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Old 06-27-2008, 08:23 PM   #1
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C load range spare


just noticed my spare tire is a "C" load range with a max weight of 2150 while both tires on my 19 footer are "D" range with a max weight of 2450. my question is this, should i have to use the spare while traveling will i be able to "mix and match?" my trailer is about 4500 lbs wet. i could empty the fresh water if i needed to. all other weight is carried in the back of my truck.

does the board think i would be okay using a "c" and a "d" rate at the same time?



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Old 06-28-2008, 07:26 AM   #2
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The C-range tire will be close to maxing out with your weight, even considering the tongue weight but also considering the possibility of uneven side-to-side loading. If it were me, I'd keep the C as a spare-only...using it like you do the small doughnut spare in an, when needed to be installed as a spare, drive at slow speeds and short distances directly to the next flat-repair place.

Then, when I need to replace my tires, I'd buy three Ds.

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Old 06-28-2008, 08:36 AM   #3
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Load range C & D tires have the same dimensions, so your trailer should run o.k. with the spare. The C tire is overloaded so travel slowly to the next tire store. If your surviving D tire is three or more years old, I would consider replacing it as well and using your surviving D tire as a spare. In hot weather, the risk of blowout on the overloaded tire is increased.
I have had three blowouts in one year with D rated tires on my 25 foot Safari. Trailer tires of any make don't seem to be very well made and are prone to blowouts in hot weather.
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Old 06-28-2008, 08:53 AM   #4
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I wouldn't even use the C rated tire as a spare.

My 25FB (tandem axle) came with D's. We had three blowouts out west last summer. We replaced all our tires with Maxxis E's.

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Old 06-28-2008, 09:12 AM   #5
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Trash the c tire,my next set will be LT tires,I`ve left the tread of too many ST tires along the interstate. Dave
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Old 06-28-2008, 09:22 AM   #6
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Depending on where you are and what day you need to use the spare, limping along at slow speed may not be a great option. Here in the Southwest the next tire shop could be several hundred miles away and the chances of finding an open tire shop on a Sunday or holiday weekend are pretty slim. Having a spare that will let you continue your travel at a normal pace with no worries about load rating or handling characteristics would be worth the price of a new spare to me.


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Old 06-30-2008, 10:57 AM   #7
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Odd - my '97 25' Safari came with factory-spec'd C ranges - and says so on the tag. I'm surprised that David's 19 footer is maxing his tire.


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