mguay Posted October 10, 2017 Report Share Posted October 10, 2017 When I bought the truck it had a bunch of mismatched rear tires on the tandems. It did have 2 close to new Aeolus HN 308’s so once I singled it I bought another pair so I would have all matching drives. I put the new ones on the outside. The new set is wearing a bit funny after about 4000 miles of bobtailing with the Smart on. The outer ribs are great. It’s the inner blocks that are wearing funny. The leading edge is higher than the tailing edge. Yes it has had an alignment since singling. No this is not a debate about my Chinese drives. We have been using them on all of our FL 70’s at work for years. Unfortunately I haven’t weighed it with the 5er yet. I have weighed it with the smart and full of fuel. 21800# The sidewall states 110psi and that is what I have them at. It rides fine. Is anyone running lower than sidewall pressure? Thanks for the help Link to comment Share on other sites More sharing options...
noteven Posted October 10, 2017 Report Share Posted October 10, 2017 What load in pounds at 110psi does the sidewall say? "Are we there yet?" asked no motorcycle rider, ever. Link to comment Share on other sites More sharing options...
Shallow Draft Posted October 11, 2017 Report Share Posted October 11, 2017 110 steers and 95 drives 2004 Volvo 630, Freedomline, Rear view camera, Max Brake, Jackalopee, 38 ft 4 horse LQ Platinum, 40ft Jayco Talon toy hauler Http:/www.flickr.com/photos/shallow_draft/ Https://flic.kr/p/fqhyAN You are not lost if you don't care where you are!! Link to comment Share on other sites More sharing options...
mguay Posted October 11, 2017 Author Report Share Posted October 11, 2017 42 minutes ago, noteven said: What load in pounds at 110psi does the sidewall say? 5675 @110psi dual Link to comment Share on other sites More sharing options...
beyerjf Posted October 11, 2017 Report Share Posted October 11, 2017 The ideal scenario would be to put the 2 new tires next to each other, the other tires in the remaining location. Putting a new tire next to even one that has some wear on it will cause the older tire to "skid" along since the 2 tires have 2 different circumferences. The result will be an unusual wear pattern like you describe. Now that it is done there isn't much you can do about it. There is nothing unsafe going on. You will probably age out the tires before wearing them out. You can run less than maximum pressure on a tire is it is carrying less than maximum load. There are tire manufacturers that publish charts, size tire, load on it and the recommended tire pressure at that load. Of the 21,800 you have, probably 12,000 is on the steer. When you put the 5th on it it will probably be at maximum load for the rear axle, so you will need to run the 110 psi. Jeff Beyer temporarily retired from Trailer Transit 2000 Freightliner Argosy Cabover 2008 Work and Play 34FK Homebase NW Indiana, no longer full time Link to comment Share on other sites More sharing options...
NeverEasy Posted October 11, 2017 Report Share Posted October 11, 2017 We had our Volvo and trailer weighed on the way into the National HDT Rally. I am singled short. Rear weight with the Smart loaded and no trailer: 5,250 lbs. With trailer: 7,425. Therefore, the weight either way does not even get to the minimum pressure/weight ratio on the chart of 70 p.s.i. for the duals. I found I should be running 105 in the steers and perhaps as low as 70 in the rear duals!. I have 95 psi crossfires on the rear so I will likely try the 70 before buying new crossfires. Chet & Deb '01 Volvo 660 w/ Smart '19 Forest River Columbus 320RS 5th wheel 2022 Chev 2500HD Long Bed Retired CWO4, USN and federal service Electronics Tech/Network Engineer/Welder/Machinist Link to comment Share on other sites More sharing options...
jeffw Posted October 11, 2017 Report Share Posted October 11, 2017 I went from 110 to 80psi in the rear (we are dual axle). It made a huge difference in ride comfort, especially over really bad bridge joints. I do have axle weights with the trailer on, and could run as low as 70PSI according to the tire manufacturer's charts but that seems really low so I haven't tried that yet. 2007 Volvo 780 Volvo D12D, 465hp, 1650 ft/lbs tq., ultrashift Link to comment Share on other sites More sharing options...
