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Old 05-12-2013, 10:36 AM   #1
Beercan
 
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Question Tire ratings and nitro filling

Hi all, I am a new user on this site and also a relatively new RVer. I have a couple questions about my 2012 27 foot BKHS. I am wondering what the D means in the tire size, ST205/75D14. I need to purchase a new wheel and tire for a spare as I guess these travel trailers don't come with a spare. I purchased this from a person that purchased it last year. Before I buy a spare I would like to know if these tires are bias or radial and if not radial should I just replace them all with radials. If I decide to keep these original tires should I just deflate the tires and replace the nitro with air. Thanks for any information you can give me as I know there must be many very experienced RVs here. Thanks again, Beercan
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Old 05-12-2013, 10:48 AM   #2
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Welcome to the forum!

We don't really know which RV you have. Please update your profile to include that information.

The "D" is probably the load rating of the tire. The "ST" indicates that they are special trailer tires. That's all you need to know re radial/bias. Buy one of those.

There was a thread on here recently regarding nitrogen-filled tires. The consensus was that its a hoax. No need to deflate them however. Just add air (~80% nitrogen) as needed.
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Old 05-12-2013, 01:32 PM   #3
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Thanks BarryD0706, I found out the D stands for Bias ply tires. I just removed one from thr RV and noticed these tires are already weather checked on the inside and only a year old. That shows me the tires are no good so I will be replacing them all with radials before I travel far. As for the nitrogen, a hoax period. Thanks for the info. Beercan
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Old 05-12-2013, 01:44 PM   #4
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They are not bias ply. The D refers to the load rating of the tire which is posted on the tire and on the side of the camper near the passenger front. Max pressure is 65 lbs.

Your unit came with a spare, I think. Unless it was removed.
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Old 05-12-2013, 02:22 PM   #5
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If the tire size reads "ST205/75D14" then it is indeed a bias tire. The D stands for diagonal bias. Don't bother filling the tires with nitrogen, good old fashioned air is fine. The only advantage I have seen with nitrogen filled tires is they don't seem to lose air pressure the way air-filled tires do.
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Old 05-12-2013, 02:27 PM   #6
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Yes they are bias ply tires. Google tire tire size and ratings. The load rating on these tires is C 6 ply St205/75D14, if they were radial there would be an R after the 75 not D I just talked to the original owner and according to him this camper did not come with a spare tire. Thanks
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Old 05-12-2013, 05:44 PM   #7
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Just a suggestion, it could be bolted to the bottom of the frame.
My old TT came with nitrogen filled tires. Always ignored that an just used air. Never a problem. Now as far as brand, search the forum for tires. I bet it has been discussed.
While you are putting on tires, have the wheel bearings checked.
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Old 05-14-2013, 08:05 PM   #8
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the advantage to nitrogen is it won't increase in pressure as the tire heats rolling down the road. Nito is used in some motor racing these days. Is it needed ? not really.. just keep in mind a loaded trailer tire is gonna increase 3-5psi when it gets hot rolling down the highway.
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Old 05-14-2013, 08:17 PM   #9
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Quote:
Originally Posted by melk-man View Post
the advantage to nitrogen is it won't increase in pressure as the tire heats rolling down the road. Nito is used in some motor racing these days. Is it needed ? not really.. just keep in mind a loaded trailer tire is gonna increase 3-5psi when it gets hot rolling down the highway.
Yes it will. Any gas will increase in pressure when it gets hotter. A normal trailer tire will increase almost 10psi when it gets hot. That large amount is probably due to the moisture that was in the air fill. (A nitrogen fill may have less moisture so may have less of a pressure increase.)
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Old 05-14-2013, 08:42 PM   #10
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Yes it will. Any gas will increase in pressure when it gets hotter. A normal trailer tire will increase almost 10psi when it gets hot. That large amount is probably due to the moisture that was in the air fill. (A nitrogen fill may have less moisture so may have less of a pressure increase.)

check your tire increases next time out, highly doubt you are seeing a 10psi increase in pressures even loaded close to max tire capacity. It also (as some stated above) won't leak down as fast as tires filled with o2. (a benefit for those less than religious about checking before every trip !)

And i would respectfully disagree, nitro doesn't expand close to the rate/amount that o2 does. Even our roadrace motorcycle tires that deflect in shape a good amount, and reach surface temps of 200+F (with inner temps of 290+) only increase about 5-6psi if we have the correct compound, and 8-9 if we have way too soft a compund that is literally getting "greasy" at the end of a session.
lots of info out there on this. i should have perhaps amended my post to say ".. not as much as o2".. on of many articles out there doing a quick goodle search
Nitrogen vs Air In Tires - Why Nitrogen in Tires - Popular Mechanics
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