[Wichita-SCCA] Solo Trailer

[Rob Pickrell]

While most of the information on this link is correct, I have to take
exception with some of it.

Pasted below.

*	An "LT" designation on a trailer tire size specifies load range
only. It is not designed for use on light trucks. 
*	Do not mount "ST" or "LT" trailer tires on passenger cars or light
trucks. 

LT designation does stand for Light Truck Application, and just because it
happens to be in the same size as trailer sizes does not mean the tire is
not designed for light trucks. The LT does not specify the load range; the
LT does stand for Light Truck. That said most common trailer sizes are hard
to find anymore in LT designations. You common trailer sizes are
ST205/75R14, ST215/75R14, ST205/75R15, AND ST225/75R15, THERE ARE SOME
ST235/75R15, AND A NEW ONE IS ST235/80R16.

 

The load range is most commonly represented by the following examples: LR C
or LR 6 = a 6 ply rated tire (note that does not mean it has 6 plies in it,
and only the plies in the sidewall count for load carrying capacity); LR D
or LR 8 = 8 ply rated. If represented by a letter the formula to calculate
Ply Rating is, the number of the letter of the alphabet multiplied by 2, so
a LR C – C is the third letter of the alphabet – so 3 * 2 = 6 Ply Rated
Tire; and so on. A LR F = a 12 Ply Rated Tire. 

 

Tires are still rated based upon the strength of cotton. Most tires only
have two ply’s at most in the sidewall, some only have one (mono ply tires),
and a very few have three ply’s in the sidewall. As a manufacturer increases
the “Load Range” or “Load Rating” of a tire, they increase both the diameter
and tensile strength of the cords in the sidewall. As we move to commercial
and semi truck tires the material changes to steel. A 14 Ply rated semi
truck tire in most cases only has one ply in the sidewall, but it is a steel
cable. So what the Load Rating or Range means is: A Load Range C or a 6 Ply
Rated tires = the strength of 6 ply’s of cotton. 

 

Do not mount ST tires on passenger cars or light trucks. This is correct and
good advice. 

 

Do not mount LT tires on passenger cars or light truck does not make sense
and is done all the time. Less on passenger cars, but a LT tire is designed
for Light Truck applications. Most ½ ton trucks today come with either P =
Passenger rated tires or LTP = Light Truck tires but only 4 Ply rated like
most passenger tires. If you remove Passenger Tires from your ½ truck and
install Light Truck Tires, you should increase the recommended air pressure
by 3 PSI. So if you truck calls for 35 PSI and you put on LT tires raise the
minimum pressure to 38 PSI.

 

Many people and tire dealers have installed LT tires on passenger cars, this
is primarily for vehicles that travel lots of gravel roads to reduce flats.
Due to the stronger cords, and LT tire will reduce your flats by 60 – 80%.

 

Hope this helps.

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From: wichita-scca-bounces at wichitascca.org
[mailto:wichita-scca-bounces at wichitascca.org] On Behalf Of Tom Urbanek
Sent: Wednesday, March 07, 2007 7:33 AM
To: Wichita Region SCCA.
Subject: Re: [Wichita-SCCA] Solo Trailer

 

Here's some more good to know trailer tire facts:
 
http://www.discounttiredirect.com/direct/brochure/info/tmpInfoTrailerTireFac
ts.jsp
 
The life expectancy part is some what eye opening.  Maybe some kind of wood
tire cover should be made to help shade the tires while it's in storage.
 
--Tom

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Date: Wed, 7 Mar 2007 07:29:06 -0600
From: dgeis at cox.net
To: wichita-scca at wichitascca.org
Subject: Re: [Wichita-SCCA] Solo Trailer

Kevin Anderson wrote:



!! Note to whomever is towing the trailer to Raytheon !!
I checked the tires and all four are at 33psi.  Don't know what they should
be for the load and I do not have an air bubble.  Those big @$$ tires would
probably consume a few air bubbles anyway.  There is a new Kwik shop just
East of K15 on 63rd.



They need to be at the max pressure that's on the tires since it's just a
little bit overloaded ;-). 

-- 
Dave Geis
#25 SS - '07 Z-51
Wichita Region SCCA - http://www.wichitascca.org
<http://www.wichitascca.org/> 

 

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