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Old 01-13-2016, 02:10 PM   #15
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2015 23' International
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I converted our 2015 23D International Serenity from the stock GYM ST215/75R14C tires and wheels rated 1,870 pounds @ 50 psi and were 26.7" in diameter with 15" SenDel T03-56545T wheels and 15" Michelin LTX (P) 235/75R15 XL tires rated 2,183 pounds @ 50 psi but must be derated to 1,985 pounds for trailer use and are 28.9" in diameter. We run 44 psi tire pressure.
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TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell

2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels
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Old 01-14-2016, 06:47 AM   #16
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2014 31' Classic
2015 23' International
2013 25' FB International
Apache Junction , Arizona
Join Date: Sep 2012
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The reality of most car tires in more upmarket models are rated for speeds over 100 mph. Not too many places where that speed will not earn a "performance award" from the local sheriff/police.

The same goes for trailer tires. They may not be speed limited to 65 on the sidewall, but is it prudent to run 65 and faster when towing?

The majority of trailer owners are not driving their rig every day and thus lack the experience one acquires as a professional driver driving 100,000+ miles every year. The reality of faster speed is a minor incident can escalate instantly to a major problem and the speed makes stopping distances much longer and one's reaction times do not get quicker with age.

I decided over 45 years ago to drive only on Michelin tires. I had a tandem motorcycle trailer where the stock GYM tires earned the title "explodathons" so it too got Michelins.

In no case have two Michelin tires I installed on a trailer axle had less load rating than the trailer axle itself. That is a requirement of this regulation:

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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.

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.

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For safety reasons, I did the tire upgrade on our 2015 23D International Serenity from the stock 14" GYM ST215/75R14C tires rated 1,870 pounds at 50 psi to the 15" SenDel T03-56545T wheels and and 15" Michelin LTX (P) 235/75R15 XL tires sidewall rated 2,183 pounds @ 50 psi but per the regulation above derated to 1,985 pounds. As a result, I have a larger tire foot print on the road plus more load capacity safety margin.

Airstreams are considered recreation vehicles. So I slow down and enjoy the ride and scenery as well as the destination. I drive 55 (or the posted speed limit if lower) on most roads and around 60 t0 62 on the Interstates.
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TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell

2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels
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Old 01-14-2016, 03:19 PM   #17
Tom T
 
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Now that is usable & official DOT info from Switz!

It also points out that DOT is making adjustments to the max. load ratings for passenger & LT tires, which is based upon the info which I noted above regarding sidewall flexibility, etc.

Tire Rack has a pretty good informational tire tech library here & written for the average person:

http://www.airforums.com/forums/f238...ml#post1736312

These 2 on trailer tires discusses what folks are talking about on here for ST vs. LT tires on trailers, etc.:

Trailer Tires (ST) -
Tire Tech Information - Trailer Tires

Trailer (ST) vs Passenger Vehicle Tires (LT & P-XL) -
Tire Tech Information - Trailer Tires vs. Passenger Vehicle Tires
> NOTE - I see that this article runs contrary the the Federal statutes quoted above by switz, to down-rate BOTH LT & passenger tires' wt. capacity by 94% - the Law is correct, & Tire Rack needs to correct their write-up!

Also 3 helpful Trailer Life articles on tires here -

http://www.trailerlife.com/trailer-h...14764_12162015

http://www.trailerlife.com/trailer-h...r-tire-rating/

http://www.trailerlife.com/trailer-h...r-tire-trauma/


Thanx Switz!
Tom
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