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Old 03-14-2016, 04:52 PM   #113
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Here's an update. I received from Acme 2 new size tires with rims to field test on the dolly. They are the ST145R12 10 Ply Radial tire mentioned in earlier posts. I have also add a TPMS I got from TST (Truck System Technologies) here in Georgia. So I will be keeping a log of mileage, temps (tire vs ambient), pressures and wear. I don't know if this will do anybody any good but it will keep me occupied.
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Old 03-14-2016, 05:11 PM   #114
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On my 2004 Kar Maddy SS the recommended pressure is 50 psi.
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Old 03-14-2016, 06:18 PM   #115
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Tires

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Originally Posted by c92vette View Post
Here's an update. I received from Acme 2 new size tires with rims to field test on the dolly. They are the ST145R12 10 Ply Radial tire mentioned in earlier posts. I have also add a TPMS I got from TST (Truck System Technologies) here in Georgia. So I will be keeping a log of mileage, temps (tire vs ambient), pressures and wear. I don't know if this will do anybody any good but it will keep me occupied.
What Brand?. Thanks
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Old 03-14-2016, 06:37 PM   #116
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Thanks for the update, will be interesting to see how things go. If they work out I may upgrade to a set with aluminum wheels.
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Old 03-18-2016, 07:40 PM   #117
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Now that I have the new tire / wheel assemblies in hand I needed to do some things before I mounted them. My next step I broke the bead of each tire assembly and installed steel valve stems to support the TPMS Sensor. Then I installed them on the dolly and aired the Left to 75 psi and the right to 90. I wanted to see how they set with the dolly loaded. Here's a couple of pics with the Edge up on the dolly.

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I'm curious what tires CWJK55 has on his Kar Kaddy SS. The towing / tracking principle is different from the EZ Tow dolly and his pressure seems low. This pressure may not be advisable for the EZ Tow dolly application. I didn't notice much sidewall flex between the two pressures but the higher pressure right tire seemed to sit a little higher as expected. I will run them both at 75 psi and monitor the temps. One thing I did notice right away was due to the tires being much narrower the brake calipers now stick out into the wind and may run cooler than before. (Refer to comment from vettenuts regarding brake heat)

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As you can see in the pictures the tires are Kenda Loadstar S Trails. They are rated a little less than the original tires but still in the Load Range E category. They fit the dolly very well. My next step will be to do some local towing behind my pickup to see how the tires work. If possible I will be able to get some video of my testing.
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Old 03-19-2016, 05:27 AM   #118
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c92vette, I got the same 12" tires from Acme and they are 80 PSI max.
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Old 03-19-2016, 05:42 AM   #119
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Aren't the new tires radials? Wondering if they will ride a bit softer due to the side wall flex compared to the original bias ply tires.

Thanks for the updates and photos. They look nice too
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Old 03-19-2016, 06:56 AM   #120
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The tires on the Kar Kaddy SS are Carlisle Trail PH 225/75/R15. They aren't original with the Dolly but we're on it when I purchased it used. The 50 psi is on the fender of the dolly itself. There is a sticker recommending that you keep the wheel nuts torqued to 120 pounds and maintain the tire pressure at 50 psi.
As long as I have a car on the dolly it tracks well. Towering with 50 psi with no load causes it to bounce and wander. Bringing it home after buying it we lowered the pressure to 35 psi so it would track better.
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Old 03-19-2016, 08:28 AM   #121
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They may be LR E tires, but they're of small circimfrence. My experience with small tires on small tow - behinds was that they'll wear out much quicker than even 13" tires. I suggest you switch, if you can, to a different tire mfgr. after the replacement tires fail.
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Old 06-28-2016, 08:10 AM   #122
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So Far So Good With the ACME ST145R12 10 Ply Radial Tires

1,500 miles and no issues so far. I have 75 psi cold in each tire and have noticed a 10-20 degree temperature rise within 30 minutes of travel and a rise of 8-13 psi. Highest pressure recorded so far has been 87 psi with a temp of 95. Coldest temp (where I set the cold pressure @ 75) was 57. This morning I noticed the pressure in one tire was @ 68 psi at 66 degrees. Temperature rise during braking has been negligible while the brake disc has been hot enough to burn skin.

While monitoring the tracking of the tires behind the coach I have noticed the tendency to slide sideways during a turn (60 - 90 degree turn) beginning to draw inside the turn radius and increasing the inward slide as the coach straightens at the end of the turn. It is this action in turns that I believe caused the previous tire to fail. These tires seem to roll the sidewall better allowing the tread to release from the road surface better.

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Notice how the gravel piles to the right from a right hand turn. This is caused by the dolly tire sliding inside the turn radius.

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This is the turn pattern of the LH dolly tire in a RH turn. Again notice the build up of gravel to the inside of the turn.

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This is the tread wear after 1,500 miles on the LH tire. If you look at the tread lines the center treads show a rounded edge on both sides while the outer treads are square on the inside and rounding further outside.

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This is the RH dolly tire tread wear but I cleaned the surface before I took the picture. The wear pattern looks symmetrical to both tires.

To sum up both tires seem to be holding the load well. Pressures and temps seem to be as expected. Tread wear pattern indicates the expected sliding in turns. I will still monitor the tires as we continue on our journey.
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Old 06-28-2016, 09:47 AM   #123
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Thanks for the update. I was going to send you a message and ask how they were holding up. On the other hand, I installed two brand new of the original tires prior to our spring trip (2,400 miles round trip). Both tires are cracked again between the treads.

Not sure where to proceed from here as I am nervous about a longer trip.
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Old 06-29-2016, 06:26 AM   #124
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Vettenut.... Have you considered trying our new tire and wheel? We have 40 sets in the field being tested and used , so far we are having very good results with them. Contact us at acmetowdolly@gmail.com to discuss it. Richard.
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Old 06-29-2016, 07:00 AM   #125
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It is called dry rot, replace them right away. Most likely due to old age and low humidity. Tire here in AZ always look like this after 4 years.
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Old 06-30-2016, 06:00 AM   #126
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It is called dry rot, replace them right away. Most likely due to old age and low humidity. Tire here in AZ always look like this after 4 years.
These were brand new tires so I doubt it was dry rot.
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