Tire/Wheel Research

[colby]

While I was doing my winterization and check, I took note of the tire date codes on my 2018 212qb and tit turns out I have 2 at 4017 and 2 at 4117, so they are coming up to the 5 year mark next October. I know that I am looking a bit early; however, with Goodyear Endurance supply issues, I may have to make a decision sooner than later. Also, we have not put that many miles on the original tires (thanks to hip surgery a year ago and a torn Achilles this past summer), we will be using it more next year (I am determined...).

So with that, I am looking to potentially move up a size of tires, going from the stock 205/75R14s to potentially 225/75R15 to get from a D load range to an E load range. I am wondering if there is enough clearance for that wheel size. What size tires came on the 212QBW, were they 15's and is the trailer lifted higher with a different axle or something?

Has anyone done this, and if so what challenges did you have (if any)?

[curver900]

not sure it is worth the expense and time.
If you buy good tires keep track of them and don't overload the trailer your 14" tires will work fine. They have so far right?
I would just sit back and wait for a good set of 14" D rated goodyears come up for sale...

[PaulB12]

Look up " tire calculator " ( Google).
Just remember you're only talking half the total height difference when dealing with circles.
That is you find a tire to your liking and it is 2" taller, you're only going to see an inch closer to your wheel well.
Hope that helps, keep an eye on bolt pattern.
PaulB12

[Jay2504]

If the OPs tire size is 205/75/R14, (look on the sticker on the side of the unit), then the easiest thing to do is to keep the 14 inch wheels, and move up to 215/75R14. Only about a .6 inch height difference and IIRC, you pick up about 100 pounds of carrying capacity per tire. There are lots of owners of that model camper here, maybe someone will chime in with their tire size, to see if later models went to 15 inch wheels. Jay

[JFlightRisk]

Our 2012 Jay Flight 19RD is the same TT, just shortened by 2 feet, with a corner bed. We have 205/75 R15 tires. I'd have to measure, but I think the wheels have a 5 x 4/1/2 wheel stud pattern, if that helps.

[Jay2504]

Wow. A shorter camper with bigger wheels. I just looked up a 2022 212QB and the tire size is listed as ST 205/75/R14 according to the Jayco website. My unit, a 2020 24RBS, has ST205/75R15 tires in 5 lug wheels with a 5x4.5 lug nut pattern. Jay.

[colby]

Thanks all.

My bolt pattern is the 5x4.5". My personal issue is that I don't like the stock rims (plus they are rusting a little bit). I would like to get some nicer rims, so if I'm doing that, then the question becomes 14" or 15". In doing the research, I figured out that the 215/75R14s are rated just slightly more than the 205/75R15s (2200 vs. 2150) vs the 2040 that my 205/75R14s currently are.

Also, I'm thinking that the 15" tires will result in fewer revolutions per mile (almost 30 fewer revolutions for the 205/75R15 and almost 60 fewer for the 225/75R15)

What I have worked out is this, now to measure once the trailer comes out of winter storage:

• 205/75R14 (stock) - 26.1" in diameter
• 215/75R14 - 26.7" diameter - 0.3" each side which should not be an issue. Tire is 0.4" wider
• 205/75R15 - 27.1" in diameter - 0.5" each side. Tire is the same width
• 225/75R15 - 28.3" in diameter - 1.1" each side plus 0.8" wider

And for some visualizations:

[Jay2504]

Ok, now I get it. If going with 15” rims and tires, definitely stay with the 205/75/R15 size for both clearance reasons and it’s possible to have “too much tire” that would be so stiff that the camper will be beat to death on the road. One way to help with that is to lower the air pressure slightly based on Goodyear’s tire inflation chart. When you take measurements for the 15” wheels and tires,be sure to figure that the 2 tires will be 1 inch closer to each other between the axles. This may or may not cause problems with say “X” chocks. Jay

[Jagiven]

I considered putting larger tires & rims on my TT, I did a fair amount of research. In the end I only went up a load rating.

I contacted both Jayco and Dexter (axle provider). Here is what they both told me for my HTT.

Per Jayco customer Service:

• Clearance between the tire and the wheel well or other interference needs to be a minimum of 2.5"

Per Dexter Customer Service:

• Need to have a 3" minimum clearance above the tire to wheel well/interference, that is with a full load condition.
• Need to have a minimum of 1.5" clearance between the wheels on a tandem axle unit.

Lastly, keep an eye on the tire width too.