All ActivityMost RecentMost LikesSolutionsRe: PSI of LT tire after upgrading from P rated tire CapriRacer wrote: JIMNLIN wrote: This information is actually uniform across all tires so we do not have our own chart. I did google it for you though and found this link: http://www.yournexttire.com/trailer-load-inflation-chart/. The chart is always a good place to start. From there you can fine tune psi that gives you the best ride....best handling and best long term tire wear for a empty truck and a fully loaded truck. CAUTION: That chart is for ST type tires - and this thread is in "Tow Vehicles"!! Geez, I didn't even look at the chart they linked to; I just assumed it was a standard chart that I was referencing earlier. They totally linked to the wrong chart!Re: Trailer Reverse Lights opnspaces wrote: I like it. I also have two LED backups that I added near the front like you did. It makes it a lot easier to back up when out in the desert at night. It also makes it a lot easier to deal with leveling blocks and stabilizer jacks as I don't need to hold a flashlight in one hand. Have you added a switch so you can turn the lights on even when not hitched up? Currently mine are only wired to the backup circuit on my Suburban. But I found that many times I need to get out and do something while leaving the lights on. The only way to achieve that now is putting on the parking brake and leaving the truck in reverse which I'm not too keen on doing. I haven't but that was on my to do list as well! It would be very handy to be able to flip a switch and have some perimeter lighting come on!Re: PSI of LT tire after upgrading from P rated tireFYI, I received the following email back from Nokian: Thank you for contacting Nokian Tyres. This information is actually uniform across all tires so we do not have our own chart. I did google it for you though and found this link: http://www.yournexttire.com/trailer-load-inflation-chart/. If your tire size does not appear on that chart you can just google "LT load and tire pressure chart" and you should be able to find it. Let us know if you have any questions.Trailer Reverse LightsMy family and I often arrive at campsite late in the day, often when it's dark, as we work a full day at work and then leave town after that. I came across a great deal on 4 27watt LED Flood lights at Princess Auto and couldn't pass them up as reverse lights for the trailer. The lights are hooked into the empty wire on the trailer coming off the reverse pin of my 7 pin trailer plug so they come on automatically with my tow vehicle's reverse lights. I installed 2 at the back of the trailer that light up behind the trailer and to the sides of the trailer and 2 at the front pointing backwards along the sides of the trailer. They are all angled down as to still allow my spotter to look at the trailer without getting blinded. This mod has made a big difference in the ease of arriving at a campsite in the dark and being able to back it in easily. The total amps the lights draw, since LED, are under the amp rating for that reverse circuit on my tow vehicle and all wiring I installed was spec'd for the length of the wire run and the amp draw of the lights over that length of wire run. Picture - for whatever reason, RV.net shows a broken image when I link the the share google photo... so here's a link instead.Re: PSI of LT tire after upgrading from P rated tire blt2ski wrote: The generic tables you have found, work for ALL brands of tires. As long as you compare size for size with in brands. That is a federal standard. No I am not surprised that a 10 ply tires, holding x lbs, assuming with in specs of a P metric, is the same max load. I personally on one of my SW 3500 years ago, found no difference in handling in an 8 vs 10 ply when both were at 60 or less lbs of psi, same loads etc. Only time the LR E came into play, was when I put 2 yds of gravel in the bed, then 80 vs 60 lbs of air did help. For most folks, getting the lowest load rating that is above what they will be at. Marty Thanks! Makes sense.Re: PSI of LT tire after upgrading from P rated tire bguy wrote: The P tires called for 35. When I switched to LT I still used 35. I actually aired up for towing but eventually concluded that the LTs did just fine and rode and wore well at 35. Thanks for this info. Based in generic load index tables, 35PSI would be fine for regular daily driving for me too. It would even be fine to support the actual weight put on the rear axle when towing my specific travel trailer. However, I would need 45PSI to obtain the max rear gross axel weight rating though if I was towing something heavier.Re: PSI of LT tire after upgrading from P rated tire StirCrazy wrote: are you using a generic table for your tire PSI/Load , do your self a favor and email the manufacture and ask for the load chart for that tire. I did this for mine, the values are close but they also can give you little tips that are specific for that tire. for mine they recommended not to run the tire under 50psi as at 45PSI they get inconsistent wear. Steve I am just using generic tables at this point. I did email Nokian a couple of days ago but haven't heard anything back yet. Hopefully I will and this will provide some extra information.Re: PSI of LT tire after upgrading from P rated tire Grit dog wrote: cj_rezz wrote: rhagfo wrote: agwill wrote: Take a chill pill way too much worrying inflate to rated tire pressure listed on sidewall of tire. This advice is extremely incorrect in the OP case! The OP has the correct inflation for his tires figured out. fully loaded 35 front 45 rear. I would run 35 rear empty. Would you run 35 in the rear when not towing just for the comfort or more due to likely more even tread wear across the width of the tire? If it's just for ride comfort, the ride is not bad at all with 45 in the front and rear but definitely don't want to cause any uneven wear with too much tire pressure. It’s sort of a balance between pressure, tire vs rim width and tire construction. Some combos cause the tire to balloon a bit more than others. Others are happy tuning higher than needed pressure without affecting treadwear. Generally if rim width is well matched to tire width less potential for ballooning or the opposite with too wide of rims. Interesting. Thanks for that insight.Re: PSI of LT tire after upgrading from P rated tire Lwiddis wrote: Why not follow the manufacturer’s specifications? Unfortunately, unlike other tire manufacturers, Nokian doesn't seem to publicly post load index tables for their tires. I did email them so we'll see if they can provide any information but no reply in the last couple of days unfortunately.Re: PSI of LT tire after upgrading from P rated tire jerem0621 wrote: Just want to quickly say that my P tires on the Tahoe were rated to nearly 10,000 lbs of capacity at max PSI. REGARDLESS of that. It was a squishy ride with my TT... and now that I have them on the Tahoe I realize just how squishy the empty ride was, because even at 41 PSI the ride is much more sure footed. As to how am I going to air up my tires. I’m going to test on it and see which psi works for me while empty and which works for my load while towing. I just changed to LT’s and I am well pleased. Relax a bit and stop getting lost in the charts and just test on it. It’s really not that complex. Thanks, and JMHO Jeremiah I struggled with the decision to upgrade to an LT tire as the P rated tire was technically rated well enough to pull as big of trailer as the truck can technically handle. However, standing on the bumper with the trailer hooked up and doing even the slightest bounce and seeing those P rated tires flex the way they did nudged me towards the LT tire. Now after having them installed for a few days I'm happy with the decision. The ride comfort is still good but I"ll be curious to see what impact there is on fuel economy. This Nokian 10 ply tire weighs the same as the P rated tire I had on before so hopefully not too much impact. I want to get the tire pressure as spot on initially as possible. By the time I will notice uneven wear, the tire will already be unevenly worn.
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RV Newbies We all start out new. Share lessons learned or first-time questions!Jun 15, 20174,026 Posts