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12-11-2013, 04:05 PM
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#1
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Senior Member
Join Date: Feb 2013
Location: Tampa, FL
Posts: 543
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Tire size for Rockwood Signature Ultralite 8315BSS?
My folks have a Signature Ultra Lite 8315BSS with a special request for tire covers for Christmas.
How in the world do I find out what size tires they have? 
__________________
~ Darlene ~
2014 Coachmen Mirada 35BH
previous owner of
2014 Rockwood Mini-Lite 2306
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12-11-2013, 04:07 PM
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#2
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,891
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It's written on the side of the tire- but I'm assuming that actually inspecting the tires is out of the question....
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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12-11-2013, 04:08 PM
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#3
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Senior Member
Join Date: Feb 2013
Location: Tampa, FL
Posts: 543
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Yeah, it's about 1,000 miles from me presumably buried in snow.
__________________
~ Darlene ~
2014 Coachmen Mirada 35BH
previous owner of
2014 Rockwood Mini-Lite 2306
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12-11-2013, 04:09 PM
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#4
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,891
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Heh. Ok, so let me just sulk away and hope someone else comes along.
I'm going to edit your thread title to include the model. Hopefully someone with the same camper comes along with an answer.
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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12-11-2013, 04:10 PM
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#5
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Senior Member
Join Date: Feb 2013
Location: Tampa, FL
Posts: 543
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Great, thank you. That is my hope!
And now they just need to not read the forum for a few days.... LOL.
__________________
~ Darlene ~
2014 Coachmen Mirada 35BH
previous owner of
2014 Rockwood Mini-Lite 2306
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12-11-2013, 04:17 PM
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#6
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Senior Member
Join Date: Feb 2012
Location: Clarksville Va.
Posts: 10,422
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Rockwood ultra lights come with 15" tires, I'm almost a 100% sure. If they do not fit they can exchange them. I just looked them up they are 15" unless they changed them. Nice present for them. 225/75R15
__________________
Coachmen M/H
Concord
2018 / 300 DSC
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12-11-2013, 04:22 PM
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#7
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Site Team
Join Date: Nov 2010
Location: Northeast Louisiana
Posts: 33,960
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That trailer is similar in weight and length to my Flagstaff.
FYI, Flagstaffs and Rockwoods are sister lines that are produced in the same factory.
My Flagstaff 831RLBSS has ST225/75R15 tires on it...........and your parents may have the same.
__________________
 2011 Flagstaff 831 RLBSS
A 72 hour hold in a psych unit is beginning to intrigue me as a potential vacation opportunity.
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12-11-2013, 04:30 PM
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#8
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Senior Member
Join Date: Feb 2013
Location: Tampa, FL
Posts: 543
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__________________
~ Darlene ~
2014 Coachmen Mirada 35BH
previous owner of
2014 Rockwood Mini-Lite 2306
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12-11-2013, 04:44 PM
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#9
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Site Team
Join Date: Nov 2010
Location: Northeast Louisiana
Posts: 33,960
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Quote:
Originally Posted by dkb74
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If they are 15 inch tires, they may be a little small for those covers.....but the covers would definitely go over them with room to spare.
The way to approximate a tire size total diameter (I only do it a 100 times a week) is to take the section width multiplied by aspect ratio, multiplied by 2. You then take this product and divide it by 2540 (since the section width is in millimeters, we need to convert to inches and there are 25.4 mm's to an inch). You then take this number and add it back to the rim diameter to get approximate total tire/wheel diameter in inches.
Confused? Let's simplify it for our tire size of 225/75R15
225 (section width) X 75 (aspect ratio) X 2 = 33750
33750 divided by 2540 = 13.29 inches (we multiplied it by 2 above to get both sidewalls heights)
13.29 + 15 (rim diameter inches) = 28.29 inches approximate total tire diameter
It's an approximation, but is usually very close.
I find it easier to use whole numbers in the multiplying and dividing, but we could have actually used 225 X .75 and then divided by 25.4. I find it a lot easier to move the decimal places and use whole numbers (like 2540). Less room for data entry error.
or you can look at the spec charts, like for the Goodyear Marathon.
http://www.tirerack.com/tires/tires....arathon+Radial
__________________
2011 Flagstaff 831 RLBSS
A 72 hour hold in a psych unit is beginning to intrigue me as a potential vacation opportunity.
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12-11-2013, 04:49 PM
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#10
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Senior Member
Join Date: Feb 2013
Location: Tampa, FL
Posts: 543
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Dude, I may be an engineer, but that doesn't mean I know tires! I know how to build bridges! LOL.
Thank you. 
__________________
~ Darlene ~
2014 Coachmen Mirada 35BH
previous owner of
2014 Rockwood Mini-Lite 2306
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12-11-2013, 04:58 PM
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#11
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,891
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Holycraperal, wmtire geeked out on us! Seems like there should be a simple online calculator for that...
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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12-11-2013, 05:04 PM
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#12
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Site Team
Join Date: Nov 2010
Location: Northeast Louisiana
Posts: 33,960
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Quote:
Originally Posted by ependydad
Holycraperal, wmtire geeked out on us! Seems like there should be a simple online calculator for that... |
There are plenty, but you may not always be in front of a computer. Once you get the formula down (it's easy, which is why I explained it in detail), you can do it a lot faster than you can go to a website and enter the numbers.
I can do it on our adding machine in about 5 seconds.
It's a real hit with the ladies at the nightclubs. LOL
__________________
2011 Flagstaff 831 RLBSS
A 72 hour hold in a psych unit is beginning to intrigue me as a potential vacation opportunity.
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12-11-2013, 05:06 PM
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#13
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,891
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Quote:
Originally Posted by wmtire
There are plenty, but you may not always be in front of a computer. Once you get the formula down (it's easy, which is why I explained it in detail), you can do it a lot faster than you can go to a website and enter the numbers.
I can do it on our adding machine in about 5 seconds.
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Makes sense.
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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12-11-2013, 05:09 PM
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#14
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Senior Member
Join Date: Feb 2013
Location: Tampa, FL
Posts: 543
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Quote:
Originally Posted by wmtire
There are plenty, but you may not always be in front of a computer. Once you get the formula down (it's easy, which is why I explained it in detail), you can do it a lot faster than you can go to a website and enter the numbers.
I can do it on our adding machine in about 5 seconds.
It's a real hit with the ladies at the nightclubs. LOL
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Ha!
__________________
~ Darlene ~
2014 Coachmen Mirada 35BH
previous owner of
2014 Rockwood Mini-Lite 2306
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