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Old 06-21-2011, 09:32 AM   #1
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New Tire Question

Ok here is what I have. My TT ( GVRW 7,900) Has 2 Carlisle 225/75R15 (D) on passenger side, 2 Goodyear 225/75R15 (C) on driver side ( one of these is BAD possible broken belt ) , and the Spare is Goodyear 225/75R15 (D). So the past owner has three differant tires here. The manual calls for 205/75R15 (C).
Here was my first thought. I don't like the idea of running C's on one side and D's on the other. Seeing as one of the C's is a problem, was thinking of going with 2 new D's to have D's all around. Now if I did this would it be a good idea to put 1 new and 1 existing tire on each side? Also are the 225's a good fit in place of the 205's that came out on trailer from factory?
Thanks for any advice.
David
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Old 06-21-2011, 09:51 AM   #2
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How old are the tires? You may be better off replacing all.
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Old 06-21-2011, 10:03 AM   #3
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Quote:
Originally Posted by jmtandem View Post
How old are the tires? You may be better off replacing all.
I totally agree, not sure how old. Gonna be tough enough to pry 2 tires out of the wife, so better start there.
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Old 06-21-2011, 10:10 AM   #4
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Here is the bigger issue. If you blow a tire and it tears up the coach, the repair bills will likely be much higher than the price of tires. Many like the Maxxis as they seem to be reasonablly priced and wear well. My TT is two and a half years old and already had to replace all five tire valves (with metal ones) as they were rotten and one tire as it was cracking badly on the sidewall. They were the Goodyear Marathons.
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Old 06-21-2011, 10:22 AM   #5
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If the clearances are ok, stay with the 225s. I would always opt for D tires over Cs...
As to where to put the new ones--putting one on either side will work, maybe if one of the older ones go the newer one will hold up til you get stopped.

Joe
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Old 06-22-2011, 08:44 PM   #6
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Many 205/75-15 C tires come from the RV manufacture with 50 psi rated wheels. Not a good idea to run D tires on that wheel IF thats the case. Trailer tires need max pressure. Using 50 psi in a 65 psi rated tire isn't the best idea. The tire will flex more which creates heat/other issues.

A 225/75-15 tire needs a 6"-7" wide wheel. The 205/75-15 tire requires a 5.50" wide wheel. Mounting a wide 225 tire on a 5.5" wide wheel can cause the tires sidewall to extend out past the wheel (sidewall balloning)which leaves the tires sidewall suspect to rim cuts/road debree cuts/sway issues/etc.

Axle and tire manufactures warn owners to use the same size/type/tread design/brand on the same axle for several reasons. The most important is to have the same traction for braking performance on the same axle.

The tirerack.com has a excellent tire tech facts on this subject.
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