Tire size mismatch question

matt167

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Sep 27, 2012
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No Tire is perfectly Round, perfectly Balanced, or is equally Flexible its entire Circumference
Many quality passenger tires end up not needing any weight and have a very small amount of runout if any. Yes any tire will flex. There is a large amount of runout with any trailer tire
 

Stinnett21

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Jun 24, 2012
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Just replaced two Goodyear Marathons 10 years old. Boat is stored in indoors though.
 

ESGWheel

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Aug 29, 2015
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Once you put a few on a balancer you understand. It is literally a waste of time....But it’s not going to fix the runout.
While my experience is decades old, I have balanced 100s of tires, including for trailers. I do not recall ever noticing a new tire runout so extreme it would cause me pause. Tires with mileage on them yes (and was due to a failed internal belt or extreme ware), and then I would suggest to the customer to buy new. On my tow behind RV and boat trailer I have replaced their tires a few times and generally chat up with the guys in the shop doing the work. While I did not specifically ask about runout, their general attitude (experienced guys, not the kids) was to also balance the trailer tires. I have only used Carlisle and Maxxis tires with excellent results.
 

Elkins45

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Dec 9, 2010
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Fun fact: in the year since I bought them the 14” Goodyear Endurance tires have increased from $118 to $160.
 

matt167

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While my experience is decades old, I have balanced 100s of tires, including for trailers. I do not recall ever noticing a new tire runout so extreme it would cause me pause. Tires with mileage on them yes (and was due to a failed internal belt or extreme ware), and then I would suggest to the customer to buy new. On my tow behind RV and boat trailer I have replaced their tires a few times and generally chat up with the guys in the shop doing the work. While I did not specifically ask about runout, their general attitude (experienced guys, not the kids) was to also balance the trailer tires. I have only used Carlisle and Maxxis tires with excellent results.
I’ve been doing this myself for the last 10 years. My boss has been doing it since 1993, he has had his shop since 2013 but I wasn’t with him when he opened.. we have absorbed work by word of mouth for hundreds of miles. I just put tires on a 4 car stacker yesterday. The shop I worked at before, we slapped a weight on anything. Whatever the machine said, unless it was chasing, that’s all you did. My current boss is always preaching to “ look at the tires “ meaning on the balancer. Once you pay attention, it becomes evident what you’re looking for. If tires are too far out, we order another tire and have the person come back if we don’t have another in stock. We then send the bad tire back to the distributor as a quality defect or ride complaint.. any trailer tire just has too much runout. A common 15” trailer tire will probably have 1/2” of runout and take 3-4 ounces of weight… we sell Goodyear endurance and Hankook Vantra trailer tires. 2 of the best that are available, and the inventory is always fresh as we sell a lot of trailer tires
 

ESGWheel

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Once you pay attention, it becomes evident what you’re looking for. If tires are too far out, we order another tire and have the person come back if we don’t have another in stock.
matt:
The OP took issue with the current quality of tires, I am curious of what your assessment is over these last couple of decades regarding overall tire quality. I would have thought the overall quality would have increased for all sizes.

Also, it seems you are suggesting that you should always balance trailer tires, if for nothing else other then to look for the ones with too much runout. Given that shops do not let you observe anymore, I am thinking my new process for all tires, including trailers, will be to tell the sales guy: “If it takes more than X ounces to balance the tire, I do not want it, please change it out with another.” Do you think this is a good idea? How would your shop respond to such a customer request?
 

matt167

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matt:
The OP took issue with the current quality of tires, I am curious of what your assessment is over these last couple of decades regarding overall tire quality. I would have thought the overall quality would have increased for all sizes.

Also, it seems you are suggesting that you should always balance trailer tires, if for nothing else other then to look for the ones with too much runout. Given that shops do not let you observe anymore, I am thinking my new process for all tires, including trailers, will be to tell the sales guy: “If it takes more than X ounces to balance the tire, I do not want it, please change it out with another.” Do you think this is a good idea? How would your shop respond to such a customer request?
My shop won’t sell a tire that has too much runout. The actual amount of Weight does not matter, to a point. If it’s not right, we re order a tire if it’s not in stock… but as to trailer tires. You can try to balance them, but generally will take so much weight and have so much runout that, weights start chasing anyway.. this is where balancing compound would come into play, if it were required. If someone asks for balancing a trailer tire, we don’t turn it down. I don’t think tire quality has gone down. But balancing technology has gone up. So defects are more noticeable. We use a high speed Hunter balancer that is reported to spin 60 mph.
 

jimmbo

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May 24, 2004
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13,446
60 mph on a Tire that is 26" in diameter is about 777 rpm, just slightly more than the Idling Speed of a lot of Engines
 

matt167

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Sep 27, 2012
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60 mph on a Tire that is 26" in diameter is about 777 rpm, just slightly more than the Idling Speed of a lot of Engines
But it’s relatively twice as fast as a normal run of the mill wheel balancer. It’s a Hunter Smart weight. They don’t need to spin at road speed. But the faster they spin, the higher accuracy they have
 

ESGWheel

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Aug 29, 2015
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Should I spend more money for a third 14” wheel and tire or am I overthinking this? Or should I just carry all three of the old 13” tires with me as a backup LOL?
@Elkins45
Lots of suggestions above. Curious of what did you decided to do and why. Can you tell us?
Thanks!
 

airshot

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Joined
Jul 22, 2008
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5,081
Simple...mount your tire on your spindle, set bearing to proper tension. Now with the axle on a jack rotate your tire and see if it runs out. If it is noticible, time to replace the tire, no way will a balancer correct this.
 

matt167

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Sep 27, 2012
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Still deciding, but I’m keeping an eye out for a good used 14” wheel.
Any tire shop can get a bare 14” wheel for very little money. I don’t know the current cost but last year we were selling them for like $35 or something. Pair that with something like a Triangle tire and you have peace of mind for very little money
 
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