Community Forums

djdobbins1 · 04-22-2014, 06:34 PM

Time to replace my six year old Continental tires. They are load range G. What load range did the 2004 40' MDTS come with? I am considering Firestone FS560 tires.

CutieFac · 04-22-2014, 07:37 PM

Look on the tag next to the drivers seat, or in that vicinity. It should tell you tire size, rating, and pressure when the coach was manufactured.

Old Scout · 04-22-2014, 07:49 PM

"H"

Mule Skinner · 04-22-2014, 09:24 PM

You will find different ratings on different brands. I decided to go with toyo's. They are H.
I think Goodyear and Michelin were G in the same size.

Tom and Patty · 04-22-2014, 09:30 PM

Just remember, if your coach came with "G" load range tires and you step up to "H's" air pressure remains the same. DO NOT decrease the air pressure.

Old Scout · 04-23-2014, 06:17 AM

OK--tires sizes and load rating are not directly related--example: Goodyear makes the 295 80r in both g and h ratings. Good starting point is to weight your coach with a typical travel load--by axle, but all 4 corners is best. "Think" all Alpines came with load range H required but lots of folks have dropped to g's--especially on the duals. Once you know your vehicle weights, you can make an informed decision about load capacity and safety margins.

Most tire companies publish load and pressure charts for each size tire. Generally speaking, g-rated tires top out at about 110 LBS, while H's go to 120 LBS. Accordingly, H's can/will carry more load at less pressure, when compared to g's. Interesting [to me anyway], most tire charts [for H's anyway] show pressures in the 100-105 lbs range for 13k front, single axles and 80-85 LBS for 20k rear, dual axles. These ranges seem low to me but I have also heard "old gray beards" at the local tire shop say: "100 in front--100 in back!!!!!" So opinions do vary.

TXiceman · 04-23-2014, 08:20 AM

Rather than Fire-Boom tires, I'd suggest you look at Bridgestone.

Ken

Tom and Patty · 04-23-2014, 08:24 AM

Scout,
In most cases a "G" and an "H" load range tire of the same size will carry the exact same weight. Take a look at a Bridgestone chart, or look at the capacity of the Michelin XZA3 Evertread chart. 11R22.5 carries 12,350 at 105psi for either the "G" or the "H".
So, in almost all cases, if you are running 100 up front on "G's", you will need 100 on "H's". Most all "G" are 6175 or 12,350 at max 105psi. "H" are 6610 or 13220 at max 120psi. These numbers are set by the RMA. When there are variations, they are most likely using European specs.

As Scout said. you must weigh the coach at all four corners to get accurate air pressure recommendations.
For our coach that means 95 up front (10,500 front axle gross) 80 in the rears.