BlueLghtning Posted October 11, 2017 Report Share Posted October 11, 2017 5 minutes ago, NeverEasy said: We had our Volvo and trailer weighed on the way into the National HDT Rally. I am singled short. Rear weight with the Smart loaded and no trailer: 5,250 lbs. With trailer: 7,425. Therefore, the weight either way does not even get to the minimum pressure/weight ratio on the chart of 70 p.s.i. for the duals. I found I should be running 105 in the steers and perhaps as low as 70 in the rear duals!. I have 95 psi crossfires on the rear so I will likely try the 70 before buying new crossfires. That's interesting comparing to my weights. Is your front carrying a good bit of the weight? We are singled short (184" wb) with no bed and no smart. We did have a small dual sport motorcycle on the back, but it's 330lbs at most. I was 6,075 on the rear with just the truck (no bed or anything, just a rail to hold the motorcycle) and 10,650 on the rear with the trailer. Our pin weight is 3,725. My front was 10,825 with just the truck and 9,975 with the trailer, so off loading about 800# on the front. It seems strange my rear has more weight on it when I don't even have a bed or a smart, but maybe it's because I'm so short the rear is picking up more of the weight compared to the front? My total truck weight was 16,900 lbs bob tail. I was trying to figure out the pressure chart they gave me on the rear tires. When we chatted, they said I was off it on the low side. I'm looking at the column that says Dx2 and the lowest pressure is 70psi at 8190lbs and about 105psi at 10,880. How do you read this chart for the rear? Do you split your weight in half to find the correct one? I was thinking I should be at 105psi for the 10,880 wiht the trailer, but maybe not? Dan (Class of 2017) - 2012 Ram 3500 & 2005 Alpenlite Valhalla 29RK Contact me at rvsolarconsulting.com or Two Wheel Ramblin Link to comment Share on other sites More sharing options...
Steve from SoCal Posted October 11, 2017 Report Share Posted October 11, 2017 I have 24.5 tires and run them at 80 front 70 rear. Jeff beat me to the punch with both new tires on the same axle end. At lower pressure the scrubbing may not be as bad, the load radius at lower pressure may be more even? My truck weighs just under 10K on the steer axle and 3900 on the rear with no hitch, my small hitch and deck add about 800 pounds. The pin weight on my trailer is 4400 so all up 9100 on the back. The only down side to lower air pressure is a slight drop in MPG and increased heat from side wall flex, neither has been an issue At least with 24.5's 85 PSI is good for 10400, I see 22.5's are a bit lower 10300. Blue, The DX2 is dual rating, on many charts the listing show single and dual ratings. For example Bridgestone shows 295/75-22.5 tire at 70 PSI rated at 4500 single and 4095 in dual applications or 8190 per axle end or 16380 for a rear axle. Steve 2005 Peterbilt 387-112 Baby Cat 9 speed U-shift 1996/2016 remod Teton Royal Atlanta 1996 Kentucky 48 single drop stacker garage project Pulls like a train, sounds like a plane....faster than a Cheetah sniffin cocaine. Link to comment Share on other sites More sharing options...
mguay Posted October 11, 2017 Author Report Share Posted October 11, 2017 The reason I didn’t put the 2 new ones on the same side was that I was worried about having a taller tire on one side of the axle and having unequal torque on the spiders. I knew the new ones would wear quickly to a similar wear of the older ones. I’m going to load the Smart and hit the scale tonight for a front and rear weight. The 5er is set up in a tight spot at the CG for a couple more weeks but I know what the pin weight is. 3800# give or take. I’m thinking I’m going to leave the older ones at 110 and drop the new ones to 90psi or so. I’m worried that dropping them too much will cause the outer ribs to wear off rather than cleaning up the inner blocks. Link to comment Share on other sites More sharing options...
