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Old 04-27-2016, 11:35 PM   #71
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Let me try uploading the pictures again. Sorry, I am new to this.
Ken
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Old 04-28-2016, 01:19 AM   #72
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Here is the regulation on derating passenger tires load capacity 10% for trailer use:

49 CFR 571.110
Tire selection and rims and motor home/recreation vehicle trailer load carrying capacity information for motor vehicles with a GVWR of 4,536 kilograms (10,000 pounds) or less.

S4.2.2.1
Except as provided in S4.2.2.2, the sum of the maximum load ratings of the tires fitted to an axle shall not be less than the GAWR of the axle system as specified on the vehicle's certification label required by 49 CFR part 567. If the certification label shows more than one GAWR for the axle system, the sum shall be not less than the GAWR corresponding to the size designation of the tires fitted to the axle.

Thus the use of the

S4.2.2.2
When passenger car tires are installed on an MPV, truck, bus, or trailer, each tire's load rating is reduced by dividing it by 1.10 before determining, under S4.2.2.1, the sum of the maximum load ratings of the tires fitted to an axle.

S4.2.2.3
(a) For vehicles, except trailers with no designated seating positions, equipped with passenger car tires, the vehicle normal load on the tire shall be no greater than 94 percent of the derated load rating at the vehicle manufacturer's recommended cold inflation pressure for that tire.
(b) For vehicles, except trailers with no designated seating positions, equipped with LT tires, the vehicle normal load on the tire shall be no greater than 94 percent of the load rating at the vehicle manufacturer's recommended cold inflation pressure for that tire.

Thus the use of the 15" Michelin LTX (P) 235/75R15 XL tires sidewall rated 2,183 pounds @ 50 psi is derated to 1,985 pounds for trailer use. The 28.9" diameter is 0.6" larger than the stock GYM ST225/75R15D with a 28.3" diameter. The Michelins have a larger tire contact patch, are not speed limited to 65mph and can be safely run at 44 psi as their maximum load capacity is attained at 41 psi.

The simple math shows 4 x 1985 = 7,940 pounds load capacity. Remember the tires are not carrying the GVW but just the trailer axle load. So our 25FB axle load fully filled and ready for camping was 5,800 pounds. with the total weight of just under 6,800 pounds. A 27 FB being only 300 pounds higher in GVW than a 25FB could also safely use these 15" tires since not all 300 pounds would be on the axles.

YMMV
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Old 04-28-2016, 04:02 AM   #73
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Thanks for the photos Ken. The new Sendel wheels look great IMO.

Peter



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Originally Posted by waldosgone View Post
Ken,

You wouldn't happen to have a picture with your new 16'' installed that you would mind posting? I'm going with the black accents because the silver wheels are backordered and I'd like to get them installed before we had back to Alaska. It's not a showstopper I'd just like see what they look like as we have similar trailers (mine is a 20FC).

Thanks,

James
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Let me try uploading the pictures again. Sorry, I am new to this.
Ken
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Old 04-28-2016, 01:15 PM   #74
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Thanks Peter,
I have done a lot of upgrades since we purchased in Oct. $KaChing$KaChing$.
Ken
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Old 04-28-2016, 07:04 PM   #75
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Thanks Peter,
I have done a lot of upgrades since we purchased in Oct. $KaChing$KaChing$.
Ken
Thanks for the pictures Ken, they look sharp! Excited to get them put on in a week or so; I know what you mean about $KaChing$... no one tells you about all the little bits and pieces. Of course we're doing this so we don't have to transfer between the house and FC20.

Thanks again!

James
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Old 04-29-2016, 02:33 AM   #76
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An Airstream and the associated expenses is a lot like giving blood. They don't take it all at once, but gradually over the years they can get a lot....
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Old 04-29-2016, 10:28 AM   #77
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Yes Switz, I figure 15% more $ in the first year alone.
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Old 04-29-2016, 11:31 AM   #78
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I think the dark accents in the wheels complement the dark windows in the trailer, looks great.
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Old 04-29-2016, 02:01 PM   #79
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As mentioned before, I upgraded the tires and wheels on the Bambi to 16" about eight years ago. I went with LT215/85R16E. The Bambi just rolls so much better.

When we took delivery of the 23FB, I replaced the 14" GYM with the 15" Sendels and LTX(P) 235/75R15 XL, but have always had it in the back of my mind if there was a way to go to 16" I even (briefly) considered changing out the axles.

The advice was that it is not a good idea to upsize more than 1".

However, the diameter of the LTX(P) 235/75R15 XL is 28.9" and the LT 225/75R16E is 29.2", a difference of 0.03. This seems negligible.

It seems like the 16" tires would fit, but as there is the concern commented on by switz that LRE may be too stiff. Couldn't this be mitigated lowering the PSI?

I am planning on installing the Dexter lift kit, which should add even more clearance.

I think the challenge will be finding a 16" 5-lug wheel, ideally with a 6" or 7" width. American Racing has one but it is 8" width. This may work but not sure.

I think I am slightly obsessed with trying to fit 16" tires and wheels on the 23", and continue to look for a way to do it. After my experience with the Michelin LT M/S 16" LRE tire on the Bambi, I think it is a significant upgrade.
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Old 04-29-2016, 02:29 PM   #80
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Try etrailer, they have a huge selection if wheels. Might have one the size you need.
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Old 04-30-2016, 12:32 AM   #81
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Change the brake drums to 12" from 10" and the bonus is moving from 5 lug to 6 lug wheels. While doing that, make sure to get the auto-adjusting brake model. The oversized drums will work a little less harder stopping the lighter 23' models than the larger units.

I find I have more than enough braking capacity even with the 15" tires and wheels on the 10" drums. Andy at CanAm had a different suggestion on the brake settings for the Tekonsha Prodigy RF system than one would normally use .
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Old 04-11-2017, 09:04 PM   #82
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air pressure for 16" wheels

Hi, quick question. We made the switch to michelin 225/75/16 wheels (m/s) on our FC20. We are very excited to benefit from the stability others have mentioned. What tire pressure are people using for these tires? They are rated up to 85. Our shop started with 65... but I want to get it right before we start on our adventures..

-Charles
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Old 04-12-2017, 03:23 AM   #83
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In December of 2013, we ordered five of the Michelin LT225/75R16/E LTX M/S2 tires rated 2,680 pounds @ 80 psi that are 29.2" in diameter and were Michelin P/N 05681 and cost $1,187.69 at CostCo. They were mounted on the T03-66655T SenDel wheels the Airstream factory uses and sells.

Our 2014 31' Classic scale numbers on May 2014

……….1200 ———————1200

2034…………..2042 ——— 4076

1921…………..2062 ——— 3983

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The tire load tables are below. Since I know the exact wheel load for each tire, I needed a 2,500 load capacity which would be 72.5 psi.

80psi 2,680 (E)
75psi 2,560
70psi 2,440
65psi 2,335 (D)
60psi 2,190
55psi 2,060
50psi 1,940 (C)
45psi 1,790

We run 73 to 75 psi cold.
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Old 04-12-2017, 06:15 AM   #84
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Quote:
Originally Posted by cedonly View Post
Hi, quick question. We made the switch to michelin 225/75/16 wheels (m/s) on our FC20. We are very excited to benefit from the stability others have mentioned. What tire pressure are people using for these tires? They are rated up to 85. Our shop started with 65... but I want to get it right before we start on our adventures..

-Charles
I have run these tires on four Airstreams, 25' and three 30' at about 74 psi. So far never an issue.
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