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Old 06-26-2020, 06:17 AM   #1
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Weight and pressure advice

We weighed our 2018 Ventana LE for the first time (CAT Scale) and the following numbers represent the recorded weights and coach placard ratings. A few other details: coach fully loaded and fueled with 1/2 tank of water, toad weight recorded @ 4,000 lb. The tire ratings call for 130front/120rear psi and I pressured to 125 front and 115 rear. Based on the numbers below, it appears we are within the weight parameters and have set the tire pressures accordingly. Please let me know if my assumptions and calculations seem reasonable and acceptable. Thanks

GAWR-FRONT 13,300
ACTUAL-FRONT 11,500
VARIANCE (1,800)

GAWR-REAR 20,000
ACTUAL-REAR 18,840
VARIANCE (1,160)

GVWR 31,400
ACTUAL TOTAL 30,340
VARIANCE (1,060)
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Old 06-26-2020, 06:23 AM   #2
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Size of your tires would help.
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Old 06-26-2020, 06:49 AM   #3
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Here is all the info you need to know about your coach and tires.

https://www.irv2.com/forums/f258/new...v2-201159.html
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Old 06-26-2020, 07:04 AM   #4
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Quote:
Originally Posted by jimnlo1949 View Post
We weighed our 2018 Ventana LE for the first time (CAT Scale) and the following numbers represent the recorded weights and coach placard ratings. A few other details: coach fully loaded and fueled with 1/2 tank of water, toad weight recorded @ 4,000 lb. The tire ratings call for 130front/120rear psi and I pressured to 125 front and 115 rear. Based on the numbers below, it appears we are within the weight parameters and have set the tire pressures accordingly. Please let me know if my assumptions and calculations seem reasonable and acceptable. Thanks

GAWR-FRONT 13,300
ACTUAL-FRONT 11,500
VARIANCE (1,800)

GAWR-REAR 20,000
ACTUAL-REAR 18,840
VARIANCE (1,160)

GVWR 31,400
ACTUAL TOTAL 30,340
VARIANCE (1,060)

Looks like the only thing you need is the pressure ratings for your particular brand & size of tire. Then you'll be able to determine the amount of pressure needed to support the weight on your tires.
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Old 06-26-2020, 07:06 AM   #5
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Go to tire manufacture web page and look up pressure chart for your tire. Inflate psi to what the chart states for you weight. Stan
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Old 06-26-2020, 10:56 AM   #6
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Thanks for the responses - you all validated my newbie assumptions since seeing a lot of back and forth, especially with the tire pressure thing.
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Old 06-27-2020, 08:01 AM   #7
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Here is an entire write-up from one tire manufacturer aimed at RV owners.

I suggest you find out what the tire manufacturer tells you to do, rather than users from the forum (despite how clever all of them really are).
Attached Files
File Type: pdf michelin.pdf (1.72 MB, 3 views)
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Old 06-27-2020, 08:16 AM   #8
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Without looking at numbers and knowing tire size my first reaction is the tire pressures seem high. Especially considering you are quite a bit under on both axles.
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Old 06-28-2020, 10:12 AM   #9
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Quote:
Originally Posted by jimnlo1949 View Post
We weighed our 2018 Ventana LE for the first time (CAT Scale) and the following numbers represent the recorded weights and coach placard ratings. A few other details: coach fully loaded and fueled with 1/2 tank of water, toad weight recorded @ 4,000 lb. The tire ratings call for 130front/120rear psi and I pressured to 125 front and 115 rear. Based on the numbers below, it appears we are within the weight parameters and have set the tire pressures accordingly. Please let me know if my assumptions and calculations seem reasonable and acceptable. Thanks

GAWR-FRONT 13,300
ACTUAL-FRONT 11,500
VARIANCE (1,800)

GAWR-REAR 20,000
ACTUAL-REAR 18,840
VARIANCE (1,160)

GVWR 31,400
ACTUAL TOTAL 30,340
VARIANCE (1,060)
The tire pressure rating on the sidewall of the tire is not telling you to inflate to that pressure ("calls for")- it is giving you the maximum cold pressure for the listed load. That has very little to do with your reality as long as you do not exceed the pressure of the load - that's a maximum cold pressure.
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Old 06-28-2020, 10:49 AM   #10
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Quote:
The tire ratings call for 130front/120rear psi and I pressured to 125 front and 115 rear.
Where is this "calls for"? If it's stamped on the tire sidewall, see & heed Domo's reply. If it's on the coach manufacturer tire placard by the driver seat, it's probably based on a coach at maximum load, which yours is not, and you can safely adjust downwards. Use the tire makers load-inflation table to determine the optimal psi.

The psi you stated sounds a bit high, but there is no way to tell without knowing the tire size and type. If the tires are relatively small for the coach size, they may indeed require high air pressure to carry the load.
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Old 06-28-2020, 08:46 PM   #11
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Originally Posted by Gordon Dewald View Post
Without looking at numbers and knowing tire size my first reaction is the tire pressures seem high. Especially considering you are quite a bit under on both axles.
Actually, front axle is only 1,800# under GAWR, rear is only 1,160# under GAWR.
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Old 06-28-2020, 09:37 PM   #12
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Definition of 'quite a bit' vs 'what is best' vs "what is correct" vs "Actually, only" ?
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Old 06-29-2020, 08:22 AM   #13
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Actually, front axle is only 1,800# under GAWR, rear is only 1,160# under GAWR.
1800 under on a 13300 axle is 13.5% and calculating a 130 lb tire pressure seems quite a bit. Back axle is less.
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Old 06-30-2020, 04:15 AM   #14
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Based on the Michelin chart and guidelines, I have cut back on the pressures accordingly. We will try to get another weight this week from another CAT location, just to have a calibration point. Thanks for the excellent advice from all.
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