no one makes a G rated tire in this size. It doesn't seem right to compare to a 19.5 inch rim tire rated 144/141 because the smaller tire has less volume of air. I'm happy with the tires, just don't like guessing what the pressure should be.
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Old 10-17-2014, 08:13 PM   #39
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2-Lane, You're absolutely right. Didn't mean to imply you could use the 19.5 inch table for 22.5 tires. The air volumes are significantly different. I haven't seen a g rated tire with a 120 max pressure, but the volume of a 255/80r22.5 is only 0.3% less than the 275/75r22.5. MIchelin has an rv tire that size, but the max pressure is 110, not 120. Perhaps adding 10 PSI to the table for the 255/80r22.5 would get you close to the optimum pressure for your weights.

I'll bet there is a tire and rim association pressure and load calculator for your tire, you just need to find a tire dealer that will give it to you!
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Old 10-17-2014, 08:33 PM   #40
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Thanks for the input 56safari. I have spent hours looking at charts and have come up empty. They might be out there, but I can't find em. I may take your advice on the 255, or try a different thread. Thanks!
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Old 10-18-2014, 06:27 AM   #41
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Quote:
Originally Posted by 2-lane View Post
bamaboy473... I also have a 37 foot dp. What pressures are you running?

Let me first say that I experiment using SWAG theory when it comes to things like air pressure in tires. We all know that there can be a lot of variation and still drive the same (think of the last time you had a nail in your tire and didn't notice it until it was flat in the driveway).

That said, my steer tires got deflated to 95psi and the rears to 100. According to the weigh scales at the county dump, my coach only weighs 24000 pounds and the GVW is 28000, so we're on the light side by quite a bit.

Secondly, our first trip with these tires is coming up next week. I'll use the TPMS to see whether I'm getting increased temperatures or side-sway. Does anybody else use those lower pressures on coaches weighing about 12-14 tons?
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Old 10-18-2014, 11:46 AM   #42
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bamaboy473...Don't know what SWAG means, but very much interested to hear about your trip and what you learn about tire pressure. I will be traveling about 350 miles next week for a short trip. Thinking about the same as you on pressures, 100 front 105 rear.
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