tires

Keithk3628 wrote:
What might these tires be on, those sizes are definitely not a class A

I usually just run 80 psi in mine, thats what my sidewalls say

These are on a class A 1996 Georgie Boy Cruise Master F53 Chassis. Inside placard:
Front GAWR 6000 GVWR 17000
80psi
Rear 11000
80psi
LT235/85R16E

Rims 16x6x

grmps1 wrote:
Hi, New to rv's. Just purchased a used one and was curious about the
tires. They are LT235/85R16E Cooper and sidewall says 80psi max.
I read the data plate on the steering column and it also has same size
and pressure listed. but all 6 tires are at 70 psi cold. is this normal or is there a reason for the lower pressure?
Thanks

We have a 31' Class C that weighs right at 14000 lbs. loaded so we carry 80 lbs. in the duals and 75 in the front. The Escapees have a program to weigh all 4 corners with several locations around the country plus most of their Escapades have mobile scales available. Check HERE to see if they are located anywhere near. Cost is around 40-50 dollars. We use it every year before Summer trip.

Dave

What might these tires be on, those sizes are definitely not a class A

I usually just run 80 psi in mine, thats what my sidewalls say

Inside the RV you should have a placard stating the pressure to use. If you find the ride too harsh weigh the unit as loaded for travel and adjust based on tire chart. Some will disagree, but ignore what is on the tire as it is simply the MINIMUM pressure required to support the MAXIMUM weight the tire can support and for 99% of situations a meaningless number.

Put two new on the front and keep the best one as a spare...you may need it.

LT rires should be able to go 6 to 7 years easily. Cupping could be a sign of bad shocks or worn front end components. I would get two new tires and have a qualified heavy duty alignment shop go through the front end. Pressure? Get all 4 corners weighed and adjust air pressure according to weight/ chart.

Thanks for quick reply the date on tire 1513 so i guess they 5 yrs old
was gonna just replace front due to slight cupping on outside tread but
looks like all 6 may need replaced

The data plate is likely suggested pressure at GVWR fully loaded weight, actual optimal tire pressure may be lower than this if you are not at weight capacity when traveling. The tire max capacity may exceed the max load carrying capacity of the axle.

Using For example, you may have an axle rated to carry 6000 pounds, with tires that are rated at 3,080 pounds per tire at 75psi, 3250 pounds per tire at 80 psi, etc. and a max capacity of 100 psi. In this situation the limiting factor is the axle, any pressure over 75 psi just makes the ride stiffer, and the middle of the tire wear out faster. (f course if when you are loaded you are only carrying 5400 pounds on that axle, the proper pressure may be 65 psi....

The way to find out correct pressure for your coach is to get 4 corner weights with it loaded for travel, then consult the tire manufactuers load pressure chart like this one http://www.rvtirepressure.com/assets/images/extrapages/michelin_rv_load_inflation.pdf.

It could be the tire pressure charts indicated that psi for the weight of the MH. Get it weighed after you load it. 4 corner weigh is best(hard to find) so at least do each axle. You didn't mention the age of the tires(from the sidewalls). If the age is 5-7+ years old, buy new tires. Tires on RVs don't wear out, they age out.