beyerjf Posted October 11, 2017 Report Share Posted October 11, 2017 As I heard a tire rep from a major manufacturer say to one of our {automobile} customers who came in with bad front end induced wear( inside of tire wearing faster- bad camber): "Rubber is ignorant. Even after you realigned the front end, the missing rubber is gone forever. That pattern will continue until the tire is worn out, which will occur first in the inside in this case. " Adjusting pressures, changing positions, etc whatever will not cause the irregular wear to change. If you do manage to get the footprint perfect on the pavement, the bad pattern, once set is nearly impossible to correct. Jeff Beyer temporarily retired from Trailer Transit 2000 Freightliner Argosy Cabover 2008 Work and Play 34FK Homebase NW Indiana, no longer full time Link to comment Share on other sites More sharing options...
mguay Posted October 11, 2017 Author Report Share Posted October 11, 2017 2 hours ago, beyerjf said: As I heard a tire rep from a major manufacturer say to one of our {automobile} customers who came in with bad front end induced wear( inside of tire wearing faster- bad camber): "Rubber is ignorant. Even after you realigned the front end, the missing rubber is gone forever. That pattern will continue until the tire is worn out, which will occur first in the inside in this case. " Adjusting pressures, changing positions, etc whatever will not cause the irregular wear to change. If you do manage to get the footprint perfect on the pavement, the bad pattern, once set is nearly impossible to correct. I’ve heard that before...but my fingers are still crossed! I farmed out the tires and the tire shop installed them as outers, then gave me the story about the torque on the spiders being less with them out there. After I wrote it and heard the words come out of my mouth, I was thinking...wow what a dumb @22! The spiders are there to compensate one side spinning faster in a turn and they have no idea if the truck is turning or going straight! Link to comment Share on other sites More sharing options...
NeverEasy Posted October 11, 2017 Report Share Posted October 11, 2017 Yep, sorry, I was misleading. I referenced the weight on each dual as it applied to the Load Table. Total rear axle weight, singled short is 10,600 w/o trailer. 15,125 w/ trailer. Front axle weight is 11,075 w/o trailer, 9,900 with trailer. Pin weight is 3,350. And I concur with the pucker factor running 70psi in the rear but it should soften the ride. I will run temp checks on the way home to see if there is a delta with 70 vs 95. Chet & Deb '01 Volvo 660 w/ Smart '19 Forest River Columbus 320RS 5th wheel 2022 Chev 2500HD Long Bed Retired CWO4, USN and federal service Electronics Tech/Network Engineer/Welder/Machinist Link to comment Share on other sites More sharing options...
brunsje Posted October 13, 2017 Report Share Posted October 13, 2017 Michelin tire rep told me to maintain at least 80psi for proper beading onto the rim. JohnnyB 2014 ShowHauler Motorhome 45' Jacksonville Beach, FL 32250 Link to comment Share on other sites More sharing options...
Jack Mayer Posted October 13, 2017 Report Share Posted October 13, 2017 You are not likely going to change the wear pattern on those tires to any significant degree at this point, no matter what you do. Jeff is spot on. I've seen it, I've experienced it myself, and I've talked to the tire manufacturer reps about it. That is the way it usually goes. So you should do whatever makes you feel best, at this point....and hope for the best. Jack & Danielle Mayer #60376 Lifetime Member Living on the road since 2000PLEASE no PM's. Email me. jackdanmayer AT gmail 2016 DRV Houston 44' 5er (we still have it) 2022 New Horizons 43' 5er 2016 Itasca 27N 28' motorhome 2019 Volvo 860, D13 455/1850, 236" wb, I-Shift, battery-based APU No truck at the moment - we use one of our demo units 2016 smart Passion, piggyback on the truck -------------------------------------------------------------------------See our website for info on New Horizons 5th wheels, HDTs as tow vehicles, communications on the road, and use of solar powerwww.jackdanmayer.com Principal in RVH Lifestyles. RVH-Lifestyles.com Link to comment Share on other sites More sharing options...
SuperHauler2000 Posted October 13, 2017 Report Share Posted October 13, 2017 With the amount of weight placed on the truck for recreational use only I put 100 PSI in the steer and drive tires and by them being all the same PSI it rolls and steers great. Grayling & Shirley 2000 Volvo 420, single Axle, 370 ISM, 10 speed 2001 Holiday Rambler Presidential 37' SKT US Army MSG (Ret) Transportation Corps (see You Tube Channel Max1Chase1) Link to comment Share on other sites More sharing options...
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