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Old 06-19-2013, 01:09 PM   #1
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Moving up trailer wheel size?

I have a 2007 Jayco Jayfeather Sport 165

Wheel/tire size is 175/80 R13.

I was thinking of going up to 205/75 R14.

There seems to be enough room in the wells. I'm just wondering if going up in size will allow me to tow faster, or if there is something else I should be considering.

Thanks.
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Old 06-19-2013, 02:09 PM   #2
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I have wanted to do this also; but am not yet comfortable with wheel clearance issue. Every time I put on our "sun screen" cloth wheel covers I am reminded of how little space there is.

Has anyone with a Sport165 gone to the 14 inch wheel and found that it works?

I had not thought of the increase in speed you may be able to safely do. The issue for me is max load increase. And the axle may be more important than tire size for max load.
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Old 06-19-2013, 02:41 PM   #3
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Quote:
Originally Posted by jdavis92 View Post
I have a 2007 Jayco Jayfeather Sport 165

Wheel/tire size is 175/80 R13.

I was thinking of going up to 205/75 R14.

There seems to be enough room in the wells. I'm just wondering if going up in size will allow me to tow faster, or if there is something else I should be considering.

Thanks.
You will not be able to increase your speed. ST tires are rated up to 65MPH regardless of size. You will only reduce your total turns per mile since you will have added circumference.

If however you go to LT with increased load capacity your tire speed ratings do increase based on manufacturer specs. First you need to check your rim ratings and if the added pressure can be taken if you go up in load range to meet your weight requirements. LT's are rated for less weight than ST's in similar load ranges due to the softer sidewalls which is why you need to go up in rating. They also are not built to take the twisting that takes place in double axle configs which is not an issue in your case being a single axle.
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Old 06-19-2013, 04:24 PM   #4
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Towing at high speeds simply isn't a good idea.

As 3'senough pointed out, ST tires are 65MPH rated regardless of size.

As for LT tires, sure you can get higher speed ratings than ST...however I am not to sure if LT tires are made for 13" wheels, possible you could get one for 14" wheel but even that I doubt there would many options if any.

In CA the speedlimit while towing is 55mph, so the ST speed rating isn't an issue for me. I typcially find myself on the interstate running at 60-62, generally the same speed as the truckers.
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Old 06-19-2013, 04:57 PM   #5
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Yeah just did California from Needles to Guerneville and back.

I too stayed between 60 and 65 most of the way despite the 55 thing. Odd that most other western states don't have that restriction.

Here's my thought. At 60-65, my truck runs right at 2700RPM and I get 10MPG. If I could run at a slightly higher speed, say 65-70, and 3000RPM, I think I might get slightly better MPG and get to my destinations a little faster.

Edit: the other thing I am trying to "fix" is that my Sport 165 rides so low that the E2 WDH shank is not low enough to totally level out my rig. It's really darn close (probably close enough) but it would be nice to have everything REALLY level.....I'm weird like that.

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Old 06-19-2013, 05:22 PM   #6
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Needles to Guerneville is quite a tow. I'd say that 1300 mile round-trip tow though all types of terrain and traffic would tell you for certain if the WD hitch needs adjustments.

You are trying to accomplish a lot, here is what I would consider....

1) Only way to get speed rating you want it leave ST tires, focus on LT tires.
2) LT tires may be available in 14" but likely you will need 15" or larger -- will 15" fit?
3) Your orginal plan 175/80R13 to 205/75R14 is a overall 2" diameter increase, or 1" in actual height. Is 1" enough? If not, and you can fit 15" wheel/tire, that will get you closer to 1.75" in actual height increase.
4) Can you can flip the axle and stick with smaller wheels.

Beyond that I don't have any thoughts.

IMO, if the TT hieght is good, just not perfect I wouldn't go through changing wheels and tires just for additional height. Secondly, how much better is you MPG going to be, is it really enough to off set the cost you are considering? And don't forget the possible CHP ticket for running at 65-70
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Old 06-19-2013, 05:49 PM   #7
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Thanks clubhouse.

Yeah after 1700 miles I really don't think the WDH needs adjustment......maybe a little, but again I'm weird like that. Plus, I'm not an experienced tower. It could be that it does need adjustment and I just don't know it. It didn't feel as it we were bobbing all over the place and we encountered some fierce crosswinds that didn't put the TT all over the road either. Chances are, things are good.

Answers (or more questions):
1) I wonder if LT rated tires would "support" my trailer. It has a 3500 GVWR. I guess I would have to look into it.
2) 14" would fit, not sure about 15" unless I got lower profile tires. Although a wider 15" might not fit either.
3) 1" more effective diameter would probably level things out. I mean it really is close. I should have taken a photo of the entire rig while it was all hooked up.
4) I don't think flipping the axle on a Sport 165 is even possible. It's a Tor-Flex axle.

As far as increasing MPGs being "worth" it. I got 10MPG on my trip. $700 in gas. If I got 12MPG instead, gas would have been roughly $580. The new wheelset would be paid off around 4500 towing miles with that math. I think it's worth it.

Then again, maybe I'm just being picky.
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Old 06-19-2013, 06:08 PM   #8
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Best of luck, and yes LT = Light Truck, OEM on all 3/4 and 1 ton trucks. They will handle 3500 lbs TT GWR.
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Old 06-22-2013, 09:24 AM   #9
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Hi Jeff,
I never did try a 14" wheel on my trailer.
Height didn't seem to be a big deal. I had to slinky the hose a few times but no issues with driveways etc.
I thought I seen a post by our resident rig hauler and he reported getting the best MPG at 55?
Keep us posted if you get 14's fitted.

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Old 06-22-2013, 01:11 PM   #10
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Quote:
Originally Posted by jdavis92 View Post
Yeah just did California from Needles to Guerneville and back.

I too stayed between 60 and 65 most of the way despite the 55 thing. Odd that most other western states don't have that restriction.

Here's my thought. At 60-65, my truck runs right at 2700RPM and I get 10MPG. If I could run at a slightly higher speed, say 65-70, and 3000RPM, I think I might get slightly better MPG and get to my destinations a little faster.

Edit: the other thing I am trying to "fix" is that my Sport 165 rides so low that the E2 WDH shank is not low enough to totally level out my rig. It's really darn close (probably close enough) but it would be nice to have everything REALLY level.....I'm weird like that.

Jeff in Flagstaff
I'm not following why you think you would get better mileage. Drag increases exponentially with speed and my experience has been anything over 60 mph causes mileage to drop fast.
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