One more time: Tire pressure May 26, 2020, 09:56:49 am I probably leaving my house for good today (latest tomorrow) and would like to ask one more time about tire pressure.Clear is: Only now it makes sense to weigh the rig and take the weight into consideration, and that weighing will not happen within the next weeks. I will do it on the road as soon as possible.When I bought the Lazy Daze from Laurie, who had it for 12 years and took excellently care of it, she told me that she always had the tire pressure on 75 PSI. That's also what I did in the last two years. When I now got new (Toro) tires I told the shop to put 75 PSI into the tires - and got the rig back with 68 PSI in the tires. Apparently they thought that is the "normal" pressure for the tires.Now I'm putting for the last time in the cool morning air into the tires. It's hot in Arizona, it will be hot on the way to Zion National Park and while being there, it will be not as hot in Bryce Canyon National Park.Is it OK to have the tire pressure for the time being at 75 PSI - in the cool morning! - or should I be a little lower? It would be great if I could get some tips here.Thanks,Klaus
Re: One more time: Tire pressure Reply #1 – May 26, 2020, 10:22:52 am You're thinking about this too much. I put 65 in my front and 70 in the duallys. Make sure you remember to pump up each of the 4 tires in the rear. 1 Likes
Re: One more time: Tire pressure Reply #2 – May 26, 2020, 10:34:53 am Based on the loaded weight of our 27MB and the tire manufacturer's recommendations, I put 65psi in the fronts and 75psi in the rears.When I bought the coach it had 75psi in the fronts and tended to wander on the road. With 65psi, the road manners are better.Harold 1 Likes
Re: One more time: Tire pressure Reply #3 – May 26, 2020, 10:43:35 am "I told the shop to put 75 PSI into the tires - and got the rig back with 68 PSI..."It would seem that your shop's pressure gauge and your gauge are not calibrated to the same standard! When I want my service facility to check the tire pressure I always insist that they use my gauge and not theirs.I typically run 65 front and 75 rear but I've got a 30' which weighs a bit more than your 26.5'. That pressure should carry the weight and still not be too harsh a ride.So you take your nice 'cool' tires out on a hot highway and, yes, the pressure will build as the day goes on. However, even so, it's unlikely to be over the mfg limit for that tire. You may want to think about using an infrared hand held thermometer to periodically check the pressure/temperature at intervals down the road. ;) Amazon.com: ennoLogic Temperature Gun (NOT for Body Temperature) - Dual... 2 Likes As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: One more time: Tire pressure Reply #4 – May 26, 2020, 11:06:36 am What temp = what pressure?Until you get a feel for what's what you can build a chart, utilizing the pressure gauge and the thermometer together to determine what temperature corresponds to what pressure. It ain't rocket science! But your concern would be for the high end, higher temp = higher pressure. A quick reading on each tire should tell you what you need to know.My Dad used to use a miniature baseball bat when he was driving truck, listening for the sound it made. Don't know how he knew but he did it for years.
Re: One more time: Tire pressure Reply #5 – May 26, 2020, 11:25:29 am I never trust a service shop with my tire pressures and always verify the pressure myself after leaving the shop. As far as starting pressure, just roll with what the tire manufacturer suggests based on your loaded weight. Pressures will fluctuate during your travels based on the ambient temperatures and driving conditions. Check your tiress each morning (when cool) before traveling.Have fun on your trip!
Re: One more time: Tire pressure Reply #6 – May 26, 2020, 11:26:24 am Quote from: HiLola - May 26, 2020, 11:25:29 amI never trust a service shop with my tire pressures and always verify the pressure myself after leaving the shop. As far as starting pressure, just roll with what the tire manufacturer suggests based on your loaded weight. Pressures will fluctuate during your travels based on the ambient temperatures and driving conditions. Check your tires each morning (when cool) before traveling.Have fun on your trip!
Re: One more time: Tire pressure Reply #7 – May 26, 2020, 11:30:46 am "My Dad used to use a miniature baseball bat when he was driving truck, listening for the sound it made. Don't know how he knew but he did it for years."---A "tire bat"; mine is basically a large dowel with a metal band around one end. Whumping each tire (whack the tread) with the bat obviously doesn't reveal the pressures, but any sound differentiation among the tires indicates a problem.BTW, just a reminder: Tire pressures (correct front and rear pressures are established using the figures from a four-corner weighing) should be checked in the morning when the tires are "cold" and before moving the rig. Checking the pressure of a warm/hot tire, even after running a couple of blocks, will give a false reading. Also, never bleed air from a hot tire thinking that it it overpressurized; it is (obviously) normal for tire pressures to rise when the tire is hot. If the tire pressures are set correctly when the tires are cold, one should have no issues with the tires running too hot. This assumes, of course, that in addition to the pressures being set accurately, that the tires, particularly the sidewalls, are in good condition, that the rig is not overweight, that the inside dual is protected, at least somewhat, by heat shields, and that one doesn't run over some "road hazard". If the above conditions don't apply, tire problems should be expected.YMMV, as always. 1 Likes
Re: One more time: Tire pressure Reply #8 – May 26, 2020, 11:37:18 am The 'correct' answer is that you need to weigh each axle on your rig and adjust the cold tire pressure according to a chart provided by the manufacturer for the actual weight you are carrying. Some reading on this board will reveal that most MB owners end up with around 60-65psi in the front tires and 70-75psi in the rears. These are cold pressures. It is important to be in the right ballpark, as too much or too little pressure can result in a harsh ride, uneven tire wear, or a diminished contact patch between your tire and the road. Unless you're loading you rig with tons of bricks, the above recommendations will probably serve you well enough until you can get accurate weight measurements. Even then, it will all change (slightly) once you fill or empty the water tank. Rich'03 MB in NC 1 Likes
Re: One more time: Tire pressure Reply #9 – May 26, 2020, 12:39:38 pm E450 LDs have a similar amount of weight on the front axle, it's the rear axle that varies a lot depending on floorplan and loading. 65-psi for the front tires is a common setting. The rear tires can be from 65-80-psi.As mentioned, weighting the rig and setting the tire presssure using the manufacturer's tire pressure chart or the chart in the LD Owner's Manual.Whatever pressure you use, do not drop the air pressure on hot days when you suspect the tire pressussure will climb too high, the tires are designed to handle the extra heat and pressure stress encountered in the summer.Larry 1 Likes
Re: One more time: Tire pressure Reply #10 – May 26, 2020, 08:53:21 pm We had our 31’ weighed at each corner. The tire charts recommended 65 psi for the front and 75 psi for the rear tires. I use tpm to monitor temp and pressure while driving. Randy 1 Likes
Re: One more time: Tire pressure Reply #11 – May 27, 2020, 12:12:50 am I had a four wheel alignment on our LDS., that included a coach weigh. I’ve attached a copy of the report with the recommended tire pressure.Macmarty2005 26.5 MB 1 Likes
Re: One more time: Tire pressure Reply #12 – May 27, 2020, 01:03:46 am Quote from: Macmarty - May 27, 2020, 12:12:50 amI had a four wheel alignment on our LDS., that included a coach weigh. I’ve attached a copy of the report with the recommended tire pressure.Take a look at Toyo and Michelin's RV tire pressure charts. https://www.toyotires.com/media/2125/application_of_load_inflation_tables_20170203.pdfhttp://www.rvtirepressure.com/assets/images/extrapages/Michelin_Rv_Load_Inflation.pdfUsing the weights provided by the alignment shop, each tire is carrying about 2100-lbs. Both charts show the same, the front tires need 60-psi and the rears 65-psi. It looks like they added an extra 10-psi to both manufacturer's recommendations.Larry 1 Likes
Re: One more time: Tire pressure Reply #13 – May 27, 2020, 09:39:30 pm I lowered the pressure to 67 PSI in the front and 72 PSI in the rear tires and had already on the short ride from Sedona to Cottonwood the impression that the ride was - compared to having 75 PSI on all 6 tires - easier. The rig seems to be more willing to drive just straight ahead. Whether I will say the same after driving a couple of hundred miles I will see.After reading all the comments herel I will tomorrow morning lower the pressure in the front a little more to 65 PSI. That is the best guessing I can do for my rig for now. And then I will, of course, have the rig weight as soon as possible.Thanks for all the information and tips. This forum is a reason to have a Lazy Daze. I’m sure there are other great forums, but the fact that Lazy Daze is building basically only three different models - and in many regards not very different now than 20 years ago -, and the willingness of so many Lazy Daze owners to share their knowledge here is really great. I met some of you already in Quartzsite last year and this year, and I hope to meet more of you down the road.Klaus 5 Likes